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WO2010029572A1 - Procédé de fabrication de feuilles d’alliage d’aluminium - Google Patents

Procédé de fabrication de feuilles d’alliage d’aluminium Download PDF

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Publication number
WO2010029572A1
WO2010029572A1 PCT/IN2009/000436 IN2009000436W WO2010029572A1 WO 2010029572 A1 WO2010029572 A1 WO 2010029572A1 IN 2009000436 W IN2009000436 W IN 2009000436W WO 2010029572 A1 WO2010029572 A1 WO 2010029572A1
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WO
WIPO (PCT)
Prior art keywords
alloy
range
temperature
billets
room temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IN2009/000436
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English (en)
Inventor
Vadlamani Subramanya Sarma
Vivek Srivastava
V. L. Niranjani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aditya Birla Science and Technology Co Ltd
Indian Institute of Technology Madras
Original Assignee
Aditya Birla Science and Technology Co Ltd
Indian Institute of Technology Madras
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aditya Birla Science and Technology Co Ltd, Indian Institute of Technology Madras filed Critical Aditya Birla Science and Technology Co Ltd
Publication of WO2010029572A1 publication Critical patent/WO2010029572A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working

Definitions

  • the invention relates to a method for manufacture of a high-strength aluminium alloy and to the alloy manufactured thereof.
  • the invention also relates to articles and products shape formed from the alloy.
  • Aluminium alloys are widely used in various engineering structures. Owing to the advantageous features such as light weight and corrosion resistance, they are extensively used in the manufacture of automotive and aircraft bodies. They are also used in ship building and in the manufacture of roofing sheets. Aluminium alloys are classified respectively into cast alloys and wrought alloys depending on whether they are molded or deformed into the desired shape. Rolling, forging and extrusion are the various methods conventionally used to deform aluminium alloys. Deformation introduces strain and improves strength and, therefore, wrought alloys generally have higher strength.
  • wrought aluminium alloys are identified by a four- digit series. 2000 series and 7000 series wrought aluminium alloys have the highest attainable specific strength, but they are usually expensive or their manufacture require sophisticated machinery. 6000 series aluminium are relatively less expensive and are easy to manufacture. However, their strength, attainable by conventional methods, is relatively less.
  • High strength aluminum alloys could be obtained by severe plastic deformation and/or by cryogenic rolling. However, such methods are either not scalable and/or are very expensive.
  • US 6562155 discloses a method for producing aluminium alloy where working strain is introduced into aluminium alloy by flask-assisted cold forging.
  • US 4186034 discloses a method for manufacture of aluminium alloy sheets by following a sequence of steps including casting of aluminium alloy melt, hot rolling the alloy, cold rolling of hot rolled alloy and annealing the cold rolled alloy above recrystallization temperature.
  • the improvement in strengths by conventional methods are limited. There is scope for further improvement in aluminium alloy strengths.
  • An object of the invention is to provide a method of manufacture of high strength aluminium alloys.
  • Another object of the invention is to provide aluminium alloys having high hardness and strength
  • a further object of the invention is to provide articles and products prepared from high strength aluminium alloys Summary of the invention
  • the present invention realizes the above mentioned objects through a method for manufacture of high strength aluminium alloys.
  • the method of the invention enables manufacture of high strength alloys from billets of aluminium alloys.
  • the invention provides a method for manufacture of a high-strength aluminium alloy from cast alloy billets.
  • the invention provides a method for manufacture of a high-strength aluminium alloy, the method comprising heating billets of cast alloy containing aluminium and alloying elements at a temperature in the range of 450 0 C to 550 C to homogenize the alloy, deforming the billets in the homogenized state to form a hot worked alloy, first allowing the hot worked alloy to cool to room temperature and then heating the hot worked alloy from room temperature to a temperature at which the alloy forms a solid solution, quenching the solid solution in water, deforming the quenched alloy at room temperature to form a cold worked alloy and aging the cold worked alloy at a temperature in the range of 50 to 150 0 C.
  • the invention provides a method for manufacture of a high- strength aluminium alloy, the method comprising heating billets of cast alloy containing aluminium and alloying elements at a temperature in the range of 450 0 C to 550 0 C to homogenize the alloy, deforming the billets in the homogenized state to form a hot worked alloy, first allowing the hot worked alloy to cool to room temperature and then heating the hot worked alloy from room temperature to a temperature at which the alloy forms a solid solution, quenching the solid solution in water, deforming the quenched alloy at room temperature to form a cold worked alloy and aging the cold worked alloy at a temperature in the range of 50 to 150 0 C, wherein the alloying elements are selected from a group consisting of silicon, magnesium, copper and zinc.
  • the invention provides a method for manufacture of a high- strength aluminium alloy, the method comprising heating billets of cast alloy containing aluminium and alloying elements at a temperature in the range of 450 0 C to 550 0 C to homogenize the alloy, deforming the billets in the homogenized state to form a hot worked alloy, first allowing the hot worked alloy to cool to room temperature and then heating the hot worked alloy from room temperature to a temperature at which the alloy forms a solid solution, quenching the solid solution in water, deforming the quenched alloy at room temperature to form a cold worked alloy and aging the cold worked alloy at a temperature in the range of 50 to 150 0 C, wherein the billets contain 0.2 to 2.0% Mg and 0.2 to 1.0% silicon
  • the invention provides a method for manufacture of a high- strength aluminium alloy, the method comprising heating billets of cast alloy containing aluminium and alloying elements at a temperature in the range of 450 0 C to 550 0 C to homogenize the alloy, deforming the billets in the homogenized state to form a hot worked alloy, first allowing the hot worked alloy to cool to room temperature and then heating the hot worked alloy from room temperature to a temperature at which the alloy forms a solid solution, quenching the solid solution in water, deforming the quenched alloy at room temperature to form a cold worked alloy and aging the cold worked alloy at a temperature in the range of 5O 0 C to 150 0 C, wherein the billets are heated at a temperature in the range of 45O 0 C to 55O 0 C 0 C for 1 to 10 hours.
  • the invention provides a method for manufacture of a high- strength aluminium alloy, the method comprising heating billets of cast alloy containing aluminium and alloying elements at a temperature in the range of 450 0 C to 550 0 C to homogenize the alloy, deforming the billets in the homogenized state to form a hot worked alloy, first allowing the hot worked alloy to cool to room temperature and then heating the hot worked alloy from room temperature to a temperature at which the alloy forms a solid solution, quenching the solid solution in water, deforming the quenched alloy at room temperature to form a cold worked alloy and aging the cold worked alloy at a temperature in the range of 50 to 150 0 C, wherein the hot worked alloy is heated from room temperature to a temperature in the range of 45O 0 CtO 55O 0 C
  • the invention provides a method for manufacture of a high- strength aluminium alloy, the method comprising heating billets of cast alloy containing aluminium and alloying elements at a temperature in the range of 450 0 C to 550 0 C to homogenize the alloy, deforming the billets in the homogenized state to form a hot worked alloy, first allowing the hot worked alloy to cool to room temperature and then heating the hot worked alloy from room temperature to a temperature at which the alloy forms a solid solution, quenching the solid solution in water, deforming the quenched alloy at room temperature to form a cold worked alloy and aging the cold worked alloy at a temperature in the range of 50 to 150 0 C, wherein the billets are deformed by rolling.
  • the invention provides a method for manufacture of a high- strength aluminium alloy, the method comprising heating billets of cast alloy containing aluminium and alloying elements at a temperature in the range of 450 0 C to 550 0 C to homogenize the alloy, deforming the billets in the homogenized state to form a hot worked alloy, first allowing the hot worked alloy to cool to room temperature and then heating the hot worked alloy from room temperature to a temperature at which the alloy forms a solid solution, quenching the solid solution in water, deforming the quenched alloy at room temperature to form a cold worked alloy and aging the cold worked alloy at a temperature in the range of 50 to 150 0 C, wherein the cold worked alloy has a strain value in the range of 0.5 to 2.0
  • the invention provides high-strength aluminium alloy prepared by the method comprising heating billets of cast alloy containing aluminium and alloying elements at a temperature in the range of 450 0 C to 550 0 C to homogenize the alloy, deforming the billets in the homogenized state to form a hot worked alloy, first allowing the hot worked alloy to cool to room temperature and then heating the hot worked alloy from room temperature to a temperature at which the alloy forms a solid solution, quenching the solid solution in water, deforming the quenched alloy at room temperature to form a cold worked alloy and aging the cold worked alloy at a temperature in the range of 50 to 150 0 C.
  • the invention provides high-strength aluminium alloy having Vicker's hardness in the range of 115 to 160, Yield strength in the range of 270 to 400 MPa and tensile strength in the range of 325 to 475 MPa at an elongation to failure ranging from 8 to 16%
  • the invention provides high strength aluminium alloy comprising intermetallic compound particles having particle size less than 20 nm
  • the invention provides high strength aluminium alloy having a submicron structure substantially homogeneously distributed throughout.
  • the invention provides articles shape formed from high strength aluminium alloy.
  • the method of the invention involves heating billets of cast alloy containing aluminium and alloying elements.
  • the alloy billets are typically cast from a mixture of liquid aluminium along with alloying elements.
  • the alloying elements are usually those elements commonly used for manufacturing heat treateable wrought alloy such as 6xxx, 2xxx and 7xxx series alloys.
  • alloying elements are selected from a group consisting of silicon, magnesium, copper and zinc.
  • the cast alloy billets are subjected to homogenization treatment by heating the billets at a temperature in the range of 450 to 550 0 C for 1 to 10 hours. During homogenization treatment, the alloying elements distribute themselves substantially , uniformly throughout the alloy.
  • the alloy billets are deformed under pressure at high temperature to form a hot worked alloy.
  • the deformation can be carried out by rolling, forging or extrusion.
  • the deformation is carried out by rolling to form a sheet of aluminium alloy.
  • the hot worked alloy is first allowed to cool to room temperature. After the alloy has attained room temperature, it is further heated to a temperature at which it forms a solid solution. Typically, the alloy is heated at a temperature in the range of 450 to 550 0 C for 1 to 10 hours. Usually, during this step of solution heat treatment, a solid solution of alloying elements in aluminum is formed. Solution heat treatment temperature determines the degree of solutionizing of various alloying elements and is therefore chosen carefully for the method of the invention.
  • the solution heat treated alloy is then quenched in water.
  • the quenched alloy is deformed at room temperature to form a cold worked alloy.
  • the cold worked alloy has a strain in the range of 0.5 to 2.0.
  • the cold worked alloy is then subjected to aging treatment at a temperature in the range of 50 to 150 0 C.
  • the aging is carried out for 12 to 48 hours.
  • the method of the invention provides a high strength aluminium alloy.
  • the aluminium alloy of the invention has Vicker's hardness in the range of 115 to 160 Hv5, yield strength in the range of 270 to 400 MPa and tensile strength in the range of 325 to 475 MPa at an elongation to failure ranging from 8 to 16%. It is presumed that the high values of strength for the alloys of the invention is due to its unique microstructure obtained by the presence of alloying element in solution during cold deformation, leading to high dislocation density and consequently to high degree of strain hardening.
  • the alloy of the invention comprise intermetallic compound particles having particle size less than 20 nm.
  • the particles are visible in the TEM (Transmission Electron Micrograph) images of the alloy displayed in Fig 1.
  • an intermetallic compound is magnesium suicide (Mg 2 Si), aluminum copper (Al 2 Cu), aluminum manganese (Al 2 Mn, Al 6 Mn) or derivatives thereof.
  • the alloy of the invention possess a submicron structure substantially homogeneously distributed throughout. The submicron structure of the alloy is evident from the TEM images displayed in Fig 2.
  • the X-Ray Diffraction pattern of the aluminium alloy of the invention is given in Fig 3.
  • the high strength aluminium alloy of the invention has the peaks corresponding to MG 2 Si, Al 6 Mn, AlFeSi and CuAl 2 in the XRD pattern obtained by using an X-ray radiation having wavelength 1.5418 Angstron
  • the invention also provide articles and products shape formed from the high strength alloys of the invention.
  • the articles and products that can be shape formed partly or completely from the alloys of the invention include, but are not limited to, airframe structures, automotive body parts, boats, deckhouses, funnels, masts and other components for boat and ship building.
  • the invention is further illustrated by way of the following non limiting examples.
  • Table 1 Elemental composition of the alloys ALl to AL5 used in Examples 1 to 4
  • Hot-rolled billets of aluminum alloys (alloys ALl to AL4) having elemental compositions as displayed in table 1 were solution treated at 530 to 55O 0 C for lhour each followed by quenching in water.
  • the billets were then cold rolled to about 2mm thickness imparting a total strain between 1.0 to 1.4.
  • small pieces of the resulting sheet were aged at 135 0 C for different time intervals. Hardness and tensile values were measured after final aging treatment.
  • Hot-rolled billets of aluminum alloys (alloys AL2 and AL5) having elemental compositions as displayed in table 1 were solution treated at 53O 0 C for 1 hour each followed by quenching in water. The billets were then cold forged imparting a total strain between 1.18 to 1.32. After forging, small piece of the resulting alloy were aged at 135 0 C for 24 hour each. Hardness and tensile values were measured after final aging treatment.
  • Example 2 Manufacture of aluminium alloy by conventional method
  • Hot-rolled billets of aluminum alloys (alloys ALl to AL 4) having elemental compositions as displayed in table 1 were cold rolled to about 2mm thickness imparting a total strain between 1.0 to 1.4. After rolling, the cold rolled sheets were solution treated at 53O 0 C for 1 hour each followed by quenching in water. The small pieces of solution treated sheets were aged at 170 0 C for 6 hours. Hardness and tensile values were measured after final aging treatment.
  • Example 3 Study of variation in hardness increment at various temperatures of solution heat treatment, of aluminium alloy, manufactured by following the procedure of example 1
  • Hot rolled billets of alloy AL2 were solution treated at temperatures in the range 400 and 55O 0 C followed by water quenching.
  • the solution treated billets were cold forged imparting a total strain between 1.21 to 1.36.
  • Hardness values of the alloy were measured before and after the forging treatment. Temperature below 45O 0 C were not found effective in ensuring complete dissolution of alloying elements in this case.
  • the hardness increments during forging (difference of hardness value after and before the forging) for different temperatures of solution heat treatment are displayed in table 3. Table 3 shows that the extent of hardening during cold deformation depends on the solution heat treatment temperature. —- •
  • Example 4 Study of variation in hardness increment at various temperatures of solution heat treatment, of aluminium alloy, manufactured by following the procedure of example 2
  • High-strength aluminium alloys of the invention enable manufacture of articles and products having high specific strength thereby rendering remarkable savings in weight and space.
  • the method of the invention provide considerable reduction in cost in applications such as manufacture of aircraft bodies and ship building where specific strength of the material is critical.
  • the alloys of the invention could be obtained with hardness values tailored for specific applications.
  • the high-strength aluminium alloys of the invention possess good formability, weldability, machinability, and relatively good corrosion resistance.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)

Abstract

La présente invention concerne un procédé pour la fabrication d’un alliage d’aluminium à résistance élevée, le procédé comprenant les étapes consistant à chauffer des billettes d’alliage coulé contenant de l’aluminium et allier les éléments à une température dans la plage de 450 °C à 550 °C pour homogénéiser l’alliage, déformer les billettes dans l’état homogénéisé pour former un alliage travaillé à chaud, dans un premier temps laisser l’alliage travaillé à chaud refroidir à température ambiante et ensuite chauffer l’alliage travaillé à chaud de la température ambiante à une température à laquelle l’alliage forme une solution solide, refroidir la solution solide dans l’eau, déformer l’alliage refroidi à température ambiante pour former un alliage travaillé à froid et vieillir l’alliage travaillé à froid à une température dans la plage de 50 à 150 °C. L’invention concerne en outre un alliage d’aluminium à résistance élevée fabriqué par le procédé et les articles et produits formés à partir de l’alliage.
PCT/IN2009/000436 2008-07-31 2009-07-31 Procédé de fabrication de feuilles d’alliage d’aluminium Ceased WO2010029572A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN1635MU2008 2008-07-31
IN1635/MUM/2008 2008-07-31

Publications (1)

Publication Number Publication Date
WO2010029572A1 true WO2010029572A1 (fr) 2010-03-18

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10513766B2 (en) 2015-12-18 2019-12-24 Novelis Inc. High strength 6XXX aluminum alloys and methods of making the same
US10538834B2 (en) 2015-12-18 2020-01-21 Novelis Inc. High-strength 6XXX aluminum alloys and methods of making the same
US11932928B2 (en) 2018-05-15 2024-03-19 Novelis Inc. High strength 6xxx and 7xxx aluminum alloys and methods of making the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038605A1 (fr) * 1980-04-18 1981-10-28 The Boeing Company Procédé de fabrication, à partir d'un alliage d'aluminium, d'un produit plat ou d'un produit extrude
US5938867A (en) * 1995-03-21 1999-08-17 Kaiser Aluminum & Chemical Corporation Method of manufacturing aluminum aircraft sheet
WO2004090185A1 (fr) * 2003-04-10 2004-10-21 Corus Aluminium Walzprodukte Gmbh Alliage al-zn-mg-cu
WO2004111282A1 (fr) * 2003-06-06 2004-12-23 Corus Aluminium Walzprodukte Gmbh Alliage d'aluminium presentant une haute tolerance aux dommages convenant en particulier pour les applications aerospatiales

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0038605A1 (fr) * 1980-04-18 1981-10-28 The Boeing Company Procédé de fabrication, à partir d'un alliage d'aluminium, d'un produit plat ou d'un produit extrude
US5938867A (en) * 1995-03-21 1999-08-17 Kaiser Aluminum & Chemical Corporation Method of manufacturing aluminum aircraft sheet
WO2004090185A1 (fr) * 2003-04-10 2004-10-21 Corus Aluminium Walzprodukte Gmbh Alliage al-zn-mg-cu
WO2004111282A1 (fr) * 2003-06-06 2004-12-23 Corus Aluminium Walzprodukte Gmbh Alliage d'aluminium presentant une haute tolerance aux dommages convenant en particulier pour les applications aerospatiales

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10513766B2 (en) 2015-12-18 2019-12-24 Novelis Inc. High strength 6XXX aluminum alloys and methods of making the same
US10538834B2 (en) 2015-12-18 2020-01-21 Novelis Inc. High-strength 6XXX aluminum alloys and methods of making the same
US11920229B2 (en) 2015-12-18 2024-03-05 Novelis Inc. High strength 6XXX aluminum alloys and methods of making the same
US12043887B2 (en) 2015-12-18 2024-07-23 Novelis Inc. High strength 6xxx aluminum alloys and methods of making the same
US11932928B2 (en) 2018-05-15 2024-03-19 Novelis Inc. High strength 6xxx and 7xxx aluminum alloys and methods of making the same

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