Relationship among mechanical properties anisotropy, microstructure and texture in AA 6111 alloy sheets

Abstract

We comparatively studied the mechanical properties anisotropy, microstructure and texture of the commercial and the new developed AA6111 alloys through tensile test, optical microscopy, and XRD analysis. The results show that the anisotropy of mechanical properties for the developed AA6111 alloy is lower than that of the commercial alloy. The developed alloy possesses higher r value, lower Δr value and more uniform microstructure, compared with the commercial AA6111 alloy, indicating that the deep drawability of the developed alloy has been improved significantly. The recrystallization textures of the two alloy sheets are also different. The recrystallization texture of the commercial alloy sheet mainly includes Cube and {114}<311> orientations, while the recrystallization texture of developed alloy sheet consists of Cube, Goss and R orientations. The relationships among the deep drawabilities, microstructure and texture were discussed thereafter.

Keywords

AA6111 alloy / mechanical properties anisotropy / microstructure / deep drawability / texture

References

[1] Burger G B, Gupta A K, Jeffrey P W, et al. Microstructural Control of Aluminum Sheet Used in Automotive Applications[J]. Mater. Charact., 1995, 35(1): 23-39.

[2] Hirsch J, Al-Samman T. Superior Light Metals by Texture Engineering: Optimized Aluminum and Magnesium Alloys for Automotive Applications[J]. Acta Mater., 2013, 61(3): 818-843.

[3] Sidor J J, Petrov R H, Kestens L A I. Modeling the Crystallographic Texture Changes in Aluminum Alloys during Recrystallization[J]. Acta Mater., 2011, 59(14): 5735-5748.

[4] Engler O, Hirsch J. Texture Control by Thermomechanical Processing of AA6xxx Al-Mg-Si Sheet Alloys for Automotive Applications-a Review[J]. Mater. Sci. Eng., 2002, A336: 249-262.

[5] Sidor J, Miroux A, Petrov R, et al. Controlling the Plastic Anisotropy in Asymmetrically Rolled Aluminium Sheets[J]. Philos. Mag., 2008, 88(30-32): 3779-3792.

[6] Liu H, Song W J, Zhao G, et al. Effect of Mg on Microstructures and Properties of Al-Mg-Si-Cu Aluminium Alloys for Automotive Body Sheets[J]. Trans. Nonferrous Met. Soc. China, 2005, 15(1): 30-34.

[7] Ghosh M, Miroux A, Werkhoven R J, et al. Warm Deep-drawing and Post Drawing Analysis of Two Al-Mg-Si Alloys[J]. J. Mater. Process. Technol., 2014, 214(4): 756-766.

[8] Hu Z Q, Wan L, Wu S S, et al. Microstructure and Mechanical Properties of High Strength Die-casting Al-Mg-Si-Mn Alloy[J]. Mater. Des., 2013, 46: 451-456.

[9] Inoue H, Takasugi T. Texture Control for Improving Deep Drawability in Rolled and Annealed Aluminum Alloy Sheets[J]. Mater. Trans., 2007, 48(8): 2014-2022.

[10] Davies G. Materials for Automobile Bodies[M], 2004 Pergamon: Oxford.

[11] Inoue H, Yamasaki T, Gottstein G, et al. Recrystallization Texture and r-value of Rolled and T4-treated Al-Mg-Si Alloy Sheets[J]. Mat. Sci. Forum, 2005, 495-497: 573-578.

[12] Sidor J, Petrov R, Kestens L. Deformation, Recrystallization and Plastic Anisotropy of Asymmetrically Rolled Aluminum Sheets[J]. Mat. Sci. Eng., 2010, A528: 413-424.

[13] Engler O, Randle V. Introduction to Texture Analysis, 2nd ed.[M], 2009 London: CRC Press.

[14] Wu P D, Macewen S R, Lloyd D J, et al. Effect of Cube Texture on Sheet Metal Formability[J]. Mat. Sci. Eng., 2004, A364: 182-187.

[15] Jin H, Lloyd D J. Evolution of Texture in AA6111 Aluminum Alloy after Asymmetric Rolling with Various Velocity Ratios between Top and Bottom Rolls[J]. Mat. Sci. Eng., A465: 267-273

[16] Engler O, Kim H C, Huh M Y. Formation of {111}Fibre Texture in Recrystallised Aluminium Sheet[J]. Mat. Sci.Technol., 2001, 17(1): 75-86.

[17] Singh R K, Singh A K, Prasad N E. Texture and Mechanical Property Anisotropy in an Al-Mg-Si-Cu Alloy[J]. Mat. Sci. Eng., 2000, A277: 114-122.

[18] Leu D. Prediction of the Limiting Drawing Ratio and the Maximum Drawing Load in Cup-drawing[J]. Int. J. Mach. Tool. Manu., 1997, 37(2): 201-213.

[19] Engler O, Vatne H E, Nes E. The Roles of Oriented Nucleation and Oriented Growth on Recrystallization Texture in Commercial Purity Aluminium[J]. Mat. Sci. Eng., 1996, A205: 187-198.

[20] Liu Y S, Kang S B, Ko H S. Texture and Plastic Anisotropy of Al-Mg-0.3Cu-1.0Zn Alloys[J]. Scripta Mater., 1997, 37(4): 411-417.

[21] Bung H J. Texture Analysis in Material Science[M], 1982 London: Butterworths Press.

[22] Sidor J, Miroux A, Petrov R, et al. Microstructural and Crystallographic Aspects of Conventional and Asymmetric Rolling Processes[J]. Acta Mater., 2008, 56(11): 2495-2507.