Microstructure and Plastic Deformation Behavior of Modified AA7075-T6 Aluminum Alloy

Abstract:

This study investigated the plastic deformation behavior and microstructure evolution of the modified AA7075 alloy (using Eco-Mg in lieu of Mg element). Before the compression tests, the microstructure was observed and phase analysis was performed. As the conditions for the compression tests, temperature range was from 523K to 723K and strain rates were controlled from 10^-2 s^-1 to 10 s^-1 using Gleeble equipment. The flow stress of the modified AA7075 alloy with their small grain size and second phases were slightly higher than that of conventional AA7075 alloy. The activation energy for the plastic deformation of this alloy was about 135.9kJ/mol, a relatively lower value compared with the conventional AA7075 alloy (more than 140kJ/mol). The processing map of the modified AA7075-T6 alloy was plotted and compared with that of conventional alloys. This alloy showed similar formability with the conventional AA7075 alloy, i.e., similar area of stable deformation region. We also attempted to discuss plastic deformation behavior related to its microstructure.

• Periodical: Advanced Materials Research (Volume 893)
• Pages: 424-429
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.893.424
• Online since: February 2014
• Authors: Kyu Sik Kim, Gwan Yeung Kim, Si Young Sung, Beom Suck Han, Yong Nam Kwon, Kee Ahn Lee*
• Keywords: Hot Compression, Microstructure, Modified AA7075 Alloy, Plastic Deformation

References

[1] E.A. Starke, J.T. Staley, Application of modern aluminum alloys to aircraft, Prog. Aerospace Sci. 32 (1996) 131-172.

DOI: 10.1016/0376-0421(95)00004-6

[2] H. Zhang, N. Jin, J. Chen, Hot deformation behavior of Al-Zn-Mg-Cu-Zr aluminum alloys during compression at elevated temperature, Trans. Nonferrous Met. Soc. China 21 (2011) 437-442.

DOI: 10.1016/s1003-6326(11)60733-4

[3] J.H. Seo, H.K. Lim, S.K. Kim, Microstructures and mechanical properties of diecast 0. 7wt%CaO added Eco-Mg parts, J. Kor. Foundry Soc. 30 (2010) 26-32.

[4] J.H. Seo, S.K. Kim, Mechanical properties of 0. 24-0. 65wt% CaO added AM60B Eco-Mg diecastings at room and elevated temperatures, J. Kor. Foundry Soc. 31 (2011) 11-17.

DOI: 10.7777/jkfs.2011.31.1.011

[5] S.H. Kim, K.S. Kim, S.K. Kim, Y.O. Yoon, K.S. Cho, K.A. Lee, Microstructure and mechanical properties of Eco-2024-T3 aluminum alloy, Adv. Mater. Res. 602-604 (2013) 623-626.

DOI: 10.4028/www.scientific.net/amr.602-604.623

[6] G.Y. Kim, K.S. Kim, S.K. Kim, Y.O. Yoon, K.S. Cho, K.A. Lee, High cycle fatigue behavior of Eco7075-T73 aluminum alloy, Adv. Mater. Res. 690-693 (2013) 1775-1778.

DOI: 10.4028/www.scientific.net/amr.690-693.1775

[7] Y.C. Lin, L.T. Li, Y.X. Fu, Y.Q. Jiang, Hot compressive deformation behavior of 7075 Al alloy under elevated temperature, J. Mater. Sci. 47 (2012) 1306-1318.

DOI: 10.1007/s10853-011-5904-y

[8] T. Sakai, C. Takahashi, Flow softening of 7075 aluminum alloy under hot compression, Mater. Trans. 32 (1991) 375-382.

DOI: 10.2320/matertrans1989.32.375

[9] S. Chen, K. Chen, G. Peng, X. Chen, Q. Ceng, Effect of heat treatment on hot deformation behavior and microstructure evolution of 7085 aluminum alloy, J. Alloys & Comp. 537 (2012) 338-345.

DOI: 10.1016/j.jallcom.2012.05.052

[10] Y.C. Lin, L.T. Li, Y.C. Xia, Y.Q. Jiang, Hot deformation and processing map of a typical Al-Zn-Mg-Cu alloy, J. Alloys & Comp. 550 (2013) 438-445.

DOI: 10.1016/j.jallcom.2012.10.114

[11] M. Rajamuthamilselvan, S. Ramanathan, Hot deformation behaviour of 7075 alloy, J. Alloys & Comp. 509 (2011) 948-952.

DOI: 10.1016/j.jallcom.2010.09.139

[12] A. Abolhasani, A. Zarei-Hanzaki, H.R. Abebi, M.R. Rokni, The room temperature mechanical properties of hot rolled 7075 aluminum alloy, Mater. Design 34 (2012) 631-636.

DOI: 10.1016/j.matdes.2011.05.019