Novel α-Al(MnCr)Si Dispersion Strengthened Al-Mg-Si-Cu Alloy with Extraordinary Recrystallization Resistance
WANG Xiaoguo1,2, QIN Jian2,3,*, LIU Fangzhen2,3, NAGAUMI Hiromi 2,3
1 College of Agricultural Engineering, Shanxi Agricultural University, Taigu 030801, Shanxi, China 2 High Performance Metal Structural Materials Research Institute, Soochow University, Suzhou 215021, Jiangsu, China 3 Shagang School of Iron and Steel, Soochow University, Suzhou 215021, Jiangsu, China
Abstract: In this work, the commercial 6061 alloy and a Mn/Cr micro-alloyed Al-Mg-Si-Cu (denoted as HSW-1 alloy) were subjected to thermal deformation treatment under different conditions (deformation temperature:300, 400, 500 ℃; strain rate:0.01, 0.1, 1, 10 s-1; true strain:1.2) to study the microstructure evolution of the deformed alloys during solution and aging heat treatments. TEM observation confirmed that a large number of nano-scale α-Al(MnCr)Si dispersiods were uniformly distributed in HSW-1 alloy. Then quasi-in-situ EBSD analysis was used to characterize the microstructure evolution and count the distribution of misorientation distribution as well as sub-grain size changes of the two deformed alloys during different soaking times at 560 ℃. The results showed that the dispersiods could significantly improve the recrystallization resistance of Al-Mg-Si-Cu alloy, maintain the deformation microstructure and obtain high-strength alloys. Finally, theoretical analysis was applied to propose a control model for the microstructure of the two deformed alloys after T6 heat treatment. The microstructure composition after heat treatment can be precisely regulated by adjusting the deformation parameters, that is, deformation temperature and strain rates, and the experimental data effectively support the feasibility of the model.
作者简介: Xiaoguo Wang is a lecturer in College of Agricultural Engineering,Shanxi Agricultural University. He gra-duated from Guizhou University with a bachelor’s degree in materials forming and control engineering in 2009,a master’s degree in vehicle engineering in Guizhou University in 2012,and a doctoral degree in materials science and engineering in Taiyuan University of Science and Technology in 2020. He is currently engaged in the research of automotive light-weighting and high performance aluminum alloy development. He has published more than 20 papers,including Metallurgical and Materials Transactions A,Rare Metal Materials and Engineering,Transactions of Nonferrous Metals Society of China,Advances in Materials Science and Engineering,etc. Jian Qin is a postdoctoral fellow at High Performance Metal Structural Materials Research Institute,Soochow University. He received his B.S. degree in materials science and engineering from Northeastern University in 2007,materials science from the School of Materials,Northeastern University in 2010,and Ph.D. degree in materials science from the University of Quebec in 2016. Currently,he is mainly engaged in the research of ultra-fine sub-grain control technology and thermal processing process development of new 6XXX alloy for automotive chassis. He has published more than 20 papers,including Metallurgical and Materials Transactions A,Journal of Materials Research and Technology,Journal of Alloys and Compounds,Materials Transactions,etc.
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2023, Vol. 37 
