Effect of Grain Structure on Mechanical and Corrosion Properties of Al-Zn-Mg Alloy
WANG Pengyu1, YE Lingying1,2,*, KE Bin1, HU Tianjiao1, DONG Yu1, LIU Shengdan1,2
1 School of Materials Science and Engineering, Central South University, Changsha 410083, China 2 Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China
Abstract: Taking Al-Zn-Mg alloys with two different grain structures, recrystallized and fibrous as the research object, through room temperature tensile, exfoliation corrosion, slow strain rate tensile, four-point bending tests, the effects of grain structure on the mechanical properties and corrosion properties of the alloy were investigated by OM, TEM, SEM and EBSD. The results showed that:compared with the recrystallized structure alloy, the yield strength of the fiber-structured alloy was increased by 24.7 MPa and the tensile strength was increased by 56 MPa, the tensile strength and elongation loss rate in the slow strain rate tensile test were 65.2% and 80.3% lower than those of the recrystallized alloy, and the stress corrosion index was reduced by 75.5%, the time to fracture during the four-point bending test was 57 times longer than that of recrystallized alloys, compared with the recrystallized structure alloy, the maximum corrosion depth of exfoliation corrosion of the fiber structure alloy was increased by 160.4%. The improvement of the mechanical properties of the alloy with fibrous structure was mainly due to the grain refinement strengthening effect, and the improvement of the stress corrosion resistance was mainly due to its lower recrystallization fraction and lower proportion of high-angle grain boundaries.
王鹏宇, 叶凌英, 柯彬, 胡恬娇, 董宇, 刘胜胆. 晶粒组织对Al-Zn-Mg合金力学性能和腐蚀性能的影响[J]. 材料导报, 2023, 37(19): 22050211-7.
WANG Pengyu, YE Lingying, KE Bin, HU Tianjiao, DONG Yu, LIU Shengdan. Effect of Grain Structure on Mechanical and Corrosion Properties of Al-Zn-Mg Alloy. Materials Reports, 2023, 37(19): 22050211-7.
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2023, Vol. 37 
