Effect of Heat Treatment on Stress Corrosion Cracking of AZ91 Magnesium Alloy

2018 International Conference on Advanced Electronic Materials, Computers and Materials Engineering

材料科学;无线电电子学;计算机科学

Fu, Hongde^1 ; Song, Yulai^1 ; Liu, Yaohui^1

School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun

130025, China^1

关键词: After-heat treatment;    AZ91 magnesium alloys;    Cleavage fracture;    Composition distributions;    Effect of heat treatments;    Heat treatment conditions;    Hydrogen evolution;    Stress corrosion fracture;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/439/4/042029/pdf
DOI  :  10.1088/1757-899X/439/4/042029

来源: IOP

【 摘 要 】

The effects of different heat treatment conditions (T4 solid solution, T6 solid solution + artificial aging) on the stress corrosion cracking behavior of cast AZ91 magnesium alloy were investigated. The results show that the heat treatment can significantly improve the stress corrosion cracking resistance, which will be attributed to the change of microstructure and composition distribution after heat treatment, improve the corrosion resistance of the alloy, and hinder the hydrogen evolution process of the cathode, thus weakening the hydrogen embrittlement effect. The heat treatment stress corrosion fracture is still cleavage fracture, but the plasticity characteristics are significantly increased compared with the as-cast fracture.