Microstructure and creep properties of Mg-3Al-1Si-xSr alloy

doi:10.13251/j.issn.0254-6051.2020.06.028

Abstract

Abstract: Microstructure of Mg-3Al-1Si alloy was adjusted by Sr microalloying and heat treatment processes (solid solution treatment and aging) to improve the creep properties of the alloy. The results show that the Sr element and solution treatment + aging treatment have a strong refining effect on the as-cast microstructure of the alloy. When the Sr content is 0.4% and the aging time is 24 h, the refining effect is the best. With the increase of Sr content and aging time, the creep life of the alloy increases. But the over-aging occurs when aging for 36 h which results in the decrease of creep life. After 420 ℃×10 h solid solution treatment + 180 ℃×24 h aging, the creep properties of the alloy is the best, with the creep life reaching 62.32 h, the steady-state creep rate reaching 5.545×10^-6 mm/s, and the creep fracture morphology gradually changes from cleavage fracture to ductile fracture.

Key words: Mg-3Al-1Si-xSr alloy, solid solution treatment, aging, microstructure, creep properties

CLC Number:

TG146

Chen Xinhao, Liu Xinyi, Li Yongxiang, Wang Wangbing, Zhang Zhichao, Wang Xu. Microstructure and creep properties of Mg-3Al-1Si-xSr alloy[J]. Heat Treatment of Metals, 2020, 45(6): 129-135.

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