Effect of isothermal treatment on semi-solid microstructure of extruded AZ80A magnesium alloy

doi:10.13251/j.issn.0254-6051.2021.10.007

Abstract

Abstract: AZ80A magnesium alloy semisolid billet was prepared by strain induced melting activation (SIMA) method, and the effects of holding temperature and holding time on the semi-solid microstructure were studied. The results show that the average grain size and liquid fraction of the AZ80A magnesium alloy increase with the increase of the holding temperature and holding time, and the shape factor increases first and then decreases. The semi-solid microstructure is composed of α-Mg grains, liquid phase at grain boundary and intragranular “small liquid pools” formed by the enrichment of Al and Zn elements. The microstructure evolution can be divided into three stages: initial grain growth, grain spheroidization and separation, and finally grain coarsening. When using the SIMA method to prepare semi-solid AZ80A magnesium alloy, the suitable holding temperature is 550 ℃ and the holding time is 45 min, by which the average grain size, shape factor and liquid fraction of the semi-solid microstructure are 89 μm, 0.795 and 26.7%, respectively.

Key words: AZ80A magnesium alloy, semi-solid microstructure, holding temperature, holding time, microstructure evolution

CLC Number:

TG146.22

Duan Xingwang, Li Peng, Li Kai. Effect of isothermal treatment on semi-solid microstructure of extruded AZ80A magnesium alloy[J]. Heat Treatment of Metals, 2021, 46(10): 39-44.

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