Comparison of As-Cast Microstructures and Solidification Behaviours of Mg-Zn-Al Ternary Magnesium Alloys with Different Zn/Al Mass Ratios

Ming Bo Yang; Hong Liang Li; Ren Ju Cheng

doi:10.4028/www.scientific.net/AMR.548.321

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 548Comparison of As-Cast Microstructures and...

Comparison of As-Cast Microstructures and Solidification Behaviours of Mg-Zn-Al Ternary Magnesium Alloys with Different Zn/Al Mass Ratios

Abstract:

The as-cast microstructures and solidification behaviours of Mg-Zn-Al ternary magnesium alloys with different Zn/Al mass ratios were investigated and compared. The results indicate that, when the Zn/Al mass ratio is less than 2, the alloys are composed of a-Mg and Mg₃₂(Al,Zn)₄₉ phases, and with the increase of the Zn/Al mass ratio, the amount of the second phase gradually decreases and its distribution changes from continuous net to quasti-continuous net. However, when the Zn/Al mass ratio is more than 2, the alloys are composed of a-Mg, Mg₃₂(Al,Zn)49 and MgZn phases, and with the increase of the Zn/Al mass ratio, the amount of the second phase gradually increases and its distribution changes from quasti-continuous net to uniform particles. In addition, the onset and the peak temperatures of the second phase transformation for the alloys with the Zn/Al mass ratio of less than 2, are higher than that of the alloys with the Zn/Al mass ratio of more than 2, which results in the different reactions during the second phase transformation and the different types of the second phase.