Effects of Y on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Magnesium Alloys

Abstract:

Mg-Zn-Zr-Y billets with different mass fraction of Y (wt%(Y)=0.2%、0.5%、1.0%、1.5%、2.0%) was prepared by permanent mold casting. The increase in Y content has shown grain refinement effects on the microstructure morphologies of Mg–Zn–Y–Zr alloys. When the content of Y achieves 1.0 wt%, the grain refinement effect of the Y is most obvious than any more contents of the Y content. In the test result of XRD, the type of precipitated phase in Mg-Zn-Zr-Y alloys is related to atomic ratio of Y/Zn. With content of Y increases, atomic ratio of Y/Zn increases,the precipitated phase in alloy is changed from Phase I to Phase W. Tensile strength and extension rate of alloy increase with the increasing of Y content; When Y content reaches 1.0%, mechanical property reaches maximum value.When content of Y exceeds 1.0%, with the increasing of Y content, mechanical property of alloy declines gradually.

• Periodical: Materials Science Forum (Volume 904)
• Pages: 29-35
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.904.29
• Online since: August 2017
• Authors: Da Yu Wang, Zhi Ming Du*, Hong Juan Zhang, Li Hua Chen, Chang Shun Wang
• Keywords: Magnesium Alloys, Mechanical Properties, Precipitated Phase, Y Ttrium

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