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

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Abstract:

Microstructure and mechanical properties of Mg-Zn-Er-Zr alloys were characterized in detail. The grain size of as-cast Mg-Zn-Er-Zr alloy was greatly decreased by the Mg-Zn-Er phases formed at grain boundaries. The addition of Er can increase the yield strength (YS) but decrease the ultimate tensile strength (UTS) and elongation of as-cast Mg-Zn-Zr alloy. The thermally stable Mg-Zn-Er phases were just partially dissolved into the matrix during solution treatment. And the addition of Er can prolong the precipitation process of Mg-Zn-Zr alloy. Solution-plus-ageing treatment can increase the strength of both the Mg-Zn-Zr and Mg-Zn-Er-Zr alloys, but the strengthening effect of Mg-Zn-Er-Zr alloy was greatly weakened, for the incompletely solution of Mg-Zn-Er phases. Er can greatly enhance the high temperature elongation of Mg-Zn-Zr alloy, but the increase of high temperature tensile strength was just a little.

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Periodical:

Materials Science Forum (Volumes 546-549)

Pages:

105-108

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.546-549.105

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Online since:

May 2007

Authors:

Qu Dong Wang, Da Quan Li, Qiang Li, Wen Jiang Ding

Keywords:

Hardness, Heat Treatment, Mg-Zn-Er Alloy, Microstructure, Strength

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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