Study on Mechanical Properties and Microstructures of Mg-6Zn-2Gd-0.6Zr New Sand-Casting Magnesium Alloy

Abstract:

A new composition sand-casting magnesium alloy, Mg-6Zn-2Gd-0.6Zr, was developed. It was found that the room temperature mechanical properties of the alloy were superior: b=270MPa, 0.2=175MPa, =8%. Meanwhile, the elevated-temperature strength and creep resistance were significantly improved, comparing with Mg-5Zn-0.6Zr (ZK51) commercial magnesium alloy. The as-cast microstructure of the alloy was mainly consisted of (Mg) matrix, (+Mg3Gd2Zn3+Mg3Gd) eutectic phase, which was distributed along the (Mg) grain boundary with coarse netted shape. After solid-solution treatment and subsequently aging treatment for the alloy, the secondary phases re-precipitated as fine discontinues semi-netted or short rod-like precipitations, also including some fine spherical precipitations in the  matrix, which were responsible for the properties improvement of the alloy.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 651-654
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.651
• Online since: June 2010
• Authors: Guang Yu Yang, Jie Hua Li, Wan Qi Jie, Zhong Yu
• Keywords: Creep Resistance, Magnesium Alloy, Mechanical Property, Microstructure, Sand-Cast

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