Microstructure Evolution and Mechanical Properties of Mg-3Zn-0.5Er-0.5Al Alloy

Abstract:

The microstructure evolution of the Mg-3Zn-0.5Er-0.5Al (mass fraction, %) alloy under the different condition was investigated. The results showed that as-cast Mg-3Zn-0.5Er-0.5Al alloy mainly consisted of primary large irregular Mg₄Zn₇ phase and needlelike (Mg, Zn, Er, Al) quaternary phase. Mg₄Zn₇ phase almost dissolved into the matrix after solid solution treatment at 400 ^oC for 10 h, while the (Mg, Zn, Er, Al) quaternary phase still existed. The solution treated alloy was extruded at 250 °C. The ultimate tensile strength of the as-extruded alloy was approximately 268 MPa and the YTS was approximately 163 MPa companying with an elongation of 28%. The tensile strength of the as-extruded alloy improved obviously, which was mainly attributed to the grain refinement.

• Periodical: Materials Science Forum (Volume 816)
• Pages: 446-450
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.816.446
• Online since: April 2015
• Authors: Xiao Bing Zheng, Wen Bo Du*, Ke Liu, Zhao Hui Wang, Shu Bo Li
• Keywords: Extrusion, Heat Treatment, Mechanical Properties, Mg-3Zn-0.5Er-0.5Al Alloy, Microstructure

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