Microstructure Characterization and Mechanical Properties of a Zn and Rare Earth Modified Mg Alloy

Abstract:

In the present paper, the Mg-Zn-Y-Nd alloy is fabricated by as casting and hot extrusion. Microstructure and mechanical properties of the as-cast, heat treated and hot extruded alloys are investigated. The results exhibit that Mg₂₄Y₅ phase with eutectic structure forms in the as-cast alloy, which has an orientation relationship with matrix of _. The precipitating phase separates the matrix semi-continuously. The heat treatment results in most precipitates solid soluted into matrix, but there are still some nanoscale particles and residual phase along grain boundary. The hot extrusion refines the microstructure and leads to the formation of stacking faults in the matrix. Compared with the as-cast and heat treated alloy, the hot extruded alloy obtain great improvement in mechanical properties, which should be attributed to the grain refinement, solid solution and fomation of crystal defects

• Periodical: Applied Mechanics and Materials (Volumes 727-728)
• Pages: 111-114
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.727-728.111
• Online since: January 2015
• Authors: Li Yuan Sheng*, Fang Yang, Ting Fei Xi
• Keywords: Mechanical Property, Mg Base Alloy, Microstructure, TEM

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