Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 617, Issue -, Pages 243-248Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.07.042
Keywords
Semi-continuous cast; Extrusion; Heat treatment; Microstructure; Mechanical property
Categories
Funding
- Key Project of Chinese National Programs for Fundamental Research and Development (973 program) [2013CB632202]
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Semi-continuous cast Mg-8Gd-3Y-0AZr (wt%) alloy in different conditions was systematically investigated in its microstructure and mechanical properties. beta phase and eutectic compounds were observed in the as-cast alloy. beta phase and most of the eutectic compounds were dissolved into the matrix and Y-rich phase was precipitated during the homogenization. Extreme grain refinement and slight precipitation took place in the extrusion of the alloy. beta' phase precipitates were observed and studied in the peak-aged alloy. Effective strengthening modes were used to predict the strength and the results are consistent with the experiment. The results suggest that solution strengthening and grain boundary strengthening are the main strengthening factors of the as-extruded alloy, while beta' phase is the biggest strengthening contributor of the as peak-aged alloy. (C) 2014 Published by Elsevier B.V.
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