MICROSTRUCTURES OF Mg-Zr, Mg-Zn AND Mg-Zn-Zr ALLOYS
LUO Zhiping;ZHANG Shaoqing Institute of Aeronautical Materials; Beijing; China doctoral candidate;P.O. Box 81-4; Beijing 100095;China
Cite this article:
LUO Zhiping;ZHANG Shaoqing Institute of Aeronautical Materials; Beijing; China doctoral candidate;P.O. Box 81-4; Beijing 100095;China. MICROSTRUCTURES OF Mg-Zr, Mg-Zn AND Mg-Zn-Zr ALLOYS. Acta Metall Sin, 1993, 29(4): 30-36.
Abstract Microstructural studies have been made on the Mg-0.54Zr, Mg-5.68Zn andMg-5.65Zn-0.50Zr alloys in the as-cast and homogenenized states. The lenticular plates of{012} twins were found in the three alloys. After homogenization, the ZrH_2 phase formed inthe Mg-0.54Zr alloy. The Mg_7Zn_8 phase of cubic structure with α=1.417 nm distributes atthe grain boundaries of Mg-5.68Zn alloy. After homogenization, the Mg_7Zn_8 phase dissolvesand the MgZn_2 phase occurs. The as-cast Mg-5.65Zn-0.50Zr alloy consists ofMgZn_2 phase and Zn-Zr compounds. After homogenization, the dispersed acicularMgZn_2 phase may precipitate.
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