Effect of extrusion on microstructures, and mechanical and creep properties of Mg–Al–Sr and Mg–Al–Sr–Ca alloys
Effect of extrusion on microstructures, and mechanical and creep properties of Mg–Al–Sr and Mg–Al–Sr–Ca alloys
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DOI：
10.1016/j.scriptamat.2006.08.020
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发表时间：
2006-12
影响因子：
6
通讯作者：
B. Jing;Yangshan Sun;Xueyuan Feng;X. Shan;Qiang Jing;Weijian Tao
中科院分区：
文献类型：
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作者：
B. Jing;Yangshan Sun;Xueyuan Feng;X. Shan;Qiang Jing;Weijian Tao
Mg-4Al-2Sr合金的铸态组织由枝晶α-Mg和晶界第二相、Al 4Sr和Mg-Al-Sr三元化合物组成。添加1%的钙会导致晶界处形成Mg 2Ca，并在基体晶粒中析出Al 2Ca。热挤压后，金属间化合物转变为带状组织，共晶相破碎成小块。热挤压使合金的拉伸性能显著提高，但挤压变形后合金的蠕变抗力明显降低。
The as-cast microstructure of Mg–4Al–2Sr consists of the dendritic α-Mg and grain boundary second-phases, Al4Sr and a ternary Mg–Al–Sr compound. One per cent calcium addition causes the formation of Mg2Ca at grain boundaries and Al2Ca precipitates in the matrix grains. After hot extrusion the intermetallics are converted into band structure and eutectic phases are crushed into small blocks. Hot extrusion results in significant increase of tensile properties; however, the creep resistances of both alloys are obviously reduced after extrusion deformation.