期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 473, 期 1-2, 页码 446-452出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2008.06.016
关键词
Samarium (Sm); Rare earth element; Mg-Al-Ca alloys; Casting; Extrusion
资金
- Fundamental R&D Program for Core Technology of Materials
- Ministry of Commerce, Industry and Energy, Republic of Korea
Samarium (Sm) additions to as-cast Mg-5Al-Ka-based alloys result in changes, such as equiaxed grains and a refined grain size. The microstructure of as-cast Mg-5Al-3Ca-xSm alloys consists of an alpha-Mg matrix, a (Mg,Al)(2)Ca eutectic phase, and an Al2SM intermetallic compound. In as-castalloys, the (Mg,AI)(2)Ca eutectic phase was located at grain boundaries with a chain structure, and the Al2SM intermetallic compounds were homogeneously distributed at the alpha-Mg matrix and grain boundaries. The eutectic phase of the extruded alloys was elongated in the extrusion direction and crushed into fine particles because of severe deformation during hot extrusion, and the grain size was refined with an increased amount of Sm addition. The maximum values of the yield strength and tensile strength were 313 MPa and 330 MPa at 2 wt%Sm alloy content. respectively. (C) 2008 Elsevier B.V. All rights reserved.
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