期刊
RARE METALS
卷 30, 期 2, 页码 131-136出版社
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-011-0211-y
关键词
magnesium alloys; holmium; rare earth additions; heat treatment; microstructure; mechanical properties
资金
- National Natural Science Foundation of China [51074106]
- Shanghai Science and Technology Committee [06SR07104]
- National High-Tech Research and Development Program of China [2009AA033501, 2006BAE04B01-2]
The microstructure and mechanical properties of Mg-Zn-Ho-Zr alloys have been investigated in detail. The grain size of the as-cast Mg-Zn-Ho-Zr alloy was greatly decreased by the addition of Ho, and the grain growth during solution treatment was suppressed by Mg-Zn-Ho phases formed at grain boundaries. These thermally stable Mg-Zn-Ho phases could not completely dissolve into the matrix during solution treatment, and the strengthening effect of solution-plus-ageing treatment weakened. The addition of Ho can greatly enhance the high-temperature elongation of the Mg-Zn-Ho-Zr alloy, but the increase of high-temperature tensile strength was just a little.
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