期刊
MATERIALS & DESIGN
卷 31, 期 9, 页码 4043-4049出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2010.05.008
关键词
Non-ferrous metals and alloys; Mechanical properties; Microstructure
资金
- Natural Science Foundation of CQ CSTC [2008BA4036]
- National Natural Science Foundation of China [50725413]
The effects of trace Er addition on the microstructure in Mg-9Zn-0.6Zr alloy during casting, homogenization, pre-heating, and hot extrusion processes were examined. The mechanical properties of alloys with and without Er were compared. The results showed that Er exhibited a lower solubility in solid magnesium and formed thermally stable Er- and Zn-bearing compounds. The Er-bearing alloy exhibited a considerably improved deformability, as well as a fine and uniform microstructure. Moreover, dynamic precipitation of fine MgZn(2) particles with a modified spherical morphology occurred during hot extrusion, resulting in a tensile yield strength of 313 MPa and a high elongation to failure value of 22%. Further aging of the Er-bearing alloy led to an increment of another 30 MPa in yield strength. In addition, Er markedly increased the thermal stability of the alloy structure. (C) 2010 Elsevier Ltd. All rights reserved.
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