期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 42, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/42/12/125403
关键词
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资金
- National Natural Science Foundation of China [50874079]
- Shanxi Province Study Abroad Foundation of China [2006-31]
First-principles calculations were performed to study the mechanical properties of typical precipitates of creep resistant magnesium alloys (Mg2Si, Mg2Ge, Mg2Sn and Mg3Zn3Y2). Formation enthalpies and cohesive energies, elastic constants C-11, C-12, C-44, bulk modulus B-0, Young's modulus E, shear modulus G, the ratios of shear modulus to bulk modulus G/B-0, negative Cauchy pressure parameter (C-12-C-44) and Poisson's ratio nu of four precipitates were discussed. The results show that Mg2Si and Mg2Ge are stiffer than Mg3Zn3Y2. The charge density was further investigated to clarify the electronic causes.
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