The creep behaviour of extruded Mg-5Li-3Al-1.5Zn-2RE alloy

The Mg-5Li-3Al-1.5Zn-2RE (LaPrCe) alloy was prepared by hot-chamber extrusion process after casting. The alloy consists of a-Mg solid solution and intermetallic phases (AlllRE3 phase and A12RE phase). The microstructural analysis of the alloy reveals the correlation between microstructure and creep properties. The stress exponent of n varies from 4.25 to 6.23, and the activation energy varies from 104 to 134 kJ/mol. There is a transition between dislocations climb dominated creep mechanism and dislocation creep controlled by non-basal planes slip. Tensile creep tests were combined with detailed transmission electron microscopy in order to characterize the All 1RE3 phase, which had thermal stability at 448K during the creep test. The dislocations pinned and cross-slip dislocations were observed.
magnesium-lithium alloys microstructure dislocation creep property
Ting-qu Li Yong-bing Liu Zhan-yi Cao Li-ren Cheng Dong-mei Jiang
Key Laboratory of Automobile Materials of Ministry of Education, Jilin University,Chanachun 130025. PR China
国际会议
2011 International Conference on Advanced Material Research(ICAMR 2011)(2011年先进材料研究国际会议)
重庆
英文
492-496
2011-01-21(万方平台首次上网日期,不代表论文的发表时间)