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The Creep Behaviour of Extruded Mg-5Li-3Al-1.5Zn-2RE Alloy

Authors :
Zhan Yi Cao
Yong Bing Liu
Ting Qu Li
Li Ren Cheng
Dong Mei Jiang
Source :
Advanced Materials Research. 213:492-496
Publication Year :
2011
Publisher :
Trans Tech Publications, Ltd., 2011.

Abstract

The Mg-5Li-3Al-1.5Zn-2RE (LaPrCe) alloy was prepared by hot-chamber extrusion process after casting. The alloy consists of α-Mg solid solution and intermetallic phases (Al11RE3 phase and Al2RE 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 Al11RE3 phase, which had thermal stability at 448K during the creep test. The dislocations pinned and cross-slip dislocations were observed.

Details

ISSN :
16628985
Volume :
213
Database :
OpenAIRE
Journal :
Advanced Materials Research
Accession number :
edsair.doi...........9119c1c524f1ebc11412b063d1a03ac6