Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 516, Issue 1-2, Pages 189-192Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.03.084
Keywords
Mg-Y-Sm alloy; Creep; Microstructure; Extrusion
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Funding
- Shanghai Science and Technology Committee, Shanghai/Rhone-Alpes Science and Technology cooperation [06SR07104]
- French Ministry of Foreign Affairs and of the Rhone-Alpes Regional Council
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The microstructure and creep behavior of the extruded Mg-4Y-4Sm-0.5Zr alloy were investigated. It was shown that dynamic recrystallization (DRX) took place during extrusion at 673 K and equilibrium beta precipitates were observed in the extruded alloys. Numerous fine globular beta' precipitates homogeneously formed within grains when the as-extruded alloy was aged at 473 K for 16 h, leading to effectively strengthening. The as-extruded alloy exhibits good creep resistance. The creep stress exponent n is 4.42 and the creep activation energy Q is 140.6 kJ mol(-1) suggesting that dislocation climb plays a dominant role when the alloy is crept at temperatures ranging from 453 K to 493 K and at a stress of 180 MPa. (c) 2009 Elsevier B.V. All rights reserved.
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