Microstructure and creep behavior of the extruded Mg–4Y–4Sm–0.5Zr alloy

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 β precipitates were observed in the extruded alloys. Numerous fine globular β′ precipitates homogeneou...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2009-08, Vol.516 (1), p.189-192
Main Authors: Wang, Qudong, Li, Daquan, Blandin, J.J., Suéry, M., Donnadieu, P., Ding, Wenjiang
Format: Article
Language:English
Subjects:
Applied sciences
Chemical and Process Engineering
Chemical Sciences
Creep
Engineering Sciences
Exact sciences and technology
Extrusion
Material chemistry
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Mg–Y–Sm alloy
Microstructure
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Summary: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 β precipitates were observed in the extruded alloys. Numerous fine globular β′ 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.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2009.03.084