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Compressive Creep Behaviour of Extruded Mg-10Gd-3Y-0.5Zr (wt.%) Alloy
Abstract:
The compressive creep behaviour of extruded Mg-10Gd-3Y-0.5Zr (wt.%, GW103) alloy was investigated at temperatures from 200 °C to 300 °C and under stresses from 50 MPa to 120 MPa. The peak-aged alloy exhibited minimum creep rates ranging from 1.90×10-9 s-1 to 6.14×10-6 s-1 and the aging treatment exerted a positive effect on its creep performance. The measured stress exponent of the peak-aged extruded alloy varied from 2.0 to 3.4, while the activation energy was 83.4 kJ/mol and 184.3 kJ/mol at low temperature and high temperature regime, respectively. This suggested grain boundary sliding was the primary creep mechanism at low temperature but dislocation-controlled creep dominated at high temperature. XRD patterns and SEM micrographs indicated precipitates increased with creep time, and further dynamic recrystallization occurred. Precipitate free zones (PFZs) were clearly observed near the grain boundaries parallel to the loading direction.
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568-573
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July 2013
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