Effect of Al and Gd Solutes on the Strain Rate Sensitivity of Magnesium Alloys |
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| Authors: | N Stanford I Sabirov G Sha A La Fontaine S P Ringer M R Barnett |
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| Affiliation: | 1.Centre of Excellence for Design in Light Metals,Deakin University,Victoria,Australia;2.Instituto Madrile?o de Estudios Avanzados de Materiales (IMDEA-Materiales), E.T.S. de Ingenieros de Caminos,Madrid,Spain;3.Australian Key Centre for Microscopy and Microanalysis,The University of Sydney,Sydney,Australia |
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| Abstract: | Pure magnesium and two binary alloys, Mg-1 wt pct Al and Mg-1.4 wt pct Gd, have been prepared with comparable grain sizes
and textures. The alloys have been tensile tested at various strain rates and temperatures to examine the strain rate sensitivity
(SRS). It has been found that Mg and Mg-Al show increasing SRS with increasing deformation temperatures. The Mg-Gd alloy showed
decreasing SRS with increasing deformation temperatures and exhibited a negative SRS at 200 °C and 250 °C. Above these temperatures,
the SRS returned to a positive value. The elongation to fracture was not effected by the SRS, and it has been concluded that
for the alloys and conditions examined, the influences of mechanical twinning and dynamic recrystallization dominate the elongation
behavior, rather than the SRS. |
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