The effect of initial grain size and temperature on the tensile properties of magnesium alloy AZ31 sheet
作者： D.L. Atwell , M.R. Barnett , W.B. Hutchinson
DOI: 10.1016/J.MSEA.2012.03.107
关键词: Formability 、 Plasticity 、 Magnesium alloy 、 Grain boundary 、 Strain rate 、 Grain size 、 Metallurgy 、 Slip (materials science) 、 Ultimate tensile strength 、 Materials science
摘要: Abstract This research aimed to assemble and review data that are relevant sheet metal formability of the magnesium alloy AZ31. Rolled sheets were processed give four different grain sizes in range from 2.9 47.1 μm. Similar basal textures present all these conditions. Tensile tests carried out at various temperatures between 25 °C 240 °C, with some additional also made below room temperature dry ice. Results presented discussed relating strength, ductility, strain rate sensitivity anisotropy. An optimum size about 7 μm applies for ductility over most interval. Uniform elongation decreases steadily increasing whereas post-necking total values increase markedly. Measurements anisotropy indicate a significant role boundary mediated deformation above temperature. The plastic ratio, r, is high but considerably, especially fine grained conditions, higher temperatures. Modifications active slip modes occur same interval their effect on plasticity probably less important than was previously believed.
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