Effect of initial microstructure on superplastic deformation of AZ70 magnesium alloy

来源期刊:中国有色金属学报(英文版)2010年增刊第2期

论文作者:王盼 吴立鸿 关绍康

文章页码:527 - 532

Key words:AZ70 magnesium alloy; superplasticity; microstructure; deformation mechanism

Abstract: The mechanical properties and deformation mechanism of semi-continuously casting and as-extruded AZ70 magnesium alloys in a wide range of grain sizes (from 14 to 103 μm) were investigated at 653 K and 1×10-3 s-1. It is discovered that with reducing grain size, flow stress is weakened and plasticity is improved and even superplasticity exhibits. SEM and OM were used to clarify the deformation mechanism. It is suggested that dynamic recrystallization (DRX) is the coordination deformation mechanism of grain boundary sliding (GBS) for coarse grain, and cavity and intracrystalline slip are the coordination deformation mechanisms of GBS for fine grain.

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