Abstract
Super plastic behavior of the commonly as-extruded Mg-3Zn-1Al (ZA31) magnesium alloy is investigated at temperatures ranging from 593 to 623K and strain rates ranging from 8×10-5 to 10-3s-1. The results show that the alloy exhibits excellent super plasticity and the maximum elongation-to-failure reaches 220.4%. The alloy also shows a high strain rate sensitivity exponent of 0.38. Microstructure observations suggest that grain boundary sliding (GBS) with cavity coordination makes a substantial contribution to the super plastic deformation.
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