Microstructure Features during High Temperature Tensile Deformation of an AZ31 Alloy with Nd and La Additions
Microstructural features and tensile behaviors of an AZ31 alloy with Nd and La additions were investigated with elongation-to-failure tensile tests at constant temperatures of 300 °C, 350 °C, 400 °C, and 450 °C, and constant strain rates of 10-2 s-1 and 10-3 s-1. Experimental data show that the material exhibits tensile ductilities of over 100% at 450 °C, featured by long steady state deformation. Microstructure studies show that annealed coarse grains were remained in the gauge region after the tensile tests, and the dominate deformation mechanism was dislocation creep, other than dynamic recrystallization or grain boundary sliding. Cavity evolution near fracture end caused premature failure of the material, although fine grains developed through dynamic recrystallization.
Helen Zhang, David Jin and X.J. Zhao
J. Qiao et al., "Microstructure Features during High Temperature Tensile Deformation of an AZ31 Alloy with Nd and La Additions", Advanced Materials Research, Vol. 578, pp. 158-161, 2012