Huang Zhenghua

Hot Deformation Behavior and Microstructure of AZ31-1Sm Alloy Compression at Elevated Temperatures

Abstract The hot deformation behavior of AZ31-1Sm alloy and its microstructure evolution were investigated by isothermal axisymmetric hot compression tests at temperatures ranging from 300 to 450 °C and strain rates from 0.01 to 1 s−1. The results show that the steady flow stress increases with increasing of the strain rate or decreasing of the deformation temperature, which can be described by a hyperbolic-sine constitutive equation with the deformation activation energy of 160.8 kJ/mol. AZ31-1Sm alloy is easy to promote the dynamic recrystallization (DRX). The tendency of the dynamic recrystallization enhances at high deformation temperatures and low strain rates. Recrystallization grains size increases with the deformation temperature increasing or strain rate decreasing.

Microstructure evolution and mechanical properties of biomedical Mg-Zn-Gd alloy wires

In order to manufacture the Mg-Zn-Gd alloy fine wires for the development of new biomedical Mg alloy implant devices, a hot extrusion and cold drawing process which is used to develop the Mg-Zn-Gd alloy fine wires were investigated. The results demonstrate that the Mg-Zn-Gd alloy has good formability. The microstructure and properties of the Mg-Zn-Gd alloy wires were studied by the observations of optical microscopy and scanning electron microscopy. The results show that the process is successfully developed to manufacture the high-quality wires with 3.00 mm diameter. The achievement of the high-quality Mg-Zn-Gd alloy wires is ascribed to the refined microstructure due to dynamic recrystallization during hot extrusion. Additionally, the grain morphology can play an important role in affecting the subsequent cold drawing performance.