Effects of cryogenic treatment on mechanical properties of extruded Mg-Gd-Y-Zr(Mn) alloys

来源期刊：中南大学学报(英文版)2007年第3期

论文作者：熊创贤 张新明 邓运来 肖阳 邓桢桢 陈部湘

文章页码：305 - 309

Key words：magnesium alloy; cryogenic treatment; mechanical property; microstructure

Abstract: The influence of cryogenic treatment on the mechanical properties of the extruded Mg-Gd-Y-Zr(Mn) alloys was investigated by the tensile tests, scanning electron microscopy(SEM), transmission electron microscopy(TEM), and energy dispersive X-ray spectroscopy (EDS). The results show that the mechanical properties of both alloys are improved greatly during the in situ tensile test by soaking the samples in liquid nitrogen for 10 min. The ultimate tensile strength, yield tensile strength and elongation of cryogenic treated magnesium alloy added with zirconium or manganese are largely elevated. And remarkable microstructure change is observed in both alloys by cryogenic treatment. There are a large number of twins，rod-like, tree-like and chrysanthemum-like precipitated phases in the microstructures and the fracture surfaces exhibit the characteristics of ductile rupture when they are observed at room temperature.

基金信息：the National Defense Pre-investigation Foundation of China
the National High-Tech Research and Development Program of China
the State Key Fundamental Research and Development Program of China