2011•Cailiao rechuli xuebaoRequires access
Effects of heat treatment on microstructure and properties of Zn-1.1Cu-0.5Bi alloy
Wang Li
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Abstract
Effects of heat treatment on microstructure and properties of a free-cutting deformation Zn-1.1Cu-0.5Bi alloy were investigated by means of mechanical tests,optical microscopy,scanning electron microscopy,X-ray diffraction and machinability tests.The results show that the heat treatment process of heating at 350 ℃ for 30 min is recommended to improve the strength and hardness of Zn-1.1Cu-0.5Bi alloy based on experiments.The alloy has more homogeneous microstructure after heat treatment at 350 ℃ for 30 min than that in extruded condition,but accompanying with significant grain growth.Compare with the extruded condition,yield strength of the alloy decreases slightly after heat treatment,the tensile strength increases by 11.7%,and the elongation is slight decrease.The machinability of Zn-1.1Cu-0.5Bi alloy is best in the cast condition,and it becomes slightly worse in the extruded and heat-treated conditions.Heat treatment can not improve the machinability of Zn-1.1Cu-0.5Bi alloy obviously.