固溶-时效热处理对易切削变形Zn-10Al-1.0Cu-xBi-ySn合金组织与性能的影响

Effect of solution and aging treatment on the microstructure and properties of free-cutting deformation Zn-10Al-1.0Cu-xBi-ySn alloy

采用力学性能测试、扫描电镜、透射电镜和能谱分析技术、切削性能测试研究固溶-时效热处理工艺对自行研制的易切削变形Zn-10Al-1.0Cu-xBi-ySn合金挤压态组织与性能的影响。结果表明:为获得较佳的综合性能,该合金较佳的热处理工艺为(350℃,30 min水冷)+(100℃,12 h空冷);经过合理的热处理后,合金中的α+η胞状和粒状组织增多,层片状组织减少,合金塑性提高;热处理后该合金的抗拉强度达到327.05 MPa,伸长率为20.5%。

The effect of solution and aging treatment on the microstructure and properties of self-developed free-cutting deformation Zn-10Al-1.0Cu-xBi-ySn alloy were investigated by mechanical tests,optical microscopy,scanning electron microscopy,transmission electron microscope,energy spectrum analysis and machinability tests.The results show that better heat treatment process of free-cutting deformation Zn-10Al-1.0Cu-xBi-ySn alloy is（350 ℃,30 min） with water-cooling and（100 ℃,12 h） with air-cooling following.After a reasonable solution and aging heat treatment,the α＋η cellular and granular structure of the alloy increases,the lamellar structure reduces as well,so as the plasticity of the alloy increases.And the tensile strength and elongation of the alloy are 327.05 MPa and 20.5%,respectively.