微量元素Cd对锡基轴承合金SnSb11Cu6组织与力学性能的影响

Effects of micro-adding Cd on microstructure and mechanical properties of SnSb11Cu6 tin-based bearing alloy

为了改善锡基轴承合金的承载能力,采用X射线衍射分析、光学显微分析、硬度分析和材料拉伸和压缩试验等分析技术研究微量元素Cd对锡基轴承合金Sn Sb11Cu6的微观组织和力学性能的影响。结果表明:Cd加入合金后,并未改变合金的物相组成。合金中硬质相Sn Sb尺寸减小,数目增多,说明Cd能起到细化Sn Sb相的作用,增强合金的硬度、强度和塑性;同时,Cd溶于Sn形成固溶体能提高合金的硬度和强度,但降低合金的塑性。Cd加入到合金Sn Sb11Cu6中,起到细晶强化和固溶强化的作用。当Cd的含量在0.5%(质量分数)左右时,合金的硬度、强度和塑性同时增加,考虑合金的综合性能,推荐优选的Cd含量为0.5%~1.0%。

In order to improve the load capacity of tin-based bearing alloys, this paper investigated the effects of micro-additive Cd on the microstructure and mechanical properties of SnSb11 Cu6 tin-based bearing alloy were investigated by X-ray diffractometry, optical microscopy, hardness analysis, tensile and compressive test and other analysis techniques.The results indicate that the addition of Cd does not change the phases of the alloy, whereas it can decrease the size and increase the number of SnSb hard grains, indicating that Cd has an effect on refining SnSb phase,and further increases the hardness, strength, and plasticity of SnSb11 Cu6. Meanwhile, the formation of solid solution(Cd in Sn) improves the hardness and strength of the alloy, whereas reduces the plasticity of SnSb11 Cu6. When the content of Cd is about 0.5%(mass fraction), the hardness, strength, and plasticity of the alloy increase. Considering the comprehensive performance of the alloy, the priority content of Cd is about 0.5%-1.0%.