(1. 重慶躍進(jìn)機(jī)械廠有限公司，重慶 402169；
2. 上海交通大學(xué) 機(jī)械與動(dòng)力工程學(xué)院，上海 200240)
摘 要: 為了改善錫基軸承合金的承載能力，采用X射線衍射分析、光學(xué)顯微分析、硬度分析和材料拉伸和壓縮試驗(yàn)等分析技術(shù)研究微量元素Cd對(duì)錫基軸承合金SnSb11Cu6的微觀組織和力學(xué)性能的影響。結(jié)果表明：Cd加入合金后，并未改變合金的物相組成。合金中硬質(zhì)相SnSb尺寸減小，數(shù)目增多，說(shuō)明Cd能起到細(xì)化SnSb相的作用，增強(qiáng)合金的硬度、強(qiáng)度和塑性；同時(shí)，Cd溶于Sn形成固溶體能提高合金的硬度和強(qiáng)度，但降低合金的塑性。Cd加入到合金SnSb11Cu6中，起到細(xì)晶強(qiáng)化和固溶強(qiáng)化的作用。當(dāng)Cd的含量在0.5%(質(zhì)量分?jǐn)?shù))左右時(shí)，合金的硬度、強(qiáng)度和塑性同時(shí)增加，考慮合金的綜合性能，推薦優(yōu)選的Cd含量為0.5%~1.0%。
關(guān)鍵字: Cd；SnSb11Cu6；顯微組織；力學(xué)性能；強(qiáng)化機(jī)理
（1. Chongqing Yuejin Machinery Co., Ltd., Chongqing 402169, China;
2. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract: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 SnSb11Cu6 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 SnSb11Cu6. Meanwhile, the formation of solid solution (Cd in Sn) improves the hardness and strength of the alloy, whereas reduces the plasticity of SnSb11Cu6. 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%.
Key words: Cd; SnSb11Cu6; microstructure; mechanical property; strengthening mechanism
