Wang Zhaojie, Zhang Guowei, Kang Yuanyuan, Liu Yijun, Ren Xiaoyan
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China.
Department of Mechanical Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China.
Materials (Basel). 2022 Jan 29;15(3):1047. doi: 10.3390/ma15031047.
We studied the effects of adding Y on the microstructure, mechanical properties and wear properties of ZCuSn10Pb10, and clarified the underlying mechanism by microstructure characterization through SEM, EDS and XRD. No new phase was detected after the addition of Y up to 0.2 wt.%, but an enrichment of Y in the Pb phase was found. The Pb particles were refined significantly after the addition of Y, which resulted from the compositional undercooling for the Cu dendrite where the Pb particles solidified, and the highest refinement efficiency was reached when the content of Y was 0.15 wt.%. The hardness of the alloy was improved due to the refinement of the microstructure. The fine Pb particles between the dendrite branches acted as solid lubricant, which was smeared on the entire surface during a friction and wear experiment, thus increasing wear resistance and reducing the coefficient of friction.
我们研究了添加Y对ZCuSn10Pb10的微观结构、力学性能和磨损性能的影响，并通过扫描电子显微镜（SEM）、能谱仪（EDS）和X射线衍射仪（XRD）进行微观结构表征，阐明了其潜在机制。添加Y的含量高达0.2 wt.%后，未检测到新相，但发现Y在Pb相中富集。添加Y后，Pb颗粒显著细化，这是由于Pb颗粒凝固时Cu枝晶的成分过冷导致的，当Y含量为0.15 wt.%时，细化效率最高。由于微观结构的细化，合金的硬度得到提高。枝晶间的细小Pb颗粒起到了固体润滑剂的作用，在摩擦磨损实验中涂抹在整个表面，从而提高了耐磨性并降低了摩擦系数。
