| 何秋梅,侯建明.机械合金化Cu-Sn-Bi合金的烧结行为与力学性能[J].有色金属材料与工程,2026,47(3):1-6. |
| 机械合金化Cu-Sn-Bi合金的烧结行为与力学性能 |
| Sintering behavior and mechanical properties of Cu-Sn-Bi alloy prepared by mechanical alloying |
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| DOI：10.13258/j.cnki.nmme.20260609001 |
| 中文关键词: 机械合金化 Cu-Sn-Bi 过饱和固溶体 烧结行为 力学性能 摩擦学性能 |
| 英文关键词:mechanical alloying Cu-Sn-Bi supersaturated solid solution sintering behavior mechanical properties tribological performance |
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| 中文摘要: |
| 基于机械合金化制备的Cu-Sn-Bi过饱和固溶体粉末，系统研究了其烧结工艺、相析出行为、微观组织演变及力学性能，并通过Bi和Sn含量对比实验，分别明确了Bi对微观组织的调控规律和Sn固溶强化的作用。结果表明：Cu-10%Sn-5%Bi球磨40 h后形成Cu（Sn, Bi）过饱和固溶体；烧结过程中Sn始终保持固溶态，Bi在约400 ℃开始从过饱和固溶体中脱溶析出，形成弥散分布的游离Bi相，确定最佳烧结温度为750 ℃。微观组织随Bi含量增加而演变：3%时Bi相少量弥散，5%时呈均匀细小颗粒，7%时局部连通并割裂基体。Cu-10%Sn-5%Bi合金在750 ℃烧结后致密度为92.8%，硬度116 HV，拉伸强度164.4 MPa。Sn含量对比实验表明，高Sn合金具有更低的摩擦系数和更平整的磨损表面。 |
| 英文摘要: |
| Based on the Cu-Sn-Bi supersaturated solid solution powders prepared by mechanical alloying, this study systematically investigates the sintering process, phase precipitation behavior, microstructural evolution, and mechanical properties. Through comparative experiments with varying Bi and Sn contents, the regulatory effect of Bi on the microstructure and the role of Sn solid-solution strengthening are clarified. The results show that after 40 h of ball milling, the Cu-10%Sn-5%Bi powder forms a Cu(Sn, Bi) supersaturated solid solution. During sintering, Sn remains in a solid-solution state, while Bi precipitates from the supersaturated solid solution at about 400 ℃, forming a finely dispersed free Bi phase. The optimal sintering temperature is 750 ℃. With increasing Bi content, the microstructure evolves as follows: at 3% Bi, the Bi phase is finely and sparsely dispersed; at 5% Bi, it distributes uniformly as fine particles; at 7% Bi, it becomes locally interconnected and splits the matrix. After sintering at 750 ℃, the Cu-10%Sn-5%Bi alloy achieves a relative density of 92.8%, a hardness of 116 HV, and a tensile strength of 164.4 MPa. Sn content comparison experiments show that the higher Sn alloy exhibits a lower friction coefficient and a smoother worn surface. |
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