High strength and large ductility of existing Mn-containing brass alloys need to be further improved when used as slippers of friction-pair materials, which could be achieved by tuning alloy composition and thermomechanical treatments appropriately. The present work optimized the amount of minor-alloying elements M (M = Mn, Fe, Si) in Cu-Zn alloy via a cluster formula approach and then investigated the microstructural evolution of the designed alloy with different thermomechanical treatments. As-cast alloy ingots were solid-solutioned at 1093 K (820 °C) for 3 h, hot-rolled at 923 ~ 1023 K (650 ~ 750 °C), and then aged at 673 ~ 723 K (400 ~ 450 °C) for 1 ~ 2 h, respectively. It is found that the alloy matrix consists of the main FCC-α phase plus a small amount of BCC-β and M₅Si₃ phases, among which the M₅Si₃ exhibits three types of primary, fine, and nano-scaled particles. The mechanical property varies with the thermomechanical treatments due to diverse microstructures (especially the morphology of M₅Si₃ particles), in which the high strength (σ_UTS > 580 MPa) and large ductility (δ = 16.3 ~ 29.4%) could be achieved simultaneously in 673 K (400 °C). The optimal matching of high strength and large ductility makes the current alloy more suitable as an alternative slipper material. The strengthening effect was further discussed in light of various strengthening mechanisms, and the calculated strength increment is well consistent with the experimentally measured yield strength.

现有含锰黄铜合金作为摩擦副材料的滑块需要进一步提高其高强度和大延展性，这可以通过适当调整合金成分和热机械处理来实现。本工作通过簇公式方法优化了 Cu-Zn 合金中微量合金元素 M（M = Mn、Fe、Si）的含量，然后研究了不同热机械处理设计合金的显微组织演变。铸态合金锭在 1093 K（820°C）下固溶 3 h，在 923～1023 K（650～750°C）下热轧，然后在 673～723 K（400～450°C）下时效C) 分别为 1~2 h。发现合金基体由主要的 FCC-α 相和少量 BCC-β 和 M ₅ Si _{3 组成}相，其中 M ₅ Si ₃表现出三种类型的初级粒子、细小粒子和纳米级粒子。由于不同的微观结构（尤其是 M ₅ Si ₃颗粒的形态），力学性能随热机械处理而变化，其中可以获得高强度（σ _UTS > 580 MPa）和大延展性（δ = 16.3 ~ 29.4%）同时在 673 K (400 °C) 中。高强度和大延展性的最佳匹配，使目前的合金更适合作为替代拖鞋材料。根据各种强化机制进一步讨论了强化效果，计算的强度增量与实验测量的屈服强度非常一致。