Effects of Sn, Si, and Cu addition on the microstructure and properties of hypermonotectic Al92Bi8 alloy
Effects of Sn, Si, and Cu addition on the microstructure and properties of hypermonotectic Al92Bi8 alloy
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Sn、Si、Cu添加对超偏晶Al92Bi8合金组织与性能的影响
DOI：
10.1016/j.msea.2019.04.016
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发表时间：
2019-05
期刊：
影响因子：
6.4
通讯作者：
Wang Zhiming
中科院分区：
文献类型：
--
作者：
Yang Qiang;Sun Zhiping;Wang Zhiming
Al单键Bi合金是一种很有潜力的无铅滑动轴承合金。由于其相分离和偏析的特点，这些合金的多组分设计是具有挑战性的。在本研究中，我们向超单元素Al 92 Bi 8合金中添加少量的Sn、Si和Cu，并研究其低合金化机制。Sn对Al 92 Bi 8合金中的富Bi相有细化作用。(Sn)相通过三元共晶反应形成并分布在富Bi相中。虽然Si和Cu使富Bi相严重粗化，但添加1wt%的Si和Cu显著改善了Al 92 Bi 8合金的机械性能。Si的强化作用导致（Si）相在富Al基体中的形成（通过三元单轴反应）和分布。在Al_（92）Bi_（8）中，Cu含量为1wt%时，不足以形成三元单金属化反应。在冷却过程中，从富Al基体中沿着固溶线析出细小的θAl2Cu相。θAl2Cu相的析出和Cu的固溶强化是Al92Bi8合金强化的主要原因。Sn、Si和Cu的复合添加可以实现Sn的细化作用和Cu、Si的强化作用。
Alsingle bondBi alloys are potential lead-free sliding bearing alloys. Owing to their phase separation and segregation characteristics, the multicomponent designing of these alloys is challenging. In this study, we added small amounts of Sn, Si, and Cu to a hypermonotectic Al92Bi8alloy and investigated its low alloying mechanism. Sn had a refining effect on the Bi-rich phase of the Al92Bi8alloy. (Sn) phase forms and distributes in the Bi-rich phase through the ternary eutectic reaction. Although Si and Cu coarsened the Bi-rich phase severely, the addition of 1 wt% of each of these significantly improved the mechanical properties of the Al92Bi8alloy. The strengthening effect of Si resulted in the formation (through a ternary monotectic reaction) and distribution of the (Si) phase in the Al-rich matrix. In Al92Bi8, 1 wt% Cu was not enough to form a ternary monotectic reaction. A fine θAl2Cu phase precipitated from the Al-rich matrix along the solvus during cooling. The precipitation of the θAl2Cu phase and the solution strengthening of Cu were responsible for the strengthening effect in Al92Bi8. The refining effect of Sn and the strengthening effects of Cu and Si can be realized in Al92Bi8by adding Sn, Si, and Cu together.
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