Pd-Ag-Sn-In-Zn合金时效强化机制研究

Age-Hardening Mechanism of Pd-Ag-Sn-In-Zn Alloy

通过硬度测试、X射线衍射(XRD)分析、扫描电镜(SEM)观察研究了Pd-Ag-Sn-In-Zn合金时效强化行为及相关的微观结构变化,从而很好地解释了该合金的时效强化机制。结果表明,时效前期合金硬度的增加与在晶界处形成中间过渡相有关。通过扫描电镜观察,可以清楚地看到基体相以及等温时效过程中在晶界处有类似珠光体的析出相。随着稳定第二相的长大,硬度持续下降。

Age-hardening behaviour and the related microstructural changes were studied to elucidate the hardening mechanism of Pd-Ag-Sn-In-Zn alloy by means of hardness test, XRD, SEM. It is shown that the increase of hardness during the early stage of age-hardening is related to the formation of intermediate precipitate phase at the grain boundary. The single phase solid solution matrix and the lameUar-like precipitate phase similar to pearlite were observed at the grain boundary by SEM. The hardness is decreasing with the coarsening of the stable second phase.