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首页> 美国卫生研究院文献>Materials >Effects of Bi Addition on the Microstructure and Mechanical Properties of Nanocrystalline Ag Coatings
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Effects of Bi Addition on the Microstructure and Mechanical Properties of Nanocrystalline Ag Coatings

机译：铋的添加对纳米晶Ag涂层微观结构和力学性能的影响

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摘要

In this study we investigated the effects of Bi addition on the microstructure and mechanical properties of an electrodeposited nanocrystalline Ag coating. Microstructural features were investigated with transmission electron microscopy (TEM). The results indicate that the addition of Bi introduced nanometer-scale Ag-Bi solid solution particles and more internal defects to the initial Ag microstructures. The anisotropic elastic-plastic properties of the Ag nanocrystalline coating with and without Bi addition were examined with nanoindentation experiments in conjunction with the recently-developed inverse method. The results indicate that the as-deposited nanocrystalline Ag coating contained high mechanical anisotropy. With the addition of 1 atomic percent (at%) Bi, the anisotropy within Ag-Bi coating was very small, and yield strength of the nanocrystalline Ag-Bi alloy in both longitudinal and transverse directions were improved by over 100% compared to that of Ag. On the other hand, the strain-hardening exponent of Ag-Bi was reduced to 0.055 from the original 0.16 of the Ag coating. Furthermore, the addition of Bi only slightly increased the electrical resistivity of the Ag-Bi coating in comparison to Ag. Results of our study indicate that Bi addition is a promising method for improving the mechanical and physical performances of Ag coating for electrical contacts.
机译：在这项研究中，我们研究了Bi的添加对电沉积纳米晶Ag涂层的微观结构和力学性能的影响。用透射电子显微镜（TEM）研究了微观结构特征。结果表明，Bi的引入引入了纳米级的Ag-Bi固溶体颗粒和更多的内部缺陷到最初的Ag微观结构中。通过纳米压痕实验，结合最近开发的逆方法，研究了添加和不添加铋的银纳米晶涂层的各向异性弹塑性性能。结果表明，所沉积的纳米晶Ag涂层具有较高的机械各向异性。通过添加1原子百分比（at％）的Bi，Ag-Bi涂层内的各向异性非常小，并且纳米级Ag-Bi合金在纵向和横向上的屈服强度均比纳米级的高100％以上。银另一方面，Ag-Bi的应变硬化指数从原来的0.16降到了0.055。此外，与Ag相比，Bi的添加仅稍微增加了Ag-Bi涂层的电阻率。我们的研究结果表明，添加Bi是改善电触点Ag涂层的机械和物理性能的一种有前途的方法。

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