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Title: Effects of Bi Addition on the Microstructure and Mechanical Properties of Nanocrystalline Ag Coatings

Abstract

Here 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. Lastly, results of our study indicate that Bi addition is a promising method for improving the mechanical and physical performances of Ag coating for electricalmore » contacts.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [5];  [3]
  1. Jiangsu Univ. of Science and Technology, Jiangsu (China). School of Materials Science and Engineering; Univ. of Auckland, Auckland (New Zealand). Dept. of Chemical & Materials Engineering
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical and Computational Sciences Directorate
  3. Univ. of Auckland, Auckland (New Zealand). Dept. of Chemical & Materials Engineering
  4. Jiangsu Univ. of Science and Technology, Jiangsu (China). School of Materials Science and Engineering
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1390442
Alternate Identifier(s):
OSTI ID: 1394277
Report Number(s):
PNNL-SA-126344
Journal ID: ISSN 1996-1944; VT0505000
Grant/Contract Number:  
AC05-00OR22725; AC06-76RL01830
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Materials
Additional Journal Information:
Journal Volume: 10; Journal Issue: 8; Journal ID: ISSN 1996-1944
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Nanoindentation; Bi addition; nanocrystalline Ag; microstructure; electrical conductivity; mechanical properties; electrodeposited nanocrystalline Ag; nanoindentation

Citation Formats

Wang, Yuxin, Cheng, Guang, Tay, See Leng, Guo, Yuxia, Sun, Xin, and Gao, Wei. Effects of Bi Addition on the Microstructure and Mechanical Properties of Nanocrystalline Ag Coatings. United States: N. p., 2017. Web. doi:10.3390/ma10080932.
Wang, Yuxin, Cheng, Guang, Tay, See Leng, Guo, Yuxia, Sun, Xin, & Gao, Wei. Effects of Bi Addition on the Microstructure and Mechanical Properties of Nanocrystalline Ag Coatings. United States. doi:10.3390/ma10080932.
Wang, Yuxin, Cheng, Guang, Tay, See Leng, Guo, Yuxia, Sun, Xin, and Gao, Wei. Thu . "Effects of Bi Addition on the Microstructure and Mechanical Properties of Nanocrystalline Ag Coatings". United States. doi:10.3390/ma10080932. https://www.osti.gov/servlets/purl/1390442.
@article{osti_1390442,
title = {Effects of Bi Addition on the Microstructure and Mechanical Properties of Nanocrystalline Ag Coatings},
author = {Wang, Yuxin and Cheng, Guang and Tay, See Leng and Guo, Yuxia and Sun, Xin and Gao, Wei},
abstractNote = {Here 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. Lastly, 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.},
doi = {10.3390/ma10080932},
journal = {Materials},
number = 8,
volume = 10,
place = {United States},
year = {Thu Aug 10 00:00:00 EDT 2017},
month = {Thu Aug 10 00:00:00 EDT 2017}
}

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Works referenced in this record:

An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
journal, June 1992

  • Oliver, W. C.; Pharr, G. M.
  • Journal of Materials Research, Vol. 7, Issue 06, p. 1564-1583
  • DOI: 10.1557/JMR.1992.1564