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Microstructures and mechanical properties of bulk nanocrystalline silver fabricated by spark plasma sintering

Published online by Cambridge University Press:  10 June 2016

Hu Wang ,
Xing-Wang Cheng ,
Zhao-Hui Zhang ,
Zheng-Yang Hu  and
Sheng-Lin Li
Hu Wang
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
Xing-Wang Cheng
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China; and National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing, 100081, People's Republic of China
Zhao-Hui Zhang*
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China; and National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing, 100081, People's Republic of China
Zheng-Yang Hu
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
Sheng-Lin Li
Affiliation:
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, People's Republic of China
*
a) Address all correspondence to this author. e-mail: zhang@bit.edu.cn
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Abstract

Bulk nanocrystalline (NC) silvers were fabricated by spark plasma sintering process. The effects of sintering temperature on physical and mechanical properties of the NC silvers were investigated. The results indicate that no impurities were introduced into the bulk compacts during the preparation procedure. Both the density and the electrical conductivity of the NC Ag increase with an increase in sintering temperature. However, the micro-hardness and ultimate tensile strength (UTS) of the bulk compacts increase initially and then decrease with increasing sintering temperature. The NC Ag sintered at 500 °C exhibits the highest micro-hardness of 85.3 HV along with the best compression yield strength of 379 MPa and the highest UTS of 534 MPa. The deterioration of the mechanical properties of the NC Ag sintered at 550 °C should be attributed to the rapid grain growth.

Keywords

Agsinteringmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 15 , 15 August 2016 , pp. 2223 - 2232
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Copyright
Copyright © Materials Research Society 2016 

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