Pore formation mechanism of porous Ni–Cr–Al alloys prepared by elemental powder reactive synthesis

Yifeng Xiao; Yang Xu; Liang Wu; Yanfei Xu; Jinwen Qian; Xiaohua Guo; Xiaona Li; Yuehui He

doi:10.3139/146.111669

Article

Pore formation mechanism of porous Ni–Cr–Al alloys prepared by elemental powder reactive synthesis

Yifeng Xiao , Yang Xu , Liang Wu , Yanfei Xu , Jinwen Qian , Xiaohua Guo , Xiaona Li and Yuehui He

Published/Copyright: August 30, 2018

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From the journal International Journal of Materials Research Volume 109 Issue 9

Abstract

Porous Ni–Cr–Al alloy samples were fabricated by pressureless sintering of Ni, Cr, and Al elemental powders. The phase transformation, swelling behavior, pore structure parameters, microstructure, and pore formation mechanisms of porous Ni–Cr–Al alloys were systematically investigated. Results show that obvious swelling behavior occurs during sintering. The open porosity of the Ni–Cr–Al alloy increases as the sintering temperature increases below 920°C, followed by a relatively declining value for phase transformation beyond 920°C. The porous Ni–Cr–Al alloy samples exhibit an open porosity of 35.02% when sintered at 1200°C for 3 h. The main pore formation mechanisms are the Kirkendall effect and the development of interparticle pores.

Keywords: Porous Ni–Cr–Al alloy; Diffusion; Open porosity; Pore formation mechanism

*Correspondence address, Mrs. Liang Wu, School of Mechanical Engineering Xiangtan University Hunan, P. R. China, Key Laboratory of welding robot and application technology of Hunan Province Xiangtan University Xiangtan, P. R. China, Engineering Research Center of Complex Tracks Processing Technology and Equipment of Ministry of Education, Xiangtan University Xiangtan, P. R. China, E-mail: welding1236@163.com

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Received: 2017-10-31

Accepted: 2018-02-08

Published Online: 2018-08-30

Published in Print: 2018-09-14

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https://doi.org/10.3139/146.111669

Keywords for this article

Porous Ni–Cr–Al alloy; Diffusion; Open porosity; Pore formation mechanism