Materials Transactions Online

Materials Transactions, Vol.57 No.12 (2016) pp.2139-2145
© 2016 The Japan Institute of Metals and Materials

Consolidation Behaviors of FeB-25Ni Powders in Spark Sintering and Mechanical Properties of Their Compacts

Shaoming Kang1, Zhefeng Xu1, Yong Bum Choi1, Kazuhiro Matsugi1, Hideaki Kuramoto2 and Jinku Yu3

1Department of Mechanical Materials Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
2Hiroshima City Industrial Promotion Center, Hiroshima 730-0052, Japan
3State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China

25 vol% Ni electroless-plated FeB powders were consolidated by spark sintering for the development of hard materials. The sintering curves of the FeB-25Ni powders were between those of as-received FeB without Ni addition and pure Ni powders. The maximum densification rate in the FeB-25Ni was achieved at an apparent relative density of 0.79, which was higher than that of the as-received FeB (0.6) and close to that of pure Ni (0.74). The densification of FeB-25Ni was predominantly a result of plastic deformation and power-law creep deformation of the Ni binder. The change in densification mechanism occurred roughly at the maximum densification rate. The sintering curve and densification rate of the FeB-25Ni powders could be explained by the combination of sintering curve and densification rate obtained from the as-received FeB and pure Ni powders. The increase in maximum holding temperature led to the improvement in hardness and compressive and fracture toughness properties, which resulted from the increase in apparent relative density due to the activation of diffusion at the interfaces between particles.

[doi:10.2320/matertrans.M2016265]

(Received 2016/07/22; Accepted 2016/09/28; Published 2016/11/25)

Keywords: iron borides, environmentally friendly materials, densification mechanism, low sinter-ability

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