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Effects of Mechanical Ball Milling Time on the Microstructure and Mechanical Properties of Mo2NiB2-Ni Cermets

1
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
2
Institute of Advance Wear & Corrosion Resistant and Functional Materials, Jinan University, Jinan 510632, China
3
Instrumental Analysis Center of Xi’an Jiaotong University, Xi’an 710049, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(12), 1926; https://doi.org/10.3390/ma12121926
Received: 22 May 2019 / Revised: 12 June 2019 / Accepted: 13 June 2019 / Published: 14 June 2019
Mo2NiB2-Ni cermets have been extensively investigated due to their outstanding properties. However, studies have not systematically examined the effect of the powder milling process on the cermets. In this study, Mo, Ni, and B raw powders were subjected to mechanical ball milling from 1 h to 15 h. XRD patterns of the milled powders confirmed that a new phase was not observed at milling times of 1 h to 15 h. With the increase in the mechanical ball milling time from 1 h to 11 h, raw powders were crushed to small fragments, in addition to a more uniform distribution, and with the increase in the mechanical ball milling time to greater than 11 h, milled powders changed slightly. Mo2NiB2-Ni cermets were fabricated by reaction boronizing sintering using the milled powders at different ball milling times. The milling time significantly affected the microstructure and mechanical properties of Mo2NiB2-Ni cermets. Moreover, the Mo2NiB2 cermet powder subjected to a milling time of 11 h exhibited the finest crystal size and the maximum volume fraction of the Mo2NiB2 hard phase. Furthermore, the cermets with a milling time of 11 h exhibited a maximum hardness and bending strength of 87.6 HRA and 1367.3 MPa, respectively. View Full-Text
Keywords: powder metallurgy; ball milling; Mo2NiB2-Ni cermets; microstructure; mechanical properties powder metallurgy; ball milling; Mo2NiB2-Ni cermets; microstructure; mechanical properties
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Zhang, L.; Huang, Z.; Liu, Y.; Shen, Y.; Li, K.; Cao, Z.; Ren, Z.; Jian, Y. Effects of Mechanical Ball Milling Time on the Microstructure and Mechanical Properties of Mo2NiB2-Ni Cermets. Materials 2019, 12, 1926.

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