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Open AccessArticle

Achieving Ultrahigh Hardness in Electrodeposited Nanograined Ni-Based Binary Alloys

by Xiangui Zheng 1,†, Jian Hu 1,2,†, Jiongxian Li 1 and Yinong Shi 1,*
1
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2
School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China
*
Author to whom correspondence should be addressed.
These authors contributed equally.
Nanomaterials 2019, 9(4), 546; https://doi.org/10.3390/nano9040546
Received: 27 February 2019 / Revised: 26 March 2019 / Accepted: 26 March 2019 / Published: 4 April 2019
(This article belongs to the Special Issue Electrochemical Synthesis of Nanostructures and Their Applications)
Annealing hardening has recently been found in nanograined (ng) metals and alloys, which is ascribed to the promotion of grain boundary (GB) stability through GB relaxation and solute atom GB segregation. Annealing hardening is of great significance in extremely fine ng metals since it allows the hardness to keep increasing with a decreasing grain size which would otherwise be softened. Consequently, to synthesize extremely fine ng metals with a stable structure is crucial in achieving an ultrahigh hardness in ng metals. In the present work, direct current electrodeposition was employed to synthesize extremely fine ng Ni-Mo and Ni-P alloys with a grain size of down to a few nanometers. It is demonstrated that the grain size of the as-synthesized extremely fine ng Ni-Mo and Ni-P alloys can be as small as about 3 nm with a homogeneous structure and chemical composition. Grain size strongly depends upon the content of solute atoms (Mo and P). Most importantly, appropriate annealing induces significant hardening as high as 11 GPa in both ng Ni-Mo and Ni-P alloys, while the peak hardening temperature achieved in ng Ni-Mo is much higher than that in ng Ni-P. Electrodeposition is efficient in the synthesis of ultrahard bulk metals or coatings. View Full-Text
Keywords: electrodeposition; nanograined alloy; thermal stability; annealing hardening; hardness electrodeposition; nanograined alloy; thermal stability; annealing hardening; hardness
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MDPI and ACS Style

Zheng, X.; Hu, J.; Li, J.; Shi, Y. Achieving Ultrahigh Hardness in Electrodeposited Nanograined Ni-Based Binary Alloys. Nanomaterials 2019, 9, 546.

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