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Open AccessArticle

An Evaluation of a Borided Layer Formed on Ti-6Al-4V Alloy by Means of SMAT and Low-Temperature Boriding

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Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China
2
Department of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Daolun Chen
Materials 2016, 9(12), 993; https://doi.org/10.3390/ma9120993
Received: 6 October 2016 / Revised: 23 November 2016 / Accepted: 25 November 2016 / Published: 8 December 2016
In this paper, a nanocrystalline surface layer without impurities was fabricated on Ti-6Al-4V alloy by means of surface mechanical attrition treatment (SMAT). The grain size in the nanocrystalline layer is about 10 nm and grain morphology displays a random crystallographic orientation distribution. Subsequently, the low-temperature boriding behaviors (at 600 °C) of the SMAT sample, including the phase composition, microstructure, micro-hardness, and brittleness, were investigated in comparison with those of coarse-grained sample borided at 1100 °C. The results showed that the boriding kinetics could be significantly enhanced by SMAT, resulting in the formation of a nano-structured boride layers on Ti-6Al-4V alloy at lower temperature. Compared to the coarse-grained boriding sample, the SMAT boriding sample exhibits a similar hardness value, but improved surface toughness. The satisfactory surface toughness may be attributed to the boriding treatment that was carried out at lower temperature. View Full-Text
Keywords: Ti-6Al-4V alloy; SMAT; low-temperature boriding; hardness; toughness Ti-6Al-4V alloy; SMAT; low-temperature boriding; hardness; toughness
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MDPI and ACS Style

Yao, Q.; Sun, J.; Fu, Y.; Tong, W.; Zhang, H. An Evaluation of a Borided Layer Formed on Ti-6Al-4V Alloy by Means of SMAT and Low-Temperature Boriding. Materials 2016, 9, 993.

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