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Materials 2016, 9(12), 993;

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

Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China
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
Received: 6 October 2016 / Revised: 23 November 2016 / Accepted: 25 November 2016 / Published: 8 December 2016
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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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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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