Effect of high pressure torsion process on the microhardness,microstructure and tribological property of Ti6Al4V alloy

Guanyu Deng ¹Xing Zhao ²Lihong Su ³Peitang Wei ⁴Liang Zhang ⁵Lihua Zhan ²Yan Chong ⁶Hongtao Zhu ³Nobuhiro Tsuji⁷

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作者信息

1. School of Mechanical,Materials,Mechatronic and Biomedical Engineering,University of Wollongong,NSW 2500,Australia;Department of Materials Science and Engineering,Kyoto University,Kyoto 606-8501,Japan
2. State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083,China
3. School of Mechanical,Materials,Mechatronic and Biomedical Engineering,University of Wollongong,NSW 2500,Australia
4. State Key Laboratory of Mechanical Transmissions,Chongqing University,Chongqing 400030,China
5. International Joint Laboratory for Light Alloys (MOE),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
6. Department of Materials Science and Engineering,Kyoto University,Kyoto 606-8501,Japan;Department of Materials Science and Engineering,University of California Berkeley,CA 94720,United States
7. Department of Materials Science and Engineering,Kyoto University,Kyoto 606-8501,Japan;Elements Strategy Initiative for Structural Materials (ESISM),Kyoto University,Kyoto 606-8501,Japan
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Abstract

In the present study,a fully lamellar Ti6Al4V alloy was severely deformed by high pressure torsion (HPT)process under a pressure of 7.5 GPa up to 10 revolutions.Experimental results revealed that the micro-hardness of Ti6Al4V was increased remarkably by about ～41％ and saturated at about 432 Hv after the HPT process.A relatively uniform bulk nanostructured Ti6Al4V alloy with an average grain size of about 52.7 nm was obtained eventually,and no obvious formation of metastable ω phase was detected by XRD analysis.For the first time,the tribological properties of the HPT processed Ti6Al4V alloy were investi-gated by a ball-on-disc test at room temperature under a dry condition.It was found that HPT process had a great influence on the friction and wear behaviors of Ti6Al4V alloy.With increasing the number of HPT revolutions,both friction coefficient and spedfic wear rate were obviously decreased due to the reduction of abrasion and adhesion wears.After being deformed by 10 HPT revolutions,the friction co-efficient was reduced from about 0.49 to 0.37,and the specific wear rate was reduced by about 48g.The observations in this study indicated that HPT processed Ti6Al4V alloys had good potential in structural applications owing to their greatly improved mechanical and tribological properties.

Key words

Severe plastic deformation/High pressure torsion/UFG microstructure/Mechanical property/Friction and wear/Ti6Al4V alloy

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基金项目

Australian Academy of Science(AAS)()

Japan Society for the Promotion of Science(JSPS) for awarding him an international fellowship and financial support()

Australian Research Council(ARC) for award-ing her the Discovery Early Career Researcher Award (DECRA) fellowship(DE180100124)

Cross-ministerial Strategic Innovation Promo-tion Program(SIP) from the Cabinet Office of Japanese government()

Elements Strategy Initiative for Structural Materials in Kyoto University from the Ministry of Ed-ucation(ESISM)

Elements Strategy Initiative for Structural Materials in Kyoto University from the Ministry of Ed-ucation(JPMXP0112101000)

Culture,Sports,Science and Technology (MEXT) Japan()

JST CREST from Japan Science and Technology Agency(JST)(JPMJCR1994)

Open Research Fund of State Key Laboratory of High Performance Complex Manu-facturing,Central South University in China()

use of facilities belonging to Kyoto University in Japan and University of Wollongong in Australia()

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量77

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