Mechanical properties and microstructure of a Ti-6A1-4V alloy subjected to cold rolling, asymmetric rolling and asymmetric cryorolling

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:710

Article

Yu, Hailiang^1,2,3,4  Yan, Ming⁵  Li, Jintao⁴  Godbole, Ajit⁴  Lu, Cheng⁴  Tieu, Kiet⁴  Li, Huijun⁴  Kong, Charlie⁶ 

[1] Cent S Univ, State Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China

[2] Cent S Univ, Sch Mech & Elect Engn, Changsha 410083, Hunan, Peoples R China

[3] Xian Univ Architecture & Technol, Sch Met Engn, Xian 710055, Shaanxi, Peoples R China

[4] Univ Wollongong, Sch Mech Mat & Mechatron Engn, Wollongong, NSW 2500, Australia

[5] South Univ Sci & Technol China, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

[6] Univ New South Wales, Electron Microscope Unit, Sydney, NSW 2052, Australia

关键词: Ti-6A1-4V alloy;    Asymmetric rolling;    Cryorolling;    Mechanical property;    Microstructure;   

DOI  :  10.1016/j.msea.2017.10.075

来源: Elsevier

【 摘 要 】

The mechanical properties of the Ti-6Al-4V alloy are significantly determined by the process used for manufacture. In this study, the mechanical properties of the Ti-6Al-4V alloy manufactured using cold rolling, asymmetric rolling and asymmetric cryorolling were characterized by subjecting it to the tensile test and the microhardness test. The evolution in the microstructure was studied using scanning electron microscopy, transmission electron microscopy as well as energy dispersive X-ray spectrometry. Results show that the Ti-6Al-4V alloy sheets subjected to asymmetrical cryorolling with low rolling speed ratio between the upper and lower rolls have the highest tensile strength and microhardness. The tensile stress of the alloy samples after cold rolling was found to be 1008 MPa, 1046 MPa after asymmetric rolling, and 1113 MPa after asymmetric cryorolling. The highest Vickers hardness (HV395) is achieved by asymmetric cryorolling. We discuss the mechanical behavior using the criteria of grain size, size of second phase as well as dislocation density.

【 授权许可】

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