Strain uniformity footprint on mechanical performance and erosion-corrosion behavior of equal channel angular pressed pure titanium

Results in Physics

Q.D. Wang¹  F.A. Al-Mufadi²  F. Djavanroodi³  Sh. Attarilar⁴  O.M. Irfan⁵  M. Ebrahimi⁶ 

[1] Mechanical Engineering Department, Beni Suef University, Beni-Suef 62764, Egypt;Mechanical Engineering Department, Imperial College, London SW7 2AZ, UK;State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai, China;Department of Pediatric Orthopaedics, Xinhua Hospital Affiliated to Shanghai Jiao Tong University, School of Medicine, Shanghai, China;Mechanical Engineering Department, Prince Mohammad Bin Fahd University, Al Khobar 31952, Saudi Arabia;Mechanical Engineering Department, Qassim University, Buraidah 51452, Saudi Arabia;

关键词: Severe plastic deformation;    Grain refinement;    Tensile properties;    Hardness distribution;    Erosion-corrosion resistance;    Material homogeneity;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this paper, the effect of equal channel angular pressing (ECAP) on microstructure, mechanical, and erosion-corrosion behavior of commercial pure (CP) titanium was investigated through experimental work. Four passes of ECAP processing at 400 ℃ was performed on CP titanium. The results showed that the homogeneous structure and coarse equiaxed grains of the initial annealed sample are transformed into the combination of UFG and NS with an average size of 750 nm and 85 nm, respectively. Also, ECAP pass numbers increase the fraction of high angle grain boundaries which improves the ductility of the processed sample. The highest hardness and strength improvement rate was observed after the first pass. Furthermore, the increasing rate of hardness and strength is gradually decreased at the subsequent passes and reached the steady-state level at the 4th pass. This is due to the balance between hardening by dislocations and twinnings accumulation and softening by recovery mechanisms. As a result, a uniform hardness distribution on both the cross-sectional and longitudinal planes is achieved. It was confirmed that erosion-corrosion resistance of the processed sample is enhanced due to the grain refinement, material homogeneity, and quick formation of a strong oxide bond layer on the surface.

【 授权许可】

Unknown