Effect of grain size on compressive behaviour of titanium at different strain rates

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

卷:645

Article

Zhang, Shixiong¹  Wang, Ying Chun¹  Zhilyaev, Alexander P.^2,3  Korznikova, Elena²  Li, Shukui¹  Raab, Georgy I.⁴  Langdon, Terence G.⁵ 

[1] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China

[2] Russian Acad Sci, Inst Problems Met Superplast, Ufa 450001, Russia

[3] St Petersburg State Polytech Univ, Res Lab Mech New Nanomat, St Petersburg 195251, Russia

[4] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 450000, Russia

[5] Univ Southampton, Mat Res Grp, Fac Engn & Environm, Southampton SO17 1BJ, Hants, England

关键词: Compressive deformation;    Flow softening;    Grain size effects;    Strain rate sensitivity;    Titanium;   

DOI  :  10.1016/j.msea.2015.08.031

来源: Elsevier

【 摘 要 】

An investigation was conducted to evaluate the dependence on grain size of the compressive deformation of commercial purity (CP) Ti. Tests were performed at room temperature using grain sizes from coarse-grained CG (20 mu m) to ultrafine-grained UFG (500 nm) and nanocrystalline NC (90 nm) with testing strain rates in the range from 0.01 to 10 s(-1). The results show the flow stress and the strain rate sensitivity of CP Ti increase with decreasing grain size. Work hardening dominates at all strain rates in CG Ti but it balances with flow softening at 0.01 and 0.1 s(-1) in UFG and NC Ti and there is obvious flow softening in these two materials at 10 s(-1). (C) 2015 Elsevier B.V. All rights reserved.

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