Characteristics of grain refinement in oxygen-free copper processed by equal-channel angular pressing and dynamic testing

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

卷:775

Article

Alawadhi, Meshal Y.¹  Sabbaghianrad, Shima^2,3  Wang, Ying Chun⁴  Huang, Yi^5,6  Langdon, Terence G.⁶ 

[1] PAAET, Dept Mfg Engn, Coll Technol Studies, POB 42325, Shuwaikh 70654, Kuwait

[2] Univ Southern Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA

[3] Univ Southern Calif, Dept Mat Sci, Los Angeles, CA 90089 USA

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

[5] Bournemouth Univ, Fac Sci & Technol, Dept Design & Engn, Poole BH12 5BB, Dorset, England

[6] Univ Southampton, Dept Mech Engn, Mat Res Grp, Southampton SO17 1BJ, Hants, England

关键词: Copper;    Dynamic testing;    Equal-channel angular pressing;    High strain rates;    Severe plastic deformation;   

DOI  :  10.1016/j.msea.2020.138985

来源: Elsevier

【 摘 要 】

Oxygen-free copper was processed by equal-channel angular pressing (ECAP) at room temperature for 1, 4 and 8 passes and then the ECAP specimens were further deformed by dynamic testing at 298 K using a strain rate of 10 s(-1). Experiments were conducted to investigate the influence of the initial microstructures induced by ECAP on the subsequent grain refinement and mechanical properties after dynamic testing. The results show the strength of copper increased with increasing numbers of ECAP passes and a significant additional grain refinement was produced in the ECAP specimens through the dynamic testing. Thus, the initial grain sizes after ECAP for 1, 4 and 8 passes were similar to 16, similar to 4.4 and similar to 2.9 mu m, respectively, and these values were reduced to similar to 400, similar to 330 and similar to 300 nm by dynamic testing, The grains were refined by conventional dislocation processes in the 1-pass specimen but there was evidence for dynamic recrystallization in the specimen processed by 8 passes.

【 授权许可】

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