Grain refinement and high strain rate superplasticity in alumunium 2024 alloy processed by high-pressure torsion

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

卷:622

Article

Alhamidi, Ali^1,2  Horita, Zenji^1,2 

[1] Kyushu Univ, Fac Engn, Dept Mat Sci & Engn, Fukuoka 8190395, Japan

[2] Kyushu Univ, VVPI, Int Inst Carbon Neutral Energy Res WPI I2CNER, WPI, Fukuoka 8190395, Japan

关键词: Severe plastic deformation (SPD);    High-pressure torsion (HPT);    Ultrafine-grained (UFG) materials;    High strain rate superplasticity (HSRS);    Al-Cu Alloy;   

DOI  :  10.1016/j.msea.2014.11.009

来源: Elsevier

【 摘 要 】

An Al-2024 alloy was processed by high-pressure torsion (HPT) to produce an ultrafine-grained structure with a grain size of similar to 240 nm. A maximum elongation of similar to 750% was attained with an initial strain rate of 1 x 10(-2) s(-1) at 673 K, demonstrating the advent of high strain rate superplasticity through grain refinement by the HPT processing. Evaluation of the strain-rate sensitivity and the activation energy for the deformation confirmed that grain boundary sliding through grain boundary diffusion is the rate-controlling process for the superplastic deformation of the HPT-processed Al-2024 alloy. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

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