Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 8    August 2014

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Uniaxial compressive behavior of equal channel angular pressing Al at wide temperature and strain rate range
Zhong-bin TANG1, Tao SUO1, Bu-sheng ZHANG1, Yu-long LI1, Feng ZHAO1, Xue-ling FAN2

1. School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China;
2. School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, China

Abstract:Uniaxial compressive experiments of ultrafine-grained Al fabricated by equal channel angular pressing (ECAP) method were performed at wide temperature and strain rate range. The influence of temperature on flow stress, strain hardening rate and strain rate sensitivity was investigated experimentally. The results show that both the effect of temperature on flow stress and its strain rate sensitivity of ECAPed Al is much larger than those of the coarse-grained Al. The temperature sensitivity of ultrafine-grained Al is comparatively weaker than that of the coarse-grained Al. Based on the experimental results, the apparent activation volume was estimated at different temperatures and strain rates. The forest dislocation interactions is the dominant thermally activated mechanism for ECAPed Al compressed at quasi-static strain rates, while the viscous drag plays an important role at high strain rates.

 

Key words: ultrafine-grained materials; equal channel angular pressing; Al; mechanical behavior; strain rate sensitivity; temperature dependence; activation volume

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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