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. 20    No. 11    November 2010

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Strengthening and stress drop of ultrafine grain aluminum after annealing
REN Jiang-wei(任江伟)1, SHAN Ai-dang(单爱党)2

1. School of Materials Engineering, Shanghai University of Engineering Science, Shanghai 200126, China;
2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Abstract:Ultrafine grain pure aluminum was produced by equal channel angular pressing and cold rolling, the deformed aluminum was annealed at 200 °C for 1 h. The tensile curves of deformed and annealed aluminum show that yield strength of deformed aluminum increases by 100%−300% and its elongation decreases by about 20%. After low temperature annealing, strength of annealed aluminum increases by 20% and elongation decreases by over 50%, the recovery of dislocations may be the main cause of annealing strengthening. In addition, there is an abrupt stress drop in the tensile curves of annealed aluminum and the formation of shear band is responsible for it.

 

Key words: aluminum; ultrafine grain; mechanical properties; heat treatment

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

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

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