TEM observation of annealing microstructure of deformed Al-Mg-Sc-Zr alloy

Acta Metall Sin

2005, Vol. 41

Issue (11): 1150-1154 DOI:

Research Articles

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TEM observation of annealing microstructure of deformed Al-Mg-Sc-Zr alloy

ZHAO Weitao; YAN Desheng; RONG Lijian

Institute of Metal Research; The Chinese Academy of Sciences

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ZHAO Weitao; YAN Desheng; RONG Lijian. TEM observation of annealing microstructure of deformed Al-Mg-Sc-Zr alloy. Acta Metall Sin, 2005, 41(11): 1150-1154 .

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Abstract Al-6Mg-0.4Mn-0.2Sc-0.1Zr-0.1Cr(mass fraction, %) alloy was prepared by vacuum induction melting, and the microstructures and mechanical properties of cold worked samples annealed at 350, 400, 450 and 500℃ for 1 h were investigated. TEM observation indicated that tangled dislocation cells are typical microstructure in cold worked sample; After 350℃ annealing, the dislocations arrange regularly and the density decreases sharply, the alloy recovers partly and the grain size is about 500 nm; Further annealing to 500℃, recrystallization proceeds gradually in a wide temperature range due to the Zener drag effect of Al3(Sc, Zr) phase . As a result, the mechanical property changes greatly at 350℃ but keeps steady with further temperature increasing.

Key words: Al-Mg base alloy annealing temperature Al3(Sc Zr)

Received: 30 June 2005

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2005/V41/I11/1150

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