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02-05-2023 | Original Article

Dislocation evolution and induced precipitation on corrosion resistance of a novel Al-Mg-Zn-Er-Zr alloy during hot compression

Authors: Da Xue, Wu Wei, Wei Shi, Xiao-Rong Zhou, Sheng-Ping Wen, Xiao-Lan Wu, Kun-Yuan Gao, Li Rong, Peng Qi, Hui Huang, Zuo-Ren Nie

Published in: Rare Metals | Issue 7/2023

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Abstract

Al-Mg-Zn-Er-Zr alloy was compressed in temperature range from 300 to 500 °C to investigate the microstructure evolution. Molecular dynamics simulations were used to study the mechanical behavior and dislocation evolution. The results showed that mobile dislocations are widely distributed in alloys and make important contributions to coordinate compressive deformation. The sessile dislocations hinder the deformation, and the content is about 1/20 of that of mobile dislocations. Continuous dynamic recrystallization (CDRX) is considered to be the main recrystallization mechanism. The accumulation of dislocations can provide element diffusion channels and driving force for τ (Mg₃₂[Al, Zn]₄₉) phase precipitation, resulting in the forced precipitation of discontinuous τ phase to replace the continuous β phase (Al₃Mg₂), which reduces the corrosion potential, resulting in increased corrosion resistance.

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Title: Dislocation evolution and induced precipitation on corrosion resistance of a novel Al-Mg-Zn-Er-Zr alloy during hot compression
Authors: Da Xue
Wu Wei
Wei Shi
Xiao-Rong Zhou
Sheng-Ping Wen
Xiao-Lan Wu
Kun-Yuan Gao
Li Rong
Peng Qi
Hui Huang
Zuo-Ren Nie
Publication date: 02-05-2023
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 7/2023
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-022-02258-w

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