Portevin-Le Chatelier effect in Al-Zn-Mg-Cu-Zr aluminum alloy

Portevin-Le Chatelier (PLC) effect in a severely cold-rolled Al-Zn-Mg-Cu-Zr aluminum alloy (AA7055 type) plate before and after annealing was investigated. The results show that the sample annealed at 300 °C undergoes PLC effect, whereas the PLC effect is not observed in the deformed sample or the s...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2009-10, Vol.19 (5), p.1071-1075
Main Authors: CHEN, Jun-zhou, ZHEN, Liang, FAN, Li-wei, YANG, Shou-jie, DAI, Sheng-long, SHAO, Wen-zhu
Format: Article
Language:English
Subjects:
aluminum alloy
dislocation
Portevin-Le Chatelier effect
precipitation
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Summary:Portevin-Le Chatelier (PLC) effect in a severely cold-rolled Al-Zn-Mg-Cu-Zr aluminum alloy (AA7055 type) plate before and after annealing was investigated. The results show that the sample annealed at 300 °C undergoes PLC effect, whereas the PLC effect is not observed in the deformed sample or the samples annealed at 110 °C or 200 °C. The main precipitates in the sample annealed at 300 °C are the coarsened η phases, while a mixture of small η' phases and η phases dominates in the sample annealed at 200 °C. In the deformed sample and sample annealed at 110 °C, GP zone are the main precipitates. The different flow behaviors are ascribed to the type of precipitates as well as the dislocation density differences.
ISSN:1003-6326
DOI:10.1016/S1003-6326(08)60408-2