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Effect of external stress on the microstructure and mechanical properties of creep-aged Al-Cu-Li-Ag alloy.
Jiang, Dandan; Yang, Ruibin; Wang, Defa; Liu, Zhongxia.
Afiliação
  • Jiang D; Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan Province, 450052, China.
  • Yang R; School of Basic Science, Zhengzhou University of Technology, Zhengzhou, Henan Province, 450052, China. Electronic address: Yang_Ruibin@163.com.
  • Wang D; Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan Province, 450052, China.
  • Liu Z; Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, Henan Province, 450052, China. Electronic address: liuzhongxia@zzu.edu.cn.
Micron ; 143: 103011, 2021 Apr.
Article em En | MEDLINE | ID: mdl-33524915
ABSTRACT
The effects of external stress on the precipitation of T1 precipitates and mechanical properties of creep-aged Al-Cu-Li-Ag alloys are investigated. Promotion mechanisms of external stress to the precipitation of T1 precipitates are discussed. It is found that external stress significantly promotes the precipitation and improves the distribution of the T1 precipitates in the creep-aged alloys. There is a threshold stress, close to the yield stress, that has only a limited promotion effect on the precipitation of T1 precipitates. The external stress below and above the threshold stress promotes the precipitation of T1 precipitates by two different mechanisms. One is the promotion mechanism of lattice distortion produced by the elastic stress. Another is the promotion mechanism of multiplication of dislocations produced by the plastic stress. Both elastic and plastic external stress can synergistically improve the strength and ductility. Especially, the plastic external stress resulted in the best improvement to ductility of creep-aged alloys. Hence, the creep ageing with plastic external stress is an alternative method to synergistically improve the strength and ductility of Al-Cu-Li-Ag alloys. However, it is necessary to avoid using excessive plastic stress for the creep ageing because it may cause creep damage and degrade its mechanical properties.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Micron Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2021 Tipo de documento: Article País de afiliação: China País de publicação: ENGLAND / ESCOCIA / GB / GREAT BRITAIN / INGLATERRA / REINO UNIDO / SCOTLAND / UK / UNITED KINGDOM

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Micron Assunto da revista: DIAGNOSTICO POR IMAGEM Ano de publicação: 2021 Tipo de documento: Article País de afiliação: China País de publicação: ENGLAND / ESCOCIA / GB / GREAT BRITAIN / INGLATERRA / REINO UNIDO / SCOTLAND / UK / UNITED KINGDOM