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Research Article

Microstructure evaluation and thermal deformation behaviours of wrought magnesium alloys

, ORCID Icon, , , &
Pages 283-299 | Received 09 Mar 2022, Accepted 30 Jul 2022, Published online: 11 Aug 2022
 

Abstract

Due to the large orientation gradient, the dynamic recrystallisation of Mg–Zn–Nd–Zr wrought alloy occurred first around grain boundaries. The Nd-rich second phase promoted the nucleation of recrystallisation. With the increasing strain, more non-basal plane slip occurred near the grain boundary, which caused the adjacent subgrain boundary merging into a high angle grain boundary. In addition, some twin intersecting regions gathered high-density dislocation, leading to twin dynamic recrystallisation. By deducing the stress–strain constitutive relation during thermal deformation and analysing the relation between the apparent value of constant creep exponent (n) and the corresponding deformation mechanism, the dominant mechanism of dislocation sliding and climbing during dynamic recrystallisation was deduced backwards.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Key Research and Development Program [grant number 2021YFB3701100]; the Research Funds for the Central Universities [grant number 2022CDJKYJH028]; the Chongqing Research Program of Basic Research and Frontier Technology [grant number cstc2019jcjy-msxmX0539]; the Natural Science Foundation of Guangxi [grant number 2022GXNSFAA035531]; the Guangxi Special Program for Young Talents [grant number Guike AD21220158].

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