Abnormal grain growth in randomly-oriented fine grains in an Al–Mg–Sc–Zr alloy processed by laser-powder-bed-fusion

Autor: Yanchi Chen, Xiang Chen, Han Chen, Yakai Xiao, Jing Dai, Yidan Chen, Yuchi Cui, Chengyi Dan, Zhe Chen, Xianfeng Li, Haowei Wang
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Materials Research Letters, Vol 12, Iss 9, Pp 635-643 (2024)
Druh dokumentu: article
ISSN: 21663831
2166-3831
DOI: 10.1080/21663831.2024.2366878
Popis: In this work, we report a counter-intuitive activation of abnormal grain growth (AGG) in randomly-oriented fine grains (FGs) in an L-PBF Al–Mg–Sc–Zr alloy, which is unlikely from perspectives of curvature-driven grain growth, crystallographic texture or strain-induced boundary migration. The observed spontaneous AGG is understood in light of the growth instability of an arbitrary grain in an evolving particle-pinned polycrystalline aggregation. A generalized criterion for AGG is hence proposed, which efficaciously explains the observed susceptibility of FGs to AGG, the presence of multiple AGG activation sites, and the asynchrony of AGG activation.
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