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:	Additive manufacturing Al–Mg–Sc–Zr alloy abnormal grain growth Zener pinning Materials of engineering and construction. Mechanics of materials TA401-492
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.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/0245335780f047f3b6f5e0ca5dfdcfc9 Zobrazit plný text záznamu View record in DOAJ