Segregation-driven grain boundary spinodal decomposition as a pathway for phase nucleation in a high-entropy alloy

doi:10.1016/j.actamat.2019.07.052

IMR OpenIR

	Segregation-driven grain boundary spinodal decomposition as a pathway for phase nucleation in a high-entropy alloy
	Li, Linlin 1,2; Li, Zhiming 1; da Silva, Alisson Kwiatkowski 1; Peng, Zirong 1; Zhao, Huan 1; Gault, Baptiste 1,3; Raabe, Dierk 1
通讯作者	Li, Linlin(l.li@mpie.de) ; Raabe, Dierk(d.raabe@mpie.de)
	2019-10-01
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	178 页码:1-9
摘要	Elemental segregation to grain boundaries (GBs) can induce structural and chemical transitions at GBs along with significant changes in material properties. The presence of multiple principal elements interacting in high-entropy alloys (HEAs) makes the GB segregation and interfacial phase transformation a rather challenging subject to investigate. Here, we explored the temporal evolution of the chemistry for general high-angle GBs in a typical equiatomic FeMnNiCoCr HEA during aging heat treatment through detailed atom probe tomography (APT) analysis. We found that the five principal elements segregate heterogeneously at the GBs. More specifically, Ni and Mn co-segregate to some regions of the GBs along with the depletion of Fe, Co and Cr, while Cr is enriched in other regions of the GBs where Ni and Mn are depleted. The redistribution of these elements on the GBs follow a periodic characteristic, spinodal-like compositional modulation. The accumulation of elements at the GBs can create local compositions by shifting their state from a solid solution (like in the adjacent bulk region) into a spinodal regime to promote interfacial phase-like transitions as segregation proceeds. These results not only shed light on phase precursor states and the associated nucleation mechanism at GBs in alloy systems with multiple principal elements but also help to guide the microstructure design of advanced HEAs in which formation of embrittling phases at interfaces must be avoided. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	High entropy alloys Grain boundary segregation Compositional modulation Spinodal decomposition Atom-probe tomography
资助者	Deutsche Forschungsgemeinschaft ; Alexander von Humboldt Stiftung ; China Scholarship Council
DOI	10.1016/j.actamat.2019.07.052
收录类别	SCI
语种	英语
资助项目	Deutsche Forschungsgemeinschaft[SPP 2006] ; Alexander von Humboldt Stiftung ; China Scholarship Council
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000487169000001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：121[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/135467
专题	中国科学院金属研究所
通讯作者	Li, Linlin; Raabe, Dierk
作者单位	1.Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany 2.Chinese Acad Sci, Inst Met Res, Wenhua Rd 72, Shenyang 110016, Liaoning, Peoples R China 3.Imperial Coll London, Royal Sch Mine, Dept Mat, London SW7 2AZ, England
推荐引用方式 GB/T 7714	Li, Linlin,Li, Zhiming,da Silva, Alisson Kwiatkowski,et al. Segregation-driven grain boundary spinodal decomposition as a pathway for phase nucleation in a high-entropy alloy[J]. ACTA MATERIALIA,2019,178:1-9.
APA	Li, Linlin.,Li, Zhiming.,da Silva, Alisson Kwiatkowski.,Peng, Zirong.,Zhao, Huan.,...&Raabe, Dierk.(2019).Segregation-driven grain boundary spinodal decomposition as a pathway for phase nucleation in a high-entropy alloy.ACTA MATERIALIA,178,1-9.
MLA	Li, Linlin,et al."Segregation-driven grain boundary spinodal decomposition as a pathway for phase nucleation in a high-entropy alloy".ACTA MATERIALIA 178(2019):1-9.