Unconventional non-uniform local lattice distortion in dilute Ti-Mo solid solution

doi:10.1016/j.actamat.2020.07.033

IMR OpenIR

	Unconventional non-uniform local lattice distortion in dilute Ti-Mo solid solution
	Hu, Qing-Miao; Yang, Rui
通讯作者	Hu, Qing-Miao(qmhu@imr.ac.cn)
	2020-09-15
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	197 页码:91-96
摘要	The substitutional solute atom induced local lattice distortion (LLD) in dilute metal solid solution was believed to be uniform because the solute atom was supposed to occupy the high symmetry lattice site without breaking the point group symmetry of the crystal lattice. Contrary to this conventional picture, we report in this paper that substitutional Mo atom in Ti-Mo solid solution occupies an off-center position instead of the high symmetry lattice site and leads to highly non-uniform LLD, as evidenced by our first principles calculations. The physics underlying the off-center occupation and non-uniform LLD are shown to be the Jahn-Teller splitting of the degenerated d states of Mo atom. With which, the solid-solutions suffering from non-uniform LLD are predicted. The non-uniform LLD challenges the application of classical solid solution hardening model based on uniform LLD and spherical stress tensor assumption to this kind of solid solutions. This work also questions the traditional view that elementary substitutional solute atoms in metal solid solutions should not induce anelastic relaxation and internal friction. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词	Local lattice distortion Lattice dynamics Solid solution hardening Internal friction First principles calculations
资助者	Natural Science Foundation of China ; National Key Research and Development Program of China
DOI	10.1016/j.actamat.2020.07.033
收录类别	SCI
语种	英语
资助项目	Natural Science Foundation of China[91860107] ; National Key Research and Development Program of China[2016YFB0701301]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000564768300009
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：17[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/321006/140428
专题	中国科学院金属研究所
通讯作者	Hu, Qing-Miao
作者单位	Chinese Acad Sci, Inst Met Res, Wenhua Rd 72, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Hu, Qing-Miao,Yang, Rui. Unconventional non-uniform local lattice distortion in dilute Ti-Mo solid solution[J]. ACTA MATERIALIA,2020,197:91-96.
APA	Hu, Qing-Miao,&Yang, Rui.(2020).Unconventional non-uniform local lattice distortion in dilute Ti-Mo solid solution.ACTA MATERIALIA,197,91-96.
MLA	Hu, Qing-Miao,et al."Unconventional non-uniform local lattice distortion in dilute Ti-Mo solid solution".ACTA MATERIALIA 197(2020):91-96.