A Novel Metastable Structure in Polycrystalline Metals With Extremely Fine Grains: Schwarz Crystal

doi:10.1007/s11661-023-07232-4

IMR OpenIR

	A Novel Metastable Structure in Polycrystalline Metals With Extremely Fine Grains: Schwarz Crystal
	Lu, K.1,2
通讯作者	Lu, K.(lu@imr.ac.cn)
	2023-10-26
发表期刊	METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
ISSN	1073-5623
页码	19
摘要	Most metals exist in form of polycrystalline states consisting of crystalline grains and grain boundaries. These structurally defective boundaries make the materials thermodynamically unstable. Upon heating or straining, polycrystalline metals tend to be stabilized by eliminating grain boundaries through grain coarsening or transforming into metastable glassy phases when the grains are very small. Recently, we found a different metastable structure in polycrystalline face-centered-cubic pure metals and alloys as their grains are refined to a few nanometers with cryogenic high-pressure torsion. In this structure, named as "Schwarz crystal", the grain boundary networks evolved into the 3D periodical minimal surface structures constrained with high density twin-boundaries. It is thermally so stable that grain coarsening is inhibited at temperatures around the melting point, and exhibits a strength close to the theoretical value. Diffusional processes in alloys like precipitation of intermetallic phase, spinodal decomposition, as well as melting are inhibited with the Schwarz crystal structure. This paper briefly reviews the discovery of this novel metastable structure. The precursory process (grain boundary relaxation) in nanograined metals, formation and structure characteristics of the Schwarz crystals, as well as their thermal stability and strength in different metals and alloys will be introduced with experimental and molecular dynamic simulations. Perspectives and future studies on the structure will be discussed.
资助者	I sincerely thank Prof. X.Y. Li, Prof. Z.H. Jin, Dr. X. Zhou, Dr. W. Xu, and Prof. B. Zhang for their contributions to this study. Stimulating discussions and assistance from my colleagues and students are very much appreciated. This work was supported by ; Ministry of Science and Technology of China ; Chinese Academy of Sciences
DOI	10.1007/s11661-023-07232-4
收录类别	SCI
语种	英语
资助项目	I sincerely thank Prof. X.Y. Li, Prof. Z.H. Jin, Dr. X. Zhou, Dr. W. Xu, and Prof. B. Zhang for their contributions to this study. Stimulating discussions and assistance from my colleagues and students are very much appreciated. This work was supported by[2017YFA0700700] ; I sincerely thank Prof. X.Y. Li, Prof. Z.H. Jin, Dr. X. Zhou, Dr. W. Xu, and Prof. B. Zhang for their contributions to this study. Stimulating discussions and assistance from my colleagues and students are very much appreciated. This work was supported by[2017YFA0204401] ; Ministry of Science and Technology of China[zdyz201701] ; Chinese Academy of Sciences
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001090326500001
出版者	SPRINGER
引用统计	被引频次：2[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/321006/177968
专题	中国科学院金属研究所
通讯作者	Lu, K.
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Liaoning Acad Mat, Shenyang 110167, Peoples R China
推荐引用方式 GB/T 7714	Lu, K.. A Novel Metastable Structure in Polycrystalline Metals With Extremely Fine Grains: Schwarz Crystal[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2023:19.
APA	Lu, K..(2023).A Novel Metastable Structure in Polycrystalline Metals With Extremely Fine Grains: Schwarz Crystal.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,19.
MLA	Lu, K.."A Novel Metastable Structure in Polycrystalline Metals With Extremely Fine Grains: Schwarz Crystal".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE (2023):19.