Enhanced thermal stability of nanograined metals below a critical grain size

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	Enhanced thermal stability of nanograined metals below a critical grain size
	Zhou, X; Li, XY; Lu, K; Lu, K (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
刊名	SCIENCE
	2018-05-04
卷号	360 期号:6388 页码:526-529
关键词	High-pressure Torsion High-purity Copper Pure Copper Nanocrystalline Materials Boundary Dissociation Solute Segregation Temperature Emission Deformation Extrusion
ISSN号	0036-8075
英文摘要	The limitation of nanograined materials is their strong tendency to coarsen at elevated temperatures. As grain size decreases into the nanoscale, grain coarsening occurs at much lower temperatures, as low as ambient temperatures for some metals. We discovered that nanometer-sized grains in pure copper and nickel produced from plastic deformation at low temperatures exhibit notable thermal stability below a critical grain size. The instability temperature rises substantially at smaller grain sizes, and the nanograins remain stable even above the recrystallization temperatures of coarse grains. The inherent thermal stability of nanograins originates from an autonomous grain boundary evolution to low-energy states due to activation of partial dislocations in plastic deformation.; The limitation of nanograined materials is their strong tendency to coarsen at elevated temperatures. As grain size decreases into the nanoscale, grain coarsening occurs at much lower temperatures, as low as ambient temperatures for some metals. We discovered that nanometer-sized grains in pure copper and nickel produced from plastic deformation at low temperatures exhibit notable thermal stability below a critical grain size. The instability temperature rises substantially at smaller grain sizes, and the nanograins remain stable even above the recrystallization temperatures of coarse grains. The inherent thermal stability of nanograins originates from an autonomous grain boundary evolution to low-energy states due to activation of partial dislocations in plastic deformation.
学科主题	Multidisciplinary Sciences
语种	英语
资助机构	Ministry of Science and Technology of China [2012CB932201, 2017YFA0204401]; National Science Foundation of China [51231006]; Chinese Academy of Sciences [zdyz201701]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79314]
专题	金属研究所_中国科学院金属研究所
通讯作者	Li, XY; Lu, K (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Zhou, X,Li, XY,Lu, K,et al. Enhanced thermal stability of nanograined metals below a critical grain size[J]. SCIENCE,2018,360(6388):526-529.
APA	Zhou, X,Li, XY,Lu, K,&Lu, K .(2018).Enhanced thermal stability of nanograined metals below a critical grain size.SCIENCE,360(6388),526-529.
MLA	Zhou, X,et al."Enhanced thermal stability of nanograined metals below a critical grain size".SCIENCE 360.6388(2018):526-529.