Enhanced thermal stability of nanograined metals below a critical grain size

IMR OpenIR

	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.
	2018-05-04
发表期刊	SCIENCE
ISSN	0036-8075
卷号	360 期号:6388 页码:526-529
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.
部门归属	[zhou, x. ; li, x. y. ; lu, k.] chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, liaoning, peoples r china ; [zhou, x.] univ sci & technol china, sch mat sci & engn, hefei 230026, anhui, peoples r china
关键词	High-pressure Torsion High-purity Copper Pure Copper Nanocrystalline Materials Boundary Dissociation Solute Segregation Temperature Emission Deformation Extrusion
学科领域	Multidisciplinary Sciences
资助者	Ministry of Science and Technology of China [2012CB932201, 2017YFA0204401]; National Science Foundation of China [51231006]; Chinese Academy of Sciences [zdyz201701]
收录类别	SCI
语种	英语
WOS记录号	WOS:000431351500044
引用统计	被引频次：308[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/321006/79314
专题	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.