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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.
2018-05-04
Source PublicationSCIENCE
ISSN0036-8075
Volume360Issue:6388Pages:526-529
AbstractThe 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.
description.department[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
KeywordHigh-pressure Torsion High-purity Copper Pure Copper Nanocrystalline Materials Boundary Dissociation Solute Segregation Temperature Emission Deformation Extrusion
Subject AreaMultidisciplinary Sciences
Funding OrganizationMinistry of Science and Technology of China [2012CB932201, 2017YFA0204401]; National Science Foundation of China [51231006]; Chinese Academy of Sciences [zdyz201701]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79314
Collection中国科学院金属研究所
Corresponding AuthorLi, 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.
Recommended Citation
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.
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