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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
发表期刊SCIENCE
ISSN0036-8075
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
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.
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