中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Enhanced thermal stability of nanograined metals below a critical grain size

文献类型:期刊论文

作者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
出版日期2018-05-04
卷号360期号:6388页码:526-529
ISSN号0036-8075
关键词High-pressure Torsion High-purity Copper Pure Copper Nanocrystalline Materials Boundary Dissociation Solute Segregation Temperature Emission Deformation Extrusion
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
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.

入库方式: OAI收割

来源:金属研究所

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