Grain boundary migration and Zener pinning in a nanocrystalline Cu-Ag alloy

Li，Runjie1; Zhou，Jian1; Li，Yi1; Liu，Yihan1; Zhao，Bingbing2,3; Ren，Fuzeng4

2020-09-01

10.1088/1361-651X/aba737

MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING   影响因子和分区

0965-0393

1361-651X

Grain boundary (GB) migration and Zener pinning, i.e. retardment of migrating GBs by second-phase particles, in a nanocrystalline Cu-Ag alloy have been investigated via molecular dynamics simulation. Among 86 GBs of different rotation axes and misorientation angles, about half of the GBs either did not move for an obvious distance within limited simulation time or underwent unsteady migration, and the other GBs exhibited steady migration. For the motionless and unsteady-migration GBs, boundary faceting was frequently observed. In particular, as found in experiments, all low angle GBs and several high angle GBs became faceted. For the steady-migration GBs, rotation-axis and misorientation dependences of GB energy, GB mobility and particle pinning effects have been systematically revealed. It is found that both the energy and mobility of low angle GBs were generally lower than those of high angle GBs, GBs of distinct rotation axes differed in mobility by as large as three orders of magnitude, and the maximum pinning force always agreed well with the theoretical prediction proposed by Ashby et al [1]. Moreover, pinning efficiency obtained via comparisons between boundary migration with and without the pinning indicates that the efficiency is not related to the GB mobility or the maximum pinning force and a nanosized second phase particle seems to have a limited effect on retarding GB motion in very fine nanograins.

faceting grain boundary mobility molecular dynamics nanocrystalline alloys precipitates Zener pinning

SCI ; EI

英语

其他

20204109309562

Grain boundaries ; Binary alloys ; Copper alloys ; Nanocrystalline alloys ; Rotation ; Silver alloys ; Nanocrystals

Copper Alloys:544.2 ; Precious Metals:547.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Mechanics:931.1 ; Crystalline Solids:933.1

MATERIALS SCIENCE

2-s2.0-85091964518

Scopus

1.Shagang School of Iron and Steel,Soochow University,Suzhou,8 Ji Xue Road,215137,China
2.School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,800 Dong Chuan Road,200240,China
3.Materials Genome Initiative Center,Shanghai Jiao Tong University,Shanghai,800 Dong Chuan Road,200240,China
4.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen, Guangdong,518055,China

Li，Runjie,Zhou，Jian,Li，Yi,et al. Grain boundary migration and Zener pinning in a nanocrystalline Cu-Ag alloy[J]. MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING,2020,28(6).

Li，Runjie,Zhou，Jian,Li，Yi,Liu，Yihan,Zhao，Bingbing,&Ren，Fuzeng.(2020).Grain boundary migration and Zener pinning in a nanocrystalline Cu-Ag alloy.MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING,28(6).

Li，Runjie,et al."Grain boundary migration and Zener pinning in a nanocrystalline Cu-Ag alloy".MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING 28.6(2020).