Exploration of the sliding behavior of a Σ11 grain boundary with precipitates in Ni-Al system using molecular dynamics

被引：7

作者：

Morrison, Rachel L. ^{[1
]}

Fensin, Saryu J. ^{[2
]}

Carter, Jennifer L. W. ^{[1
]}

机构：

[1] Case Western Reserve Univ, Mesoscale Sci Lab, Cleveland, OH 44106 USA

[2] Los Alamos Natl Lab, MST 8, Los Alamos, NM USA

来源：

MATERIALIA | 2019年 / 7卷

基金：

美国国家科学基金会;

关键词：

Grain boundary sliding; Molecular dynamics (MD); Precipitation; Nickel alloys; Coincidence lattice; MOTION; CREEP;

D O I：

10.1016/j.mtla.2019.100383

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Molecular dynamics (MD) was used to gain insights into grain boundary (GB) shear mechanisms in alloys that require GB mobility in a field of coherent precipitates. The area fraction of the Sigma 11 affected by the gamma' was systematically varied to explore how GB shear mechanisms change with increased number of precipitates. Without precipitates, local atomic shuffling accommodates the Sigma 11 GB shear; above an area-fraction threshold, GB shear required dislocation emission. In addition to precipitate area fraction, the transition in GB shear mechanisms may also depend on precipitate shape/size, temperature, and GB misorientation. These factors will be investigated in future work. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. This is an open access article under the CC BY license. (http://creativecommons.org/licenses/by/4.0/)

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页数：5

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