Characterization of ripplocation mobility in graphite

被引:17
作者
Gruber, J. [1 ]
Barsoum, M. W. [2 ]
Tucker, G. J. [3 ]
机构
[1] Colorado Sch Mines, Mat Sci, Golden, CO 80401 USA
[2] Drexel Univ, Mat Engn, Philadelphia, PA 19104 USA
[3] Colorado Sch Mines, Mech Engn, Golden, CO 80401 USA
来源
MATERIALS RESEARCH LETTERS | 2020年 / 8卷 / 02期
基金
美国国家科学基金会;
关键词
Layered solids; deformation mechanisms; buckling; ripplocations; KINK BANDS;
D O I
10.1080/21663831.2019.1702115
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Recent work suggests that layered solids deform through buckling of basal planes. When isolated locally, as in graphite, these buckles, termed ripplocations, behave superficially similar to dislocations, but have no Burgers vectors. Through atomistic simulations, we demonstrate the easy transitions of ripplocations in graphite between many closely-spaced energy states, even at low temperatures. Between 60 and 350 K, their migration barrier is estimated at 32 meV, independent of segment length. Ripplocations spontaneously migrate towards vacancies and away from compressive stresses. These results shed more light on this new micromechanism and potentially explain experimental observations that evade sufficient description through dislocation-based models. [GRAPHICS] IMPACT STATEMENT These results shed more light on this new micromechanism and the high mobility and vacancy interactions of ripplocations potentially explain experimental observations that evade sufficient description through dislocation-based model.
引用
收藏
页码:82 / 87
页数:6
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