晶界
材料科学
晶粒生长
微晶
溶剂拖动
粒度
阻力
晶界扩散系数
退火(玻璃)
中尺度气象学
化学物理
热力学
冶金
化学
微观结构
地质学
物理
气候学
作者
Elizabeth A. Holm,Stephen M. Foiles
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2010-05-28
卷期号:328 (5982): 1138-1141
被引量:213
标识
DOI:10.1126/science.1187833
摘要
The thermodynamic equilibrium state of crystalline materials is a single crystal; however, polycrystalline grain growth almost always stops before this state is reached. Although typically attributed to solute drag, grain-growth stagnation occurs, even in high-purity materials. Recent studies indicate that grain boundaries undergo thermal roughening associated with an abrupt mobility change, so that at typical annealing temperatures, polycrystals will contain both smooth (slow) and rough (fast) boundaries. Mesoscale grain-growth models, validated by large-scale polycrystalline molecular dynamics simulations, show that even small fractions of smooth, slow boundaries can stop grain growth. We conclude that grain-boundary roughening provides an alternate stagnation mechanism that applies even to high-purity materials.
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