A classical equation that accounts for observations of non-Arrhenius and cryogenic grain boundary migration
作者机构：Department of Mechanical EngineeringBrigham Young UniversityProvoUT84602USA Department of Chemistry and BiochemistryBrigham Young UniversityProvoUT84602USA Department of Metallurgical and Materials EngineeringUniversity of AlabamaTuscaloosaAL35401USA
出 版 物：《npj Computational Materials》 (计算材料学（英文）)
年 卷 期：2022年第8卷第1期
页 面：1492-1500页
核心收录：
学科分类：07[理学] 070104[理学-应用数学] 0701[理学-数学]
基 金：This work was supported by the U.S.Department of Energy (DOE) Office of Science Basic Energy Sciences (BES) under Award #DE-SC0016441
摘 要：Observations of microstructural coarsening at cryogenic temperatures,as well as numerous simulations of grain boundary motion that show faster migration at low temperature than at high temperature,have been troubling because they do not follow the expected Arrhenius *** work demonstrates that classical equations,that are not simplified,account for all these oddities and demonstrate that non-Arrhenius behavior can emerge from thermally activated *** to this classical model,this occurs when the intrinsic barrier energies of the processes become small,allowing activation at cryogenic *** thermal energy then allows the low energy process to proceed in reverse,so increasing temperature only serves to frustrate the forward *** classical form is shown to reconcile and describe a variety of diverse grain boundary migration observations.
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