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首页> 外文期刊>Materials Science Research International >Cooperative dislocation generation at finite temperatures in loaded solids -- transition from brittle to ductile regime
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Cooperative dislocation generation at finite temperatures in loaded solids -- transition from brittle to ductile regime

机译：在有限温度下在负载固体中产生合作位错-从脆性转变为韧性状态

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摘要

This paper describes a theoretical model and a Monte Carlo simulation of cooporative dislocation generation in loaded crystals at finite temperatures. The theoretical work, employing a mean-field approach, is presented for the three-dimensional case when dislocation loops are formed. It describes how extensive plasticity can be initiated in dislocation-free crystals above a critical temperature due to 'homogeneous' cooperative nucleation and expansion of many dislocation loops. The Monte Carlo simulation is carried out to demonstrate the feasibility of the theoretical model. It is performed for a two dimensional case when dislocation dipoles are formed on an underlying lattice under applied loads. The application of this model to the brittle-to-ductile transition and the yielding of whiskers is discussed.
机译：本文描述了在有限温度下负载晶体中产生色合作用位错的理论模型和蒙特卡洛模拟。当位错环形成时，针对三维情况，提出了采用均值场方法的理论工作。它描述了由于“均匀”的协作成核和许多位错环的扩展，临界温度以上的无位错晶体如何能够引发广泛的塑性。进行了蒙特卡洛模拟以证明该理论模型的可行性。当在施加载荷的情况下在下面的晶格上形成位错偶极子时，对于二维情况执行此操作。讨论了该模型在脆性-韧性转变和晶须屈服中的应用。

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