Abstract—Theoretical models are proposed that describe the initial stage of plastic deformation in metal–graphene composites with a homogeneous ultrafine-grained metal matrix, as well as with a bimodal grain size distribution. The models take into account both dislocation mechanisms of plasticity and the processes of structural transformations of grain boundaries associated with grain-boundary sliding. As a result of the calculations, the dependences of the yield strength on the grain size of the matrix and the volume fraction of graphene were obtained. Models allow one to find the optimal graphene content to achieve maximum material strength.

中文翻译：

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具有均质和双峰晶粒结构的金属-石墨烯复合材料的屈服强度

摘要—提出了描述具有均质超细晶粒金属基体以及双峰粒度分布的金属-石墨烯复合材料塑性变形初始阶段的理论模型。该模型考虑了塑性的位错机制和与晶界滑动相关的晶界的结构转变过程。作为计算的结果，获得了屈服强度对基体晶粒尺寸和石墨烯的体积分数的依赖性。通过模型可以找到最佳的石墨烯含量，以实现最大的材料强度。