Enhanced Hall-Petch strengthening in graphene/Cu nanocomposites  

作　　者：Shuang Zhang Fei Wang Ping Huang 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an,710049,China [2]State Key Laboratory for Strength and Vibration of Mechanical Structures,School of Aerospace,Xi’an Jiaotong University,Xi’an,710049,China

出　　处：《Journal of Materials Science & Technology》2021年第28期176-183,共8页材料科学技术（英文版）

基　　金：financially supported by the Natural Science Foundation of Shaanxi Province(No.2019TD-020);the Natural Science Basic Research Plan in Shaanxi Province of China(Nos.2020JM-41 and 2020JM-33);the National Natural Science Foundation of China(No.51471131);the Fundamental Research Funds for the Central Universities。

摘　　要：Grain size dependent strength,known as Hall-Petch relation,has been approved to be valid in crystalline metals and alloys.However,softening would eventually occur as grain size reduced into nanoscale that below a critical value.Hence,it is essential to find a way to break the strength limitation by avoiding the deformation mechanism transition from dislocation-mediated to grain-boundary-mediated processes.By replacing grain boundary(GB)of nanocrystalline Cu with graphene,in the present study,molecular dynamics simulations show that graphene-boundary(GrB)embedded GrB/Cu nanocomposites exhibit enhanced enlarged Hall-Petch slope with decreasing grain size.The absence of inverse-Hall-Petch relation and the extremely high strength derived at the GrB/Cu nanocomposites were interpreted by the high back stress and abundant dislocation activity that attributed from the high-degree of heterogeneous structure of the nanocomposites.

关 键 词：Hall-Petch relation Graphene composite Strengthening Molecular dynamics simulation Dislocations 

分 类 号：TB333[一般工业技术—材料科学与工程]