Collaborative enhancement of thermal diffusivities and mechanical properties of C_(sf)-Cu/Mg composites via introducing Cu coating with different thicknesses  

作　　者：Yuan Ma Lingjun Guo Jiancheng Wang Baolin Chen Lehua Qi Hejun Li 

机构地区：[1]State Key Laboratory of Solidification Processing,Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials,Northwestern Polytechnical University,Xi’an,Shaanxi 710072,PR China [2]School of Mechanical Engineering,Northwestern Polytechnical University,Xi’an,Shaanxi 710072,PR China

出　　处：《Journal of Magnesium and Alloys》2025年第1期229-242,共14页镁合金学报(英文)

基　　金：supported by the National Natural Science Foundation of China(grant no.52231004 and 52072305).

摘　　要：Mg alloy matrix composites reinforced with short carbon fibers(C_(sf)/Mg)are considered as potential candidates for integrated structural-functional electronic parts that satisfy the requirements of lightweight,excellent mechanical properties,and heat dissipation.However,the different characteristics of C_(sf)and Mg alloy make the interface a critical issue affecting the synergistic improvement of thermal and mechanical properties of the composites.Here,Cu coating with different thicknesses is introduced to modify the C_(sf)/Mg interface,so as to simultaneously enhance the thermal and mechanical performances,which can combine the advantages of coating modification and matrix alloying.Results reveal that thermal diffusivity(TD)of 3-C_(sf)-Cu/Mg composites is as high as 22.12 mm^(2)/s and an enhancement of 52.97%is achieved compared with C_(sf)/Mg composites,as well as 16.3%enhancement of ultimate compressive strength(UCS)in the longitudinal direction,8.84%improvement of UCS in the transverse direction,and 53.08%increasement of ultimate tensile strength(UTS).Such improvement can be ascribed to the formation of intermetallic compounds.The formation of intermetallic compounds can not only effectively alleviate the lattice distortion of the matrix and decrease interfacial thermal resistance,but also bear the loads.Our work is of great significance for designing C_(sf)/Mg composites with integrated structure and function.

关 键 词：Magnesium matrix composites Cu coating thickness Intermetallic compounds Thermal performances Mechanical properties 

分 类 号：TB333[一般工业技术—材料科学与工程]