热轧石墨烯增强铜铬锆复合材料微观组织与性能  

Microstructure and Properties of Hot-Rolled Graphene Reinforced Copper-Chromium-Zirconium Composites

作　　者：王庆娟[1] 张玉峰 王伟[1] 刘丹 刘世锋[1] Wang Qingjuan;Zhang Yufeng;Wang Wei;Liu Dan;Liu Shifeng(College of Metallurgy Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《稀有金属》2022年第5期589-596,共8页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(52174371);陕西省教育厅2019年度服务地方科学研究计划项目(19JC025)资助。

摘　　要：石墨烯/铜铬锆基复合材料具有优良的性能,石墨烯在基体中的分布情况直接影响复合材料的物理性能和力学性能。采用放电等离子烧结(SPS)法和轧制工艺制备了不同石墨烯含量的石墨烯/铜铬锆基复合材料(GNP/CuCrZr基复合材料),研究了复合材料的显微组织形貌,并对复合材料的致密度、硬度、导电率进行了分析。根据复合材料的力学性能和拉伸断口形貌,分析了复合材料热轧前后的断裂机制。结果表明:SPS后,GNP随机分布在CuCrZr基体中,此时复合材料晶粒较粗大;热轧后复合材料发生再结晶现象,晶粒尺寸减小,GNP沿着轧制方向定向排列并均匀的分布在晶界处。热轧有效改善了GNP/CuCrZr基复合材料的致密度,且随着石墨烯含量的增加,改善效果越明显。轧制态0.25%GNP/CuCrZr基复合材料致密度达到了99.8%。轧制后复合材料的强度和塑性大幅度增加,轧制态0.25%GNP/CuCrZr基复合材料的抗拉强度为272 MPa,延伸率为34%,与烧结态的复合材料相比分别提高了3.0%和143%。烧结后复合材料断裂机制为脆性断裂,而轧制后变为韧性断裂。Graphene/Cu-Cr-Zr matrix composites have excellent properties,and the distribution of graphene in the matrix directly affects the physical and mechanical properties of the composites.Graphene/CuCrZr matrix composites(GNP/CuCrZr matrix composites)with different graphene contents were prepared by spark plasma sintering(SPS)method and rolling process.The microstructure and morphology of the composites were studied by scanning electron microscope and metallographic microscope,and the density,hardness,electrical conductivity and mechanical properties of the composites were analyzed.According to the mechanical properties of the composites and the tensile fracture morphology at room temperature,the fracture mechanism of the composites before and after hot rolling was analyzed.The results showed that after the spark plasma sintering process,unmelted Cr particles could be seen on the surface of the sample.The distribution of Cr particles had no relationship with the content of graphene.The graphene was randomly distributed in the CuCrZr matrix,and the distribution was not uniform.The grain size of the composite material was relatively coarse,and the grain size was 10~30µm.With the increase of graphene content,the morphology of graphene gradually changed from flake to block;the copper matrix recrystallized,resulting in recrystallized grains after hot rolling,with the increase of graphene content,the grain size decreased,almost equiaxed;the undissolved Cr particles were flattened and the size was slightly reduced,and the graphene was elongated along the rolling direction and closely arranged and evenly distributed.Hot rolling could effectively improve the density of GNP/CuCrZr matrix composites,and with the increase of graphene content,the improvement effect was more obvious.Rolling made the grains of the composite material broken and refined under high pressure,filled in the holes and cracks in the material,reduced the pore size and porosity,increased the contact area between grains,and reduced the defects of the copper m

关 键 词：石墨烯 铜铬锆合金 热轧 放电等离子烧结(SPS) 力学性能 复合材料 

分 类 号：TK91[动力工程及工程热物理]