热处理对Cu/Ti层状异质结构复合材料组织及力学性能的影响  

Effect of heat treatment on microstructure and mechanical properties of Cu/Ti laminated hetero-structure composites

作　　者：祁凯 张兵[1,2] 赵田丽 杨艳[3] 张志娟 王快社[1,2] 蔡军 QI Kai;ZHANG Bing;ZHAO Tian-li;YANG Yan;ZHANG Zhi-juan;WANG Kuai-she;CAI Jun(School of Metallurgical Engineering,Xi′an University of Architecture and Technology,Xi′an 710055,China;National&Local Engineering Researching Center for Functional Materials Processing,Xi′an 710055,China;State Key Laboratory of Nickel and Cobalt Resource Integrated Utilization,Jinchuan Group Co.,Ltd.,Jinchang 737100,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 [2]功能材料加工国家地方联合工程研究中心,陕西西安710055 [3]金川集团股份有限公司镍钴资源综合利用国家重点实验室,甘肃金昌737100

出　　处：《塑性工程学报》2023年第2期160-169,共10页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51874226);陕西省创新能力支撑计划科技创新团队项目(2022TD-30)。

摘　　要：利用金相显微镜、扫描电镜、电子背散射衍射和疲劳试验机研究了热处理对Cu/Ti层状异质结构复合材料微观组织及力学性能的影响。结果表明,在400℃×60 min热处理后,Cu/Ti界面处无扩散;在600℃×60 min热处理后生成2μm的扩散层,在800℃×60 min热处理后扩散层厚度增长至约12μm,分为Cu_(4)Ti、Cu_(4)Ti_(3)和CuTi_(3)共3层结构。400℃×60 min热处理后,复合材料因Ti层而存在异质结构,在拉伸变形过程中,异质变形诱导强化导致其拥有良好的综合力学性能,其抗拉强度和断后伸长率分别为361.7 MPa和36.7%。随着热处理温度的升高,Ti层异质结构逐渐消失,异质变形诱导强化减弱,同时Cu/Ti界面间生成金属间化合物层,从而导致复合材料塑性下降。The effects of heat treatment on the microstructure and mechanical properties of Cu/Ti laminated heterostructured composites were studied by optical microscopy(OM),scanning electron microscopy(SEM),electron backscattered diffraction(EBSD)and fatigue testing machine.The results show that after heat treatment at 400℃×60 min,there is no diffusion at the Cu/Ti interface.After 600℃×60 min of heat treatment,2μm diffusion layer is formed,and after heat treatment at 800℃×60 min,the thickness of diffusion layer increases to about 12μm,which is three-layer structure with Cu_(4)Ti,Cu_(4)Ti_(3)and CuTi_(3).After heat treatment at 400℃×60 min,the composite has hetero-structure due to different Ti layers,during tensile deformation,the hetero-deformation induced strengthening leads to good comprehensive mechanical properties,the tensile strength and elongation after fracture are 361.7 MPa and 36.7%,respectively.With the increase of heat treatment temperature,the hetero-structure of Ti layer gradually disappeares,and the hetero-deformation induced strengthening weakens.At the same time,inter-metallic compounds layer between Cu/Ti interfaces is formed,which leads to the decrease of plasticity of composites.

关 键 词：异质结构 Cu/Ti层状复合材料 热处理 微观组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]