Ti和Fe中间层对TA15/硬质合金复合板界面结构与剪切强度的影响  

Influence of Ti and Fe intermediate layer on interface structure and shear strength of TA15/cemented carbide composite plates

作　　者：李俊杰 何维均[1] 田宇禾 胥政 袁飞 蒋斌[1] LI Jun-jie;HE Wei-jun;TIAN Yu-he;XU Zheng;YUAN Fei;JIANG Bin(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《材料热处理学报》2024年第11期37-47,共11页Transactions of Materials and Heat Treatment

基　　金：国防科工局基础科研项目(JCKY2021110B050)。

摘　　要：钛合金和硬质合金在扩散复合过程中由于易产生脆硬化合物、热膨胀系数差异诱导高热应力等,导致界面结合性能较差。为了改善TA15/硬质合金复合材料界面结合性能,研究了中间层、复合温度以及硬质合金中Co含量对复合材料界面结构和剪切强度的影响。通过扫描电镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)等表征方法对复合材料界面附近的元素扩散、界面化合物的类型等进行分析。通过压缩剪切实验对TA15/硬质合金复合材料的界面剪切强度进行测试。结果表明:加入中间层材料(Ti、Fe)可以在一定程度上增加界面附近元素扩散,还能够通过自身的塑性变形来释放复合界面的热应力,从而提升界面的结合性能。复合温度会影响界面附近的元素扩散速率和复合界面的组织结构,从而影响复合材料界面结合性能。During the diffusion bonding,titanium alloys and cemented carbides are prone to producing brittle compounds and inducing high thermal stress due to differences in thermal expansion coefficients,resulting in poor interfacial bonding performance.In order to improve the interfacial bonding performance of TA15/cemented carbide composites,the effects of intermediate layer,diffusion bonding temperature,and Co content in cemented carbide on the interfacial structure and shear strength of the composites were studied.The diffusion of elements near the interface of the composites and the types of interface compounds were analyzed by means of scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and X-ray diffraction(XRD).The interfacial shear strength of the TA15/cemented carbide composites was measured by compression shear experiments.The results show that the addition of intermediate layer materials(such as Ti and Fe)can increase the diffusion of elements near the interface,and can also release the thermal stress of the composite interface through its own plastic deformation,thereby improving the bonding performance of the interface.The diffusion bonding temperature will affect the diffusion rate of elements near the interface and the microstructure of the bonding interface,thereby affecting the interfacial bonding performance of the composites.

关 键 词：TA15/硬质合金复合材料 中间层材料 界面结构 结合性能 

分 类 号：TB331[一般工业技术—材料科学与工程]