作　　者： ; ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《粉末冶金材料科学与工程》 2013年第5期680-686,共7页

摘　　要： 在Ti粉中同时加入Mo2C、VC、NbC、WC粉末,通过多组元合金化与原位合成TiC颗粒,来制备TiC颗粒增强钛基复合材料TiC/Ti-Mo-V-Nb-W,通过X射线衍射和扫描电镜分析该复合材料的相成分和显微组织,测试其室温力学性能,并分析其断裂机理。结果表明:Ti与Mo2C等反应原位生成的TiC颗粒,呈等轴状或近等轴状;TiC颗粒总体分布均匀,但局部有团聚现象;Mo、V、Nb、W等固溶在Ti基体中,基体为近β-Ti合金;TiC/Ti-Mo-V-Nb-W复合材料在室温下具有较好的塑性,抗拉强度和伸长率分别为1 023.6 MPa和17.4%,断裂失效主要由TiC颗粒断裂和基体断裂引起。 TiC/Ti-Mo-V-Nb-W composite was prepared through the multi-component in-situ synthesis reaction using Ti, Mo2C, VC, NbC and WC mixed powders as raw materials. The phase composition of the prepared composite were identified by X-ray diffraction （XRD）, and the microstructures as well as the fracture surface and mechanism were examined by scanning electron microscopy （SEM）. Beside, the tensile properties were tested at room temperature. The results show that the reactions between Ti and Mo2C, VC, NbC, WC result in the formation of equiaxial or similar equiaxial shape TiC particles and nearβ-Ti alloy. The TiC particles distribute uniformly but agglomerate locally in the matrix alloy as a whole. Mo, V, Nb, W dissolve in Ti matrix, and the matrix is similar as near β-Ti alloy. The TiC/Ti-Mo-V-Nb-W composite has better plasticity property with tensile strength of 1 023.6 MPa and elongation of 17.4%at room temperature. The rupture of TiC particles and matrix are the main cause for the fracture of composites.

关 键 词： 钛基复合材料 粉末冶金 显微组织 力学性能 断裂机理

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]