原位自生非连续颗粒增强钛基复合材料的组织和力学性能  

Microstructure and Mechanical Properties of In-situ Synthesized Discontinuous Particles Reinforced Titanium Matrix Composite

作　　者：罗贤晖 刘品旺 宋静雯 黄光法[1] LUO Xianhui;LIU Pinwang;SONG Jingwen;HUANG Guangfa(State Key Laboratory of Metal Matrix Composites , School of Materials Science and Engineering ,Shanghai Jiaotong University , Shanghai 200240, China)

机构地区：[1]上海交通大学材料科学与工程学院,金属基复合材料国家重点实验室,上海200240

出　　处：《机械工程材料》2018年第12期31-35,41,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51371114).

摘　　要：以海绵钛、镧粉、TiB2粉和石墨粉为原料,通过原位反应分别制备得到1%(体积分数,下同)La2O3、5%TiB+1%La2O3、5%TiC+1%La2O3等3种增强体增强钛基复合材料,研究了复合材料的显微组织和力学性能,并与相同工艺所得纯钛的进行了对比。结果表明:复合材料的基体组织为α-Ti,原位生成的La2O3呈颗粒状或短棒状,TiB呈短纤维状,并沿锻造方向排列,TiC呈等轴状和不规则形状;所得钛基复合材料的硬度、抗拉强度和屈服强度均显著高于纯钛的,断后伸长率低于纯钛的。Titanium matrix composites reinforced with three reinforcements of 1vol%La 2 O 3 , 5vol%TiB+1vol%La 2 O 3 and 5vol%TiC+1vol%La 2 O 3 , respectively , were prepared by in - situ reactions with sponge titanium ,lanthanum powder , titanium diboride powder and graphite powder as raw materials.The microstructure andmechanical properties of the composites were studied and compared with those of pure titanium prepared by thesame process.The results show that the matrix microstructure of the composites consisted ofα - Ti.The in - situsynthesized La 2 O 3 was granular or short - rob like , the TiB was short - fiber like and distributed along the forgingdirection , and the TiC was equiaxed or irregular shape.The hardness , tensile strength and yield strength of theobtained titanium matrix composites were higher than those of the pure titanium , while the elongation was lowerthan that of the pure titanium.

关 键 词：钛基复合材料 TIB LA2O3 TIC 显微组织 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]