增强相含量对原位(TiB+TiC)增强钛基复合材料组织与性能的影响

Effect of reinforcement phase content on the microstructure and properties of in-situ(TiB+TiC)reinforced titanium matrix composites

采用放电等离子烧结法制备了(TiC+TiB)/TC4复合材料,并研究了TiC和TiB增强相含量对钛基复合材料物相组成、微观结构和力学性能的影响。采用SPS温度为1100℃原位合成制备出(TiC+TiB)/TC4复合材料,TiCp和TiBw呈准连续的网状结构分布在晶界处。样品按照TiC∶TiB为1∶1的比例来制备出增强相体积分数为x%(x=0、1、2.5、5、7.5)增强钛基复合材料。在增强相的体积分数为2.5%时复合材料的屈服强度、抗压强度最高,分别为1264和1803 MPa,工程应变由基体合金的30%增加至39.4%。

Discharge plasma sintering method was used to prepare(TiC+TiB)/TC4 composite materials,and studies the influence of TiC and TiB reinforcement phase content on the phase composition,microstructure,and mechanical properties of titanium based composite materials.(TiC+TiB)/TC4 composite material was synthesized in situ using SPS at a temperature of 1100℃,with TiCp and TiBw distributed in a quasi continuous network structure at grain boundaries.The sample was prepared in a 1:1 ratio of TiC:TiB to prepare a reinforced titanium matrix composite with a volume fraction of x%(x=0,1,2.5,5,7.5).And when the volume fraction of the reinforcing phase is 2.5%,the yield strength and compressive strength of the composite material are the highest,with 1264 MPa and 1803 MPa,respectively.Engineering strain increases from 30% of the matrix alloy to 39.4%.