SPS原位制备(TiB+TiC)/Ti-6Al-4V复合材料的组织与性能

采用低能球磨和放电等离子烧结原位制备(TiB+TiC)/Ti-6Al-4V复合材料,研究了烧结温度和B4C添加量对复合材料组织性能的影响。结果表明,在1 000~1 150℃范围内,1 100℃烧结时增强相呈不连续网状,复合材料的屈服强度、抗压强度和工程应变均最好;基体合金组织为魏氏组织,复合材料基体为厚片状α相和片间β相组织,晶粒明显细化,显微硬度随增强相含量的增多而提高,而工程应变随之降低。强度在B4C含量为2%时达到最高,屈服强度和抗拉强度分别为1 410.55MPa和1 771.65MPa。

Microstructure and Properties of In-situ Synthesized(TiB+TiC)/Ti-6Al-4V Composites by SPS

(TiB+TiC)reinforced Ti-6Al-4V matrix composites were in-situ synthesized through low energy milling and spark plasma sintering.The effects of sintering temperature and B4C addition on the microstructure and properties of the composites were investigated.The results show that sintered at 1 000~1 150 ℃,the reinforcments are distributed at the boundary of the original particles at 1 100℃,which is discontinuous in form of a network,and the yield strength,compressive strength and engineering strain of the composites reach the maximum value.Microstructure of matrix alloy presents lamellar Wei’s structure,which is flakyαandβin composites,and the grains of composites are refined remarkably.As the increase of the reinforcements content,microhardness is increased,while the engineering strain is decreased.The strength of the composites reaches the highest at 2% B4C addition,where yield strength and tensile strength reach 1 410.55 MPa and 1 771.65 MPa,respectively.