摘要
Ti-6Al-4V/TiN composites were successfully consolidated by spark plasma sintering(SPS).TiN addition to Ti-6Al-4V was varied from1%to5%(volume fraction).The effect of TiN addition on the densification,microstructure,microhardness and wear behaviour of Ti-6Al-4V was studied.Experimental results showed reduction in sintered density of the compacts from99%to97%with increase in TiN content.However,an increase in microhardness value was recorded from HV0.1389to HV0.1488.X-ray diffraction(XRD)analysis showed that the intensity of diffraction peaks of TiN phase in the composites increased also with formation of small amount of secondary Ti2N phase.SEM analysis of SPS sintered nanocomposites possessed a refinement ofα/βphase microstructure in Ti-6Al-4V with the presence of uniformly dispersed TiN particles.The worn surface of the composite showed improved abrasive wear resistance with non-continuous grooves as compared to the sintered Ti-6Al-4V without TiN addition.
采用放电等离子烧结(SPS)成功制备Ti-6Al-4V/TiN复合材料。加入Ti-6Al-4V中的TiN含量变化范围为1%~5%(体积分数)。研究添加TiN对Ti-6Al-4V材料致密度、显微组织、硬度和磨损行为的影响。实验结果表明,随着TiN含量的增加,材料的烧结密度从99%降低至97%;而显微硬度值却从HV_(0.1) 389增加至HV_(0.1) 488。X射线衍射(XRD)分析表明,伴随着少量二次Ti_2N相的形成,复合材料中TiN相的衍射峰强度增加。SEM分析表明,SPS烧结Ti-6Al-4V纳米复合材料具有细化的α/β相组织及均匀分散的TiN颗粒。与无添加烧结Ti-6Al-4V相比,Ti-6Al-4V/TiN复合材料的磨损表面呈现非连续的凹槽,抗磨粒磨损性能得到提高。
