【摘要】 采用机械合金化和放电等离子烧结(SPS)技术制备了纳米TiC颗粒弥散增强超细晶W-TiC复合材料,对超细晶W-TiC复合材料的显微组织和室温力学性能进行了研究。研究表明,采用SPS工艺于1700℃下烧结1min可获得烧结颗粒结合良好,致密度高达约98.6%的超细晶W-TiC复合材料。通过添加纳米TiC,不仅能抑制W晶粒的长大,还能促进W的致密化。当TiC的加入量为0.7%时(质量分数,下同)可获得晶粒尺寸为0.5μm,抗弯强度和维氏硬度分别为1262MPa,6.45GPa的超细晶W-TiC复合材料。更多还原

【Abstract】 Nano TiC particles dispersion strengthened ultra fine grained(UFG) W-TiC composites were fabricated by mechanical alloying(MA) and spark plasma sintering(SPS).The microstructure and the room temperature mechanical properties of the W-TiC composites were studied.The results show that the well-combined and highly-densified(nearly 98.6%) UFG W-TiC composites can be obtained by SPS at 1700 oC for 1 min.The addition of the nano TiC can refine the grains of W,and accelerate its densification.The grain size,relative density,bending strength and the Vicker hardness HV0.2 of the UFG W-TiC composites are 0.5 μm,98.6%,1262 MPa and 6.45 GPa,respectively when the content of TiC is 0.7wt%.更多还原