摘要
采用液相烧结法(LPS)制备了TiC／Ti复合材料,借助X射线衍射(XRD)分析了复合材料的相构成。对TiC／Ti复合材料进行了高温压缩和高温挤压实验,利用扫描电镜(SEM)和光学显微镜(OM)分析了复合材料高温变形前后的微观组织。实验结果表明：基体Ti与烧结助剂中的Cu发生反应生成玻璃相TiCu2。在高温塑性变形过程中,由于液相TiCu_2的存在,使复合材料表现出良好的高温塑性变形能力,压缩率达到72．9％,挤压比为16：1；复合材料高温塑性变形后,材料中的孔洞明显减少,致密度得到提高,组织成分保持稳定：处于液相状态的TiCu2高温挤压后,细化成尺寸为1μm-2μm的小颗粒,均匀分布于基体Ti颗粒的周围。
TiC/Ti composite were fabricated by liquid phase sintering （LPS） method. The phase composition of the composites was investigated by means of XRD. The composite prepared by LPS were compressed and extruded at high temperature, respectively. The microstructure of the composite was studied using SEM and optical microscope （OM）. The results show the reaction between the matrix Ti and Cu in the sintering assistant forms a glassy phase TiCu2. The composite has a good deformability at high temperature because oftbe existence of liquid phase TiCu.,, which can be compressed in 72.9% compression ratio and extruded in 16：1 extrusion ratio. The pores in the composite are obviously decreased and relative density is increased, and the composition of the composite is stable after high temperature plastic deformation. After high temperature extrusion, the liquid phase TiCus is transformed into small particles of 1μm-2μm, which are uniformly distributed aroung the periphery, of the matrix Ti particles.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2005年第12期1994-1997,共4页
Rare Metal Materials and Engineering
关键词
TiC/Ti复合材料
液相烧结
高温压缩
高温挤压
TiC/Ti composite
liqttid phase sintering
high temperature compression
high temperature extrusion
