摘要
利用Ti与B4C之间的化学反应,采用原位自生的方法制备了5%(体积分数)(TiB+TiC)(4∶1)/Ti-1100复合材料。用X射线和能谱进行了相分析,用金相显微镜(OM)和透射电镜(TEM)研究了锻造对复合材料组织的影响,并对铸态和锻造后的复合材料进行了高温拉伸对比试验。结果发现,利用该方法制备的复合材料中增强体分布均匀。锻造后复合材料由等轴状的α晶粒构成,α晶粒内部有大量的亚结构而且α晶粒的亚结构很不均匀,复合材料的强度和延伸率有很大的提高。锻造对复合材料的高温断裂方式也有明显的影响。
5 % （ volume fraction ） （ TiB ＋ TiC ）/Ti- 1100 composite was fabricated using in situ technology. Microstructure of the composite in cast and after forging was studied by optical microscopy （OM） and transmission electron microscopy （TEM）. Phase identification was performed by X-ray and energy dispersion X-ray spectrometer （EDS）. Mechanical properties of the composite in cast and after forging were tested by tensile tests at high temperature. It was found that the microstructure of the composite after forging consists of near equiaxed a grains totally. The substructures in a grains is very inhomogeneous. Compared to the samples in cast, there is an increase of an about 200- 300 MPa in ultimate tensile strength （UTS） for the forged samples. Forging has obvious effect on the fracture mode and fracture process of the composite, too.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2006年第2期236-240,共5页
Chinese Journal of Rare Metals
基金
国家优秀博士论文基金(04DZ14002)资助
关键词
钛基复合材料
锻造
组织
高温机械性能
in situ titanium matrix composites
forging
mechanical properties
