摘要
利用放电等离子烧结（SPS）技术，原位制备Ti2AlC／TiAl（Nb，B）复合材料，并对其进行快速升温热处理。采用残余强度法对复合材料在225～825℃范围内的抗热震性能进行测试。结果表明：随热震温差的升高，试样显微结构变得疏松，内部出现孔洞和裂纹，导致材料热震后强度下降；热处理后复合材料的抗热震性能明显提高，断裂方式的改变及显微组织的细化是产生这一现象的主要原因。
In this paper, the spark plasma sintering （SPS） technology was used tn-situ to fabricate the Ti2AlC/TiAl（Nb, B） composites. The thermal shock resistances were investigated by residual strength method from 225 ℃ to 825 ℃ for the composites. It＇s shown that with increasing the temperature difference of thermal shock, the microstructur~ became looser, and holes and cracks appeared inside, as a result, the strength of thermal shock resistances decreased. But the thermal shock resistance of composites were obviously increased after heat treatment due to the change of fracture mode and the refinement of microstructures.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第7期1149-1152,共4页
Rare Metal Materials and Engineering
基金
山东省自然科学基金重点项目资助(Z2003F02)
