抄録
TiAl-TiB2 composites with 0, 10, 15 and 20vol%TiB2 were produced by MA-HIP method using pure Ti, Al and TiB2 powders. Microstructures and mechanical properties of the composites at elevated temperatures were investigated as well as MA process. Obtained results are as follows. The partial amorphization was found during MA process even in powders containing TiB2 particles. Microstructures of HIPed compacts tend to become finer with increase of volume percent of TiB2. Compacts with the addition of TiB2 particles were consisting of TiAl, Ti3Al and TiB2 phases. herefore, it was confirmed that there was little reaction between TiAl and TiB2 particles during sintering. The flow stress was increased with increase of TiB2 volume percent, although the increment of flow stress by the effect of dispersing of TiB2 decreased as the temperature rose. The strain rate sensitivity exponents (m values) were found to be larger than 0.3 at 1373K for any specimen.
