抄録
The 70TiB2-30Fe3Al mass% cermets were fabricated from a mixture of TiB2, Fe and Al powders utilizing a diffusive reaction between Fe and Al. The mechanical milling of TiB2 and Fe were carried out for 0.3-2.4 ks to obtain the milled powder with different distribution state of Fe. The coercive force of the milled powder increased, when the milling duration over 1.2 ks. The cross sectional microstructure of the powder milled for 2.4 ks showed that the Fe was finely distributed and those shapes were deformed to flat. The Al was subsequently added to the TiB2 and Fe milled powder, and then the mixture was consolidated at 1473 K for 120 s using a plus current sintering method. In the sintered compact made from the powder milled for 0.3 ks, the Fe was inhomogeneously distributed and un-reacted pure Fe was observed. In contrast, the Fe was uniformly distributed and Fe3Al formed in the sintered compact prepared from the powder milled for 2.4 ks.
