メカニカルアロイング法によるNbB2分散Al3Nb複合材の作製

概要

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Elemental Al, Nb and B powders with the composition of Al3Nb-xvol%NbB2 (x=10-30) were mechanically alloyed (MA) in an Ar gas atmosphere. The results of X-ray diffraction indicated that an Al3Nb phase and a NbB2 phase, which was considered to be NbB2-x (with lesser stoichiometrical B content), were obtained in 72.0ks MA powders. The sintered compacts with high density were obtained by vacuum heating of the compacts of 72.0ks MA powders. Fine NbB2-x dispersed uniformly in the sintered compacts and its content increased according to the x value in A13Nb-xvol%NbB2. A part of NbB2-x obtained in the sinterd compacts was like a rod in shape. Many rod-like NbB2-x were formed in HIPed compacts which were processed at lower temperature than the sinterd compacts. TEM observation of the HIPed compacts revealed that rod-like NbB2-x, which was as small as nano-meter, precipitated on nano-sized Al3Nb matrix. The hardness of the HIPed compacts was about Hv1000 which was higher than that of Al3Nb.
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