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TiB, and A1 base composite powders, which will offer a weight-saving improvement in stiffness, were produced by combustion synthesis of Ti, Al, and B ternary powder mixtures. Finely dispersed TiB, was synthesized by reacting a mixture of Ti, Al, and B in the molar ratio of I : I :4. The grain size of the TiB, formed was (0.5 pm, which was much smaller than that obtained from the reaction of a mixture of Ti, Al, and B in the molar ratio I : I :2. These results are discussed in light of the reaction propagating velocity a9d heat removal during the combustion synthesis process. [

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