Abstract
When TiAl3 intermetallics were fabricated by the reactive synthesis of titanium and aluminum powder, the correlation between the speed and intensity of the reaction was stable. The magnesium-addition method with the addition of trace magnesium broke this correlation for the first time. Magnesium controlled the reaction in three stages in different ways: the initial melting and reaction area, the dynamic equilibrium formed by the diffusion rate consistent with the liquidus, and the high flowability eutectic liquid phase. The diffusion state of magnesium in each stage and the eutectic liquid phase formed with aluminum were the critical factors.
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