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Abstract
Brittle coarse Ti–Fe compound seriously deteriorates the joint strength of Ti and stainless steel, therefore it is necessary to study the formation mechanism of coarse Ti–Fe compound. In the present work, the factors influencing the formation and growth of coarse Ti–Fe compound have been studied, primarily using the eutectic reaction method between pure Ti and pure Fe. The results show that the existence of the supersaturated β-Ti(Fe) solid solution is a precondition for the formation of the coarse Ti–Fe compound, and the formation of supersaturated β-Ti(Fe) solid solution is due to high process parameters. When the temperature is 1100°C and the holding time is < 10 s there is no supersaturated β-Ti(Fe). Subsequently no coarse Ti–Fe compound forms in the eutectic reaction zone. However, when the joining temperature and/or prolonging the holding time is enhanced, coarse block Ti–Fe compound forms and grows after the appearance of supersaturated β-Ti(Fe) solid solution. The formation and growth of the coarse block Ti–Fe compound can be constrained through properly controlling the process parameters (temperature, time and exterior force) to get a comparatively thin reaction zone, which causes less supersaturated β-Ti(Fe) solid solution.
