Al–5 Ti–1 Band Al–1 Ti–0·4B alloys have been held at 750° and 1000°C for different periods of time before being cooled at a rate of ∼ 1K S−1. The solidification process was followed by cooling-curve analysis which revealed a metastable phase as well as a ‘pre-peritectic’ reaction. The metastable phase was shown to grow preferentially on existing Al3Ti crystals during cooling of the melt from a high temperature. Holding the melt for 3–4h at 750°C transformed the metastable system into the stable one. The pre-peritectic reaction was found to occur at ∼672°C.
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