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In this study phase transformations in metastable beta Ti15Mo alloy were investigated by an in situ electrical resistance measurement in a wide range of temperatures from 196• C to 850• C. Dierent temperature ranges of the evolution of electrical resistance were correlated with underlying phase transformations. In the low temperature range, stage I (from 196• C to 220• C) the decrease of electrical resistance with increasing temperature is caused by the dissolution of ω ath (formed during quenching by athermal shue transformation) which is accompanied by the relaxation of lattice strain, while the diusional assisted growth of ωiso in the range from 220 • C was conrmed by temperature cycling during repeated in situ resistance runs from RT. Pre-ageing of samples at 300• C promotes the formation of ωiso particles. Subsequently, ω ath particles are not created, which is fully consistent with electrical resistance measurements. The presence of ω ath and the orientation relationship between ω and β were identied by the electron diraction.

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