Abstract
Ti-9.62Fe alloy was quenched from 1000°C into ice water. The athermal ω phase has been observed at room temperature. In the as-quenched alloy the resistivity, Mössbauer recoil-free fraction, and X-ray diffraction all show anomalous variations with temperature. The anomalous variations existing in a wide range of temperatures below RT are found to be reversible. The explanation of the anomalous phenomena is based on the instability of the β phase, which shows the localized soft modes. The instability can be referred to as a precursor effect of ω transformation. One of the reasons that the precursor effect can be observed in a wide range of temperatures below RT is due to the slightly higher oxygen concentration and as a result the oxygen atoms suppress the formation of the ω phase. The partially filled 3d-band of this alloy may have some influence on the precursor effect of the ω transformation.
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