Abstract
The pre-martensitic phenomenon in Ni 51 Ti 49 has been studied by positron lifetime spectroscopy which is quite sensitive to electronic-structural changes of matter. In this work we have found an anomalous positron lifetime change above martensitic transformation temperature of Ni 51 Ti 49 : positron lifetime increases anomalously with decreasing temperature even at temperatures 100 degrees higher than the M s temperature of the alloy. Almost the same change in positron lifetime also has been observed on the heating run with little hysteresis, which clearly indicates that the observed pre-martensitic change of positron lifetime is due to the intrinsic electronic-structural change of NiTi alloys which causes so-called pre-martensitic phenomena.
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