The electrical resistivity vs temperature was determined for a bcc Cr+20 at.% Fe alloy from 4.2° to 300°K. The absence of any discontinuity in this curve indicates that the very high temperature-coefficient of the linear term of the specific heat previously found at that composition is not associated with a phase transformation between room temperature and 4.2°K. For bcc Cr-alloys with Fe contents increasing from 0 to 16 at.% Fe the resistivity vs temperature anomaly shifts from approximately 308°K to progressively lower temperatures, and the anomalous resistivity increase with decreasing temperature becomes progressively larger. It is quite possible that these anomalies are connected with antiferromagnetic-paramagnetic transition in the alloys considered.
Grazing incidence X-ray diffraction, performed on a 70 keY nitrogen implanted Ti-6AI-4V system, reveals phase instabilities, during the course of nitride formation. With the build up of unbound N atom concentration, for a dose of I x 1016 ions/cm 2, the surface region becomes a-rich, whereas, on precipitation of Ti-nitrides at a high dose of I x 1017 ions/cm 2, the/]-Ti phase reappears, at the surface and beyond the implanted zone. The low concentration of V and the strain in the nitrided zone, have led to radiation induced martensitic transformation of the fl-Ti phase.
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