Nanocrystalline Incommensurate Structures in Ti-TM Alloys

摘要

Nanocrystalline ω structures in quenched Ti_1-xV_x (x= 0.13 - 0.40) and Ti_1-yFe_y (y=0.065 - 0.20) were studied by means of XRD and TEM methods. XRD data at 20 °C and - 195 °C were obtained for monocrystalline samples. Anomalous reversible increase of peak intensities of ω reflections at low temperature accompanied by decrease of their width was observed for alloys with valence electron concentrations 4.19-4.25 e/a. Correlation between temperature dependences of intensity of ω reflections and resistivity was observed for alloys in the quenched state and after low temperature annealing. The nature of nanoscale structures consisting of ω clusters of 4 different crystallographic orientations in BCC matrix is discussed in connection with electronic structure of the alloys.