The 3<i>d</i> Electrons and Microdefects in Binary Ti-Al Alloys Studied by Positron Annihilation

Abstract

The behavior of 3d electrons and microdefects in binary Ti-Al alloys with Al contents from 47at.% to 53at.% have been studied by coincidence Doppler broadening and positron lifetime techniques. It has been found that the 3d electron signals in the spectra of binary Ti-Al alloys increase with Ti content. In Al-rich Ti-Al alloys, on increasing Al content, the open volume of defect on grain boundary increases while the density of free electron decreases. On the contrary, in Ti-rich Ti-Al alloys, on increasing Ti content, the open volume of defect on grain boundary decreases, and the electron density of the grain boundary increases.

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“…Briott et al [74] performed an analysis of these phases and conducted several mechanical tests to identify and characterize the defects present and fracture processes were proposed. Another study was performed on microdefects and 3D electron behavior in binary type Ti-Al alloys [75]. With a greater Al content, free electron density reduces but the open volume of grain boundary defects becomes larger, but with a greater Ti content, the contrary happens.…”