Kinetic analysis of Al3Ti intermetallic powder after mechanical treatment in hydrogen

Authors

Emilia Illekova, Institute of Physics, Slovak Academy of Science
Peter Svec, Institute of Physcis Slovak Academy of Science
David Wexler, University of WollongongFollow
Andrzej Calka, University of WollongongFollow

RIS ID

18537

Publication Details

Illekova, E., Svec, P., Wexler, D. & Calka, A. (2007). Kinetic analysis of Al3Ti intermetallic powder after mechanical treatment in hydrogen. Journal of Non-Crystalline Solids, 353 (18-21), 1970-1974.

Abstract

We present results of mechanochemical processing experiments performed on intermetallic powder, Al₃Ti milled under hydrogen and helium atmospheres using a magnetically controlled Uniball device. Milling products were investigated by X-ray diffractometry (XRD), transmission electron microscopy (TEM) and advanced differential thermal analysis (DTA and DSC). Milling in both H₂ and in He resulted in breakdown of the intermetallic structure and, after extended milling, formation of nanostructural products comprising, predominately, a solid solution of Ti in fcc Al, with some possible additional Al_1+xTi_1−x (x = 0.3) phase. Detailed kinetic analysis was preformed on the Al₃Ti sample milled for 6 days in hydrogen. Under isothermal annealing, the crystallization of the Al₅Ti₂ was found to follow the JMA kinetics, with constant activation energy E^∗ and Avrami exponent n decreasing from 2.5 to 1.5.