Abstract
We present results of mechanochemical processing experiments performed on intermetallic powder, Al 3Ti 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 H 2 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+ x Ti 1− x ( x = 0.3) phase. Detailed kinetic analysis was preformed on the Al 3Ti sample milled for 6 days in hydrogen. Under isothermal annealing, the crystallization of the Al 5Ti 2 was found to follow the JMA kinetics, with constant activation energy E ∗ and Avrami exponent n decreasing from 2.5 to 1.5.
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