Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/92530

Title

The kinetics of two-stage formation of TiAl3 in multilayered Ti/Al foils prepared by accumulative roll bonding

Author(s)

Yang, Dengke;  Hodgson, Peter;  Wen, Cui'e

Abstract

The solid-state reactions of Ti/Al multilayered samples produced by Accumulative Roll Bonding (ARB) have been investigated using differential scanning calorimetry, X-ray diffraction and scanning electron microscopy. The kinetics of the formation of the intermetallic compound TiAl3 was highlighted. Experimental evidence and analysis of the data shows that, there was a two-stage process in the formation of TiAl3 in the ARB Ti/Al reactive multilayered samples. Calorimetric and microstructural analyses also suggest that the interdiffusion of Al and Ti which led to solid solutions preceded the formation of intermetallic compounds. Despite the apparent chaos in the thickness of the ARB multilayered samples, the distribution of layer spacing did not become broad enough to lose the main features of the double exothermal behaviour. Isothermal DSC shows a larger Avarami constant in ARB Ti/Al multilayered structures than was found in Ti/Al thin films. A modified model based on thin films was set up to describe the kinetic characteristics of the formation of the intermetallic compound TiAl3 in ARB samples.

Publication type

Journal article

Source

Intermetallics, Vol. 17, no. 9 (Sep 2009), pp. 727-732

Publication year

2009

FOR Code(s)

0306 Physical Chemistry (Incl. Structural);  0914 Resources Engineering and Extractive Metallurgy

Keyword(s)

Accumulative Roll Bonding;  ARB;  Calorimetry;  Intermetallics;  Rolling cycles;  Trialuminides

Publisher

Elsevier

ISSN

0966-9795

Publisher URL

http://dx.doi.org/10.1016/j.intermet.2009.02.015

Copyright

Crown Copyright © 2009. Published by Elsevier Ltd. All rights reserved.

Peer reviewed