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Mechanical Disordering of Cubic Intermetallics By Unconventional Methods of Cold-Work and Their Reordering Upon Annealing

Published online by Cambridge University Press:  10 February 2011

R. A. Varin ,
J. Bystrzycki  and
A. Calka
R. A. Varin
Affiliation:
Department of Mechanical Engineering, University of Waterloo, Waterloo, Canada, N2L 3G1, ravarin @ engmail.uwaterloo.ca
J. Bystrzycki
Affiliation:
Department of Materials Technology, Military University of Technology, KALISKIEGO 2, 01–489, Warsaw, Poland
A. Calka
Affiliation:
Department of Materials Engineering, University of Wollongong, Wollongong, New South Wales 2522, Australia
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Abstract

Two unconventional methods of cold-work: (a) controlled mechanical (ball) milling (under shear conditions), and (b) shock-wave (explosive) loading at ˜5 GPa shock pressure were applied to two cubic intermetallics: (a) Mn-stabilized cubic (L12) titanium trialuminide (AI3Ti(Mn)) and (b) B2 iron aluminide (FeAl). The long-range order (LRO) parameter S of both intermetallics decreases and their lattice constants increase with increasing milling time providing strong evidence that the mechanical milling disorder is due to antisite-atom pairs. A nanocrystalline structure is being formed in both intermetallics upon milling. A shock-wave loading gives rise to only a partial disorder of both A13Ti(Mn) and FeAl but their lattice constants are not affected (no point defects formation). Annealing at 600°C results in the restoration of LRO and lattice constants as well as microstructural evolution in Fe-45A1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK5.31.1
Copyright
Copyright © Materials Research Society 1999

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References

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