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Deformation and Ductility in Alloys Based on Al3 Ti

Published online by Cambridge University Press:  26 February 2011

David G. Morris  and
Reto Lerf
David G. Morris
Affiliation:
Institute of Structural Metallurgy, University of Neuchâtel, 2000 Neuchâtel, Switzerland
Reto Lerf
Affiliation:
Institute of Structural Metallurgy, University of Neuchâtel, 2000 Neuchâtel, Switzerland
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Abstract

Titanium trialuminide alloys suffer problems of intense segregation during solidification and extreme brittleness when subjected to tensile stresses. In this study, spray forming techniques have been used to obtain homogeneous materials of fine microstructure, containing various second phase particles, and the deformation behaviour of these materials examined over a range of temperatures.

The microstructure and deformation behaviour of an iron-modified titanium trialuminide with the L12 structure is reported here.Deformation mechanisms are interpreted by analysis of dislocation structures and further confirmation is obtained by activation volume measurements: the importance of Peierls effects at low temperatures and cross slip at high temperatures is shown. The material remains brittle in tension both at room temperature and at high temperatures: the second phase particles in the material are yet not present in sufficient volume fraction to greatly affect plastic behaviour.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 305
Copyright
Copyright © Materials Research Society 1991

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References

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