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Mechanical Properties and Dislocation Structures in TiAl Alloys with Varying Aluminum Contents

Published online by Cambridge University Press:  01 January 1992

S. Sriram ,
Vijay K. Vasudevan  and
Dennis M. Dimiduk
S. Sriram
Affiliation:
Dept. of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH, 45221
Vijay K. Vasudevan
Affiliation:
Dept. of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH, 45221
Dennis M. Dimiduk
Affiliation:
Wright Laboratory, Materials Directorate, Wright-Patterson AFB, Dayton, OH, 45433.
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Abstract

Binary, coarse-grained polycrystalline Ti-48, 50 and 52 Al (in at.%) alloys, containing low (∼250 wt.ppm) levels of interstitials (O+N) have been deformed at various temperatures in compression and four-point bending. The 0.2% proof strength-temperature profiles are observed to comprise of three distinct regimes. Differences in the material response between bending and compression modes of deformation have been observed. Importantly, in both cases a flow stress anomaly is observed in the 50 and 52 Al alloys. Dislocation fine structures of samples deformed in compression, have been observed in the TEM. Analyses suggests the possible influence of Al contents on the line directions of dislocations, superdislocation dissociation modes, SISF dissociation distances and hence planar fault energies. Distinct differences in the deformation structures at RT and at the flow stress peak temperature (800°C) have been observed. These results are presented and discussed in relation with the observed mechanical properties.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 737
Copyright
Copyright © Materials Research Society 1995

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