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The Dislocation Structure and Deformation Mechanism of Tib2/Nial Composites

Published online by Cambridge University Press:  26 February 2011

L. Wang  and
R.J. Arsenault
L. Wang
Affiliation:
Metallurgical Materials Laboratory, Department of Materials and Nuclear Engineering University of Maryland, College Park, Maryland 20742–2115
R.J. Arsenault
Affiliation:
Metallurgical Materials Laboratory, Department of Materials and Nuclear Engineering University of Maryland, College Park, Maryland 20742–2115
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Abstract

Dislocation structures in 0, 10, and 20 V% TiB2/NiAl composites have been thoroughly investigated with a 1 MeV HVEM after compression testing at 760–1000° C. Samples with 0 and 10 V% TiBl2/NiAl additions have almost identical dislocation structures which can be described as a<100> screw dislocations with extensive jogs and superjoqs. Prismatically punched dislocations were observed in all of the deformed composites and deformed samples of 20 V% TiB2/NiAl had extensive dislocation generation around the particles. Dislocation density, grain size, and the tendency for dislocation reactions or networks forming during deformation decrease as the volume fraction of TiB2 increases. Also, since a predominance of screw dislocation was observed, the rate controlling process is not likely to be dislocation annihilation or climb, but dislocation generation. The grain size refinement could play an important role in the strengthening of the composites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 1063
Copyright
Copyright © Materials Research Society 1991

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References

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