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Deformation of a HF-V-NB C15 Laves Phase

Published online by Cambridge University Press:  01 January 1992

Fuming Chu  and
David P. Pope
Fuming Chu
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, U.S.A.
David P. Pope
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, U.S.A.
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Abstract

We have performed compression tests on Hf14V64Nb22 at both room temperature and elevated temperatures with different strain rates to study the deformation modes of the ternary C15 Laves phase based on HfV2. At room temperature the alloy exhibits fair ductility and is insensitive to strain rate. TEM observation revealed that the major deformation modes at room temperature are {111}<112> mechanical twinning. Compression tests up to 1000°C, combined with SEM and TEM examinations, revealed that the mechanical properties can be divided into three temperature regions: at low temperatures the alloy is fairly ductile due to the formation of deformation twins, in the intermediate temperature region the alloy exhibits a ductility minimum, and at high temperatures (>0.65Tm) the alloy shows large plastic deformations via 1/2<110> dislocation slip. A new deformation twinning mechanism is proposed based on synchroshear mechanism.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 561
Copyright
Copyright © Materials Research Society 1995

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References

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