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Atomic-Scale Design for Enhanced Low Temperature Twinning in ZrCr2-Based Laves Phases

Published online by Cambridge University Press:  15 February 2011

W.-Y. Kim  and
D.E. Luzzi
W.-Y. Kim
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA, wykim@seas.upenn.edu
D.E. Luzzi
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA, luzzi@lrsm.upenn.edu
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Abstract

Recently, we have designed and produced several transition metal Laves phases with low-temperature compressive ductility. These improved alloys demonstrate that manipulation of atomic-scale structure can have a drastic effect on meso-scale deformation behavior. To gain a basic understanding of the role of atomic-scale substitutions on the room temperature mechanical properties, a systematic investigation of the Laves ZrCr2-based alloy system alloyed with Hf, Nb, Ta and Ti was conducted and is reported here. Extensive room temperature ductility was obtained in the Hf-alloyed ternary Laves phase alloy system. Mechanical twinning is found to be the predominant deformation mode at room temperature in this alloy system. It is emphasized that Hf substitution in the Zr sublattice of ZrCr2 may play the most prominent role in changing the local electronic structure resulting in easier twinning.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 578: Symposia A/C – Multiscale Phenomena in Materials - Experiments in Modeling , 1999 , 99
Copyright
Copyright © Materials Research Society 2000

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References

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