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Trans Tech Publications, Solid State Phenomena, (172-174), p. 105-110, 2011

DOI: 10.4028/www.scientific.net/ssp.172-174.105

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Special Microstructures and Twin Features in Ti<sub>50</sub>Ni<sub>50-X</sub>(Pd,Au)<sub>X</sub> at Small Hysteresis

Journal article published in 2011 by Remi Delville, Hui Shi, Richard D. James ORCID, Dominique Schryvers
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The breaking of symmetry due to atomic displacements in the austenite-martensite phase transformation generally leads to their crystallographic incompatibility. Energy minimizing accommodation mechanisms such as martensite twinning have been recently shown to be a source of hysteresis and irreversible plastic deformation. Compatibility between the two phases can however be achieved by carefully tuning lattice parameters through composition change. A dramatic drop in hysteresis and novel microstructures such as a lowering of the amount of twin lamella are then observed. Related theoretical and simulation works also support the existence of such microstructures including peculiar self-accommodating configurations at near-compatibility. We present the transmission electron microscopy (TEM) study of these novel microstructures for the alloy systems Ti50Ni50-xPdxand Ti50Ni50-xAuxwhere the composition was systemically tuned to approach perfect compatibility. High resolution imaging of the interface between austenite and martensite supplies evidences of compatibility at the atomic level.