Special Microstructures and Twin Features in Ti50Ni50-X(Pd,Au)X at Small Hysteresis

Abstract:

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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-xPdx and Ti50Ni50-xAux where 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.

Info:

Periodical:

Solid State Phenomena (Volumes 172-174)

Edited by:

Yves Bréchet, Emmanuel Clouet, Alexis Deschamps, Alphonse Finel and Frédéric Soisson

Pages:

105-110

DOI:

10.4028/www.scientific.net/SSP.172-174.105

Citation:

R. Delville et al., "Special Microstructures and Twin Features in Ti50Ni50-X(Pd,Au)X at Small Hysteresis", Solid State Phenomena, Vols. 172-174, pp. 105-110, 2011

Online since:

June 2011

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$35.00

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