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

Remi Delville; Hui Shi; Richard D. James; Dominique Schryvers

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

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HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Special Microstructures and Twin Features in...

Special Microstructures and Twin Features in Ti₅₀Ni_50-X(Pd,Au)_X at Small Hysteresis

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 Ti₅₀Ni_50-xPd_x and Ti₅₀Ni_50-xAu_x 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.

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Periodical:

Solid State Phenomena (Volumes 172-174)

Pages:

105-110

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.105

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Online since:

June 2011

Authors:

Remi Delville, Hui Shi, Richard D. James, Dominique Schryvers

Keywords:

Hysteresis, Martensitic Transformation (MT), Solid-Solid Interface, TEM

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References

[1] J. Cui, Y.S. Chu, O.O. Famodu, Y. Furuya, J. Hattrick-Simpers, R.D. James, A. Ludwig, S. Thienhaus, M. Wuttig, Z. Zhang and I. Takeuchi: Nat. Mater. Vol. 5 (2006), p.286.