Title
Special microstructures and twin features in <tex>$Ti_{50}Ni_{50-x}(Pd,Au)_{x}$</tex> at small hysteresis Special microstructures and twin features in <tex>$Ti_{50}Ni_{50-x}(Pd,Au)_{x}$</tex> at small hysteresis
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Vaduz ,
Subject
Physics
Source (journal)
Diffusion and defect data : solid state data : part B : solid state phenomena. - Vaduz, 1988, currens
Volume/pages
172/174(2011) , p. 105-110
ISSN
1662-9779
ISI
000303359700016
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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-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.
E-info
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