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Title
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Special microstructures and twin features in at small hysteresis
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Author
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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. |
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Language
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English
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Source (journal)
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Diffusion and defect data : solid state data : part B : solid state phenomena. - Vaduz, 1988, currens
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Publication
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Vaduz
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2011
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ISSN
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1012-0394
[print]
1662-9779
[online]
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DOI
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10.4028/WWW.SCIENTIFIC.NET/SSP.172-174.105
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Volume/pages
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172/174
(2011)
, p. 105-110
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ISI
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000303359700016
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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