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Effects of HSHPT on the martensitic transformation behaviour of an NiTi alloy
Published in EDP Sciences
2015
Volume: 33
   
Abstract
High speed high pressure torsion (HSHPT) is a novel severe plastic deformation technique that is used to produce bulk ultrafine-grained nickel-titanium shape memory alloys. In this study, the effect of grain refinement on phase transformation was investigated in a near equiatomic NiTi shape memory alloy subjected to processing by this technique. Phase transformations involving different degrees of deformation and stability of thermally-induced phase transformations were analyzed by differential scanning calorimetry (DSC). The measurements suggest that the martensitic transformation occurred even when the highest degree of deformation was applied. Optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigations bring to light that the true strain applied controls the evolution of the microstructure. The results are presented and discussed in detail in this paper. © Owned by the authors, published by EDP Sciences, 2015.
About the journal
JournalData powered by TypesetMATEC Web of Conferences
PublisherData powered by TypesetEDP Sciences
ISSN2261236X
Open AccessYes
Concepts (20)
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    Differential scanning calorimetry
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    Electron microscopy
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    Grain refinement
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    High resolution transmission electron microscopy
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    INTERMETALLICS
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    Phase transitions
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    Scanning electron microscopy
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    Shape memory effect
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    Titanium alloys
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    Torsional stress
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    Transmission electron microscopy
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    DEGREE OF DEFORMATIONS
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    Evolution of the microstructure
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    HIGH PRESSURE TORSIONS
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    NICKEL-TITANIUM SHAPE MEMORY ALLOYS
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    NITI SHAPE MEMORY ALLOYS
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    SEVERE PLASTIC DEFORMATIONS
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    Thermally induced
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    ULTRA-FINE-GRAINED
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    Martensitic transformations