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Craciunescu, Corneliu
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Publications (8/8 displayed)
- 2015Fracture modes during severe plastic deformation of NiTi shape memory alloyscitations
- 2015Surface effects in pulsed laser beam irradiated shape memory alloys
- 2013In situ structural characterization of laser welded NiTi shape memory alloyscitations
- 2012Structural characterization by x-ray diffraction of laser welded shape memory alloys
- 2011Concurrent Effect of Melt-spinning and Severe Plastic Deformation on Shape Memory Alloy Ribbons by Simultaneous XRD and Electrical Resistivity Measurements
- 2011Chapter 7 - Shape memory alloys: existing and emerging applications
- 2011Laser beam interaction with Ni-Mn-Ga ferromagnetic shape memory alloyscitations
- 2011Simultaneous XRD and Electrical Resistivity Measurements of the phase transitions in Co-Ni-Ga ferromagnetic shape memory alloy system
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article
Fracture modes during severe plastic deformation of NiTi shape memory alloys
Abstract
<p>The effects of severe plastic deformation on the surface micro-structural characteristics of NiTi shape memory alloys were observed after one single pass using the equal channel angular pressure technique. The analysis of the deformation and fracture showed distinct features related to the composition of the alloys, the temperature of the process, and the surface effects during the relative sliding in the die. In samples deformed at room temperature, the cracks initiated at the surface under tensile stress are amplified during the extrusion in the concurrent channel. The multiple cracks that develop during the friction process between the surfaces of the sample and channels of the die are the main cause for the fracture, even in materials that are less brittle, incorporating a smaller fraction of Ti2Ni precipitates and showing ductile fracture. A differential state of stress appears to exist in the deformed alloys starting from one surface to the other.</p>