Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 662, Issue -, Pages 564-577Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.03.004
Keywords
NiTi shape memory alloy; Heat treatment; Plastic deformation; Fracture; Transmission electron microscopy
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Funding
- Science Foundation of Ireland [11/SIRG/B2135]
- Science Foundation Ireland (SFI) [11/SIRG/B2135] Funding Source: Science Foundation Ireland (SFI)
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An investigation was carried out into the influence of the annealing temperatures on the thermo-mechanical behavior of Ti-rich NiTi alloy with regard to transformation temperatures, mechanical properties at room temperature and microstructure evolution under deformation. It was found that annealing above the recrystallization temperature (600 degrees C) modulated the mechanical behavior of the alloy significantly. Based on tensile and DSC analysis, it was observed that by increasing the annealing temperature, the shape memory behavior of the alloys improved. Scanning and transmission electron microscopy were used to investigate the fracture surfaces and microstructural evolution of the NiTi samples after failure. Fractography revealed the brittle fracture area produced through the propagation of cleavage cracks; however, ductile fracture via nucleation growth and coalescence of micro-dimples in the martensitic phase at room temperature were also observed. During plastic deformation, the NiTi alloy was also observed to undergo a detwinning process, dislocation slip and the formation of submicrocrystalline grains, nanocrystallization and amorphous bands. (C) 2016 Elsevier B.V. All rights reserved.
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