Structural and mechanical stability of the nano-crystalline Ni-Ti (50.9 at.% Ni) shape memory alloy during short-term heat treatments

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F14%3A43898120" target="_blank" >RIV/60461373:22310/14:43898120 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.intermet.2013.12.013" target="_blank" >http://dx.doi.org/10.1016/j.intermet.2013.12.013</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.intermet.2013.12.013" target="_blank" >10.1016/j.intermet.2013.12.013</a>

Result language
angličtina
Original language name
Structural and mechanical stability of the nano-crystalline Ni-Ti (50.9 at.% Ni) shape memory alloy during short-term heat treatments
Original language description
In this study, the nano-crystalline Nitinol (50.9 at.% Ni) was prepared by 40% cold deformation. Subsequently it was subjected to 15-min-heat treatments at 300-550 degrees C. Changes of the structure and mechanical properties were studied by transmissionelectron microscopy, micro X-ray diffraction, differential scanning calorimetry, Vickers hardness measurements, tensile and bend-type fatigue testing. It was shown that the cold drawn material contains textured nano-crystalline B2 grains of 50 nm in thickness and a high concentration of lattice defects. Its tensile strength, hardness and fatigue life were 1521 MPa, 421 HV0.05 and 2435 bending cycles to fracture, respectively. After heat-treatment up to 450 degrees C/15 mm the material underwent Ni4Ti3precipitation and partial recovery processes. Heat-treatments at above 450 degrees C induced recrystallization, grain and precipitate growth. Hardness and fatigue lives showed maxima of 692 HV0.05 and 5883 cycles, respectively, after heat
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JG - Metallurgy, metal materials
OECD FORD branch
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Project
<a href="/en/project/GBP108%2F12%2FG043" target="_blank" >GBP108/12/G043: Interface controlled properties of micro/nanocrystalline materials for advanced structural applications, biodegradable implants and hydrogen storage</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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