| KUBENOVA, M., Jakub ZÁLEŠÁK, J. CERMAK a A. DLOUHY. Impact of hydrogen-assisted heat treatments on microstructure and transformation path in a Ni-rich NiTi shape memory alloy. Journal of Alloys and Compounds. LAUSANNE: ELSEVIER SCIENCE SA, 2013, roč. 577, NOV, s. "S287"-"S290", 4 s. ISSN 0925-8388. Dostupné z: https://dx.doi.org/10.1016/j.jallcom.2012.07.096. |
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@article{1593021,
author = {Kubenova, M. and Zálešák, Jakub and Cermak, J. and Dlouhy, A.},
article_location = {LAUSANNE},
article_number = {NOV},
doi = {http://dx.doi.org/10.1016/j.jallcom.2012.07.096},
keywords = {Heat treatment atmosphere; Nickel-rich NiTi shape memory alloys; Differential scanning calorimetry; Transmission electron microscopy; Ni4Ti3 precipitation},
language = {eng},
issn = {0925-8388},
journal = {Journal of Alloys and Compounds},
title = {Impact of hydrogen-assisted heat treatments on microstructure and transformation path in a Ni-rich NiTi shape memory alloy},
url = {https://www.sciencedirect.com/science/article/pii/S0925838812013138},
volume = {577},
year = {2013}
}
TY - JOUR
ID - 1593021
AU - Kubenova, M. - Zálešák, Jakub - Cermak, J. - Dlouhy, A.
PY - 2013
TI - Impact of hydrogen-assisted heat treatments on microstructure and transformation path in a Ni-rich NiTi shape memory alloy
JF - Journal of Alloys and Compounds
VL - 577
IS - NOV
SP - "S287"-"S290"
EP - "S287"-"S290"
PB - ELSEVIER SCIENCE SA
SN - 09258388
KW - Heat treatment atmosphere
KW - Nickel-rich NiTi shape memory alloys
KW - Differential scanning calorimetry
KW - Transmission electron microscopy
KW - Ni4Ti3 precipitation
UR - https://www.sciencedirect.com/science/article/pii/S0925838812013138
L2 - https://www.sciencedirect.com/science/article/pii/S0925838812013138
N2 - We report results of differential scanning calorimetry and transmission electron microscopy experiments in which martensitic transformations and microstructure of Ti-50.9 at%Ni shape memory samples were investigated after heat treatments in controlled gaseous environments. The heat treatments were performed in mixtures consisting of hydrogen and helium with an overall pressure of 900 mbar. The cylindrical samples were heat treated either in a Regime I (850 degrees C/1800 s/WQ) or in a Regime II (the Regime I plus 450 degrees C/3600 s/WQ). DSC charts clearly document that the B2 -> B19' or R -> B19' martensitic phase transitions diminish after Regime I and Regime II treatments with increasing partial pressure of hydrogen. We show that the hydrogen rich environments do not cause variations in size and density of Ni4Ti3 particles. Conversely, the Regime I heat treatments assisted by hydrogen result in 1/2 (111)(B2) diffuse intensity maxima in selected area electron diffraction patterns. These maxima were not observed after heat treatments in hydrogen deficient atmospheres. Therefore, we suggest that the gradual suppression of the martensitic transformation may be related to either chemical and/or strain modulations of the B2 lattice triggered by the presence of interstitial hydrogen atoms.
ER -
KUBENOVA, M., Jakub ZÁLEŠÁK, J. CERMAK a A. DLOUHY. Impact of hydrogen-assisted heat treatments on microstructure and transformation path in a Ni-rich NiTi shape memory alloy. \textit{Journal of Alloys and Compounds}. LAUSANNE: ELSEVIER SCIENCE SA, 2013, roč.~577, NOV, s.~''S287''-''S290'', 4 s. ISSN~0925-8388. Dostupné z: https://dx.doi.org/10.1016/j.jallcom.2012.07.096.
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