Publications

Strength of hydrogen-free and hydrogen-doped Ni 50 Ti 50 shape memory platelets

Weiser, A. and Buršíková, V. and Jarý, M. and Dymáček, P. and Dugáček, J. and Frenzel, J. and Čermák, J. and Dlouhý, A.

SCRIPTA MATERIALIA
Volume: 162 Pages: 151-155
DOI: 10.1016/j.scriptamat.2018.10.044
Published: 2019

Abstract
Small-punch and nano-indentation tests were used for the first time to probe strength of 500 μm thin Ni 50 Ti 50 shape memory platelets in their hydrogen-free and hydrogen-doped states. Results show excellent reproducibility and suggest that hydrogen penetrates the alloy more efficiently during the cathodic charging at ambient temperatures as compared to heat treatments in a controlled hydrogen atmosphere. Hydrogen content exceeding 100 wtppm results in a retransformation from the B19′ martensite to the R lattice and causes a systematic drop of the rupture strength. The retransformation events in thin surface lamellae were documented by the transmission electron microscopy. © 2018 Elsevier Ltd

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