Strength of hydrogen-free and hydrogen-doped Ni50Ti50 shape memory platelets

0507588 - ÚFM 2020 RIV US eng J - Journal Article
Weiser, Adam - Buršíková, V. - Jarý, Milan - Dymáček, Petr - Dugáček, J. - Frenzel, J. - Čermák, Jiří - Dlouhý, Antonín
Strength of hydrogen-free and hydrogen-doped Ni50Ti50 shape memory platelets.
Scripta Materialia. Roč. 162, MAR (2019), s. 151-155. ISSN 1359-6462. E-ISSN 1872-8456
R&D Projects: GA ČR(CZ) GA15-16336S; GA MŠMT(CZ) LQ1601; GA MŠMT LM2015069
Institutional support: RVO:68081723
Keywords : Shape memory alloy * Hydrogen charging * Small-punch test * Nano-indentation * Transmission electron microscopy
OECD category: Materials engineering
Impact factor: 5.079, year: 2019
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S1359646218306730?via%3Dihub

Small-punch and nano-indentation tests were used for the first time to probe strength of 500 μm thin Ni50Ti50 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.
Permanent Link: http://hdl.handle.net/11104/0299687