Hanuš Seiner
Academy of Sciences of the Czech Republic
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Featured researches published by Hanuš Seiner.
Phase Transitions | 2008
Hanuš Seiner; P. Sedlák; Michal Landa
Micromechanism of the shape recovery process is optically observed in single crystals of the Cu–Al–Ni shape memory alloy. Formation of X and λ-interfaces (interfacial microstructures with two intersecting habit planes) is documented, both in a thermal gradient and during a homogeneous heating. The observed growth mechanisms (i.e. mechanisms of nucleation and growth of the twinned structures) are described and analysed. Weakly non-classical boundaries between austenite and two crossing twinning systems are also documented.
Journal of Applied Physics | 2012
Oleg Heczko; Hanuš Seiner; Petr Sedlak; Jaromír Kopeček; Michal Landa
Elastic constants of the cubic Ni2MnGa austenite phase and corresponding mechanical damping were determined in the temperature range from 220 K to 400 K and magnetic field up to 2 T using ultrasound pulse-echo method and resonant ultrasound spectroscopy. The shear coefficient c′ increases from 3.6 GPa in the demagnetized state to 5.9 GPa at magnetic saturation, whereas the damping decreased nearly six times. The changes of other elastic constants, c11 and c44 with an applied field were less than 1%. In the ferromagnetic state, the c′ was proportional to the square of magnetization. Above the Curie point, the coefficient c′ and damping were field-independent. The anomalous shear softening is attributed to strong magnetoelastic coupling enhanced by low magnetic anisotropy.
Journal of the Acoustical Society of America | 2010
Michal Růžek; Petr Sedlak; Hanuš Seiner; Alena Kruisová; Michal Landa
In this paper, linearized approximations of both the forward and the inverse problems of resonant ultrasound spectroscopy for the determination of mechanical properties of thin surface layers are presented. The linear relations between the frequency shifts induced by the deposition of the layer and the in-plane elastic coefficients of the layer are derived and inverted, the applicability range of the obtained linear model is discussed by a comparison with nonlinear models and finite element method (FEM), and an algorithm for the estimation of experimental errors in the inversely determined elastic coefficients is described. In the final part of the paper, the linearized inverse procedure is applied to evaluate elastic coefficients of a 310 nm thick diamond-like carbon layer deposited on a silicon substrate.
Smart Materials and Structures | 2016
Ladislav Straka; Jan Drahokoupil; O Pacherová; K Fabiánová; V Kopecký; Hanuš Seiner; Hannu Hänninen; Oleg Heczko
In search for the origins of the extraordinary low twinning stress of Ni-Mn-Ga magnetic shape memory alloys we studied the thermally induced changes of structure in Ni
Acta Materialia | 2017
Robert Niemann; Anja Backen; Sandra Kauffmann-Weiss; Christian Behler; U. K. Rößler; Hanuš Seiner; Oleg Heczko; Kornelius Nielsch; L. Schultz; S. Fähler
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Journal of Physics: Condensed Matter | 2012
Michaela Janovská; Petr Sedlák; Hanuš Seiner; Michal Landa; P. Marton; Petr Ondrejkovic; J. Hlinka
Mn
Journal of the Acoustical Society of America | 2012
Hanuš Seiner; Petr Sedlak; Lucie Bodnárová; Alena Kruisová; Michal Landa; Angel de Pablos; Manuel Belmonte
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Philosophical Magazine | 2017
Marek Vronka; Hanuš Seiner; Oleg Heczko
Ga
Journal of Materials Science | 2015
Martin Koller; Petr Sedlák; Hanuš Seiner; M. Ševčík; Michal Landa; Jitka Stráská; Miloš Janeček
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Applied Physics Letters | 2015
Eilon Faran; Hanuš Seiner; Michal Landa; Doron Shilo
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