Evolution of macroscopic elastic moduli of martensitic polycrystalline NiTi and NiTiCu shape memory alloys with pseudoplastic straining

0468560 - ÚT 2017 RIV GB eng J - Článek v odborném periodiku
Thomasová, M. - Seiner, Hanuš - Sedlák, Petr - Frost, Miroslav - Ševčík, Martin - Szurman, I. - Kocich, R. - Drahokoupil, Jan - Šittner, Petr - Landa, Michal
Evolution of macroscopic elastic moduli of martensitic polycrystalline NiTi and NiTiCu shape memory alloys with pseudoplastic straining.
Acta Materialia. Roč. 123, January (2017), s. 146-156. ISSN 1359-6454. E-ISSN 1873-2453
Grant CEP: GA ČR(CZ) GP14-28306P; GA ČR GA14-15264S
Institucionální podpora: RVO:61388998 ; RVO:68378271
Klíčová slova: shape memory alloys * polycrystals * elastic behavior
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.); Condensed matter physics (including formerly solid state physics, supercond.) (FZU-D)
Impakt faktor: 6.036, rok: 2017

Elastic constants of polycrystalline NiTi and NiTiCu shape memory alloys in the martensite phase were determined by resonant ultrasound spectroscopy; the evolution of these constants was studied with subsequent applications of compressive loads inducing reorientation of martensitic variants. While the initial thermally -induced martensite exhibited only weak elastic anisotropy resulting from the underlying crystallographic texture of the parent phase, the materials with oriented martensitic microstructures exhibited strong elastic anisotropy with Young's moduli in different directions differing by several tens of GPa-s. A qualitative difference in behaviors was observed between the monoclinic B19' martensite in the NiTi alloy and the orthorhombic B19 martensite in the NiTiCu alloy.
Trvalý link: http://hdl.handle.net/11104/0266995