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Article

Transitory Ultrasonic Absorption in “Domain Engineered” Structures of 10 M Ni-Mn-Ga Martensite

1
Departament de Física, Universitat de les Illes Balears, cra Valldemossa, km. 7.5, 07122 Palma de Mallorca, Spain
2
Material Physics Laboratory, School of Engineering Science, LUT University, Yliopistonkatu 34, 53850 Lappeenranta, Finland
3
Shaped Crystals Physics Laboratory, Solid State Physics Division, Ioffe Institute, Polytechnicheskaya, 26, 194021 St. Petersburg, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Eric Hug
Metals 2021, 11(10), 1505; https://doi.org/10.3390/met11101505
Received: 31 August 2021 / Revised: 18 September 2021 / Accepted: 19 September 2021 / Published: 23 September 2021
(This article belongs to the Special Issue Recent Development in Magnetic Shape Memory Alloys)
In this work we create in 10 M Ni-Mn-Ga martensitic samples special martensitic variant structures consisting of only three twins separated by two a/c twin boundaries: Type I and Type II, with relatively low and very high mobility, respectively. The “domain engineered” structure thus created allows us to investigate the dynamics of a single highly mobile a/c twin boundary (TB). We show that temperature variations between 290 and 173 K in our samples induce an intense transitory internal friction at ultrasonic frequencies ca. 100 kHz, peaking around 215 K. A comparison is made of the data for the “domain engineered” sample with the behaviour of reference samples without a/c TB. Reference samples have two different orientations of a/b twins providing zero and maximum shear stresses in a/b twinning planes. We argue, first, that the transitory internal friction, registered at rather high ultrasonic frequencies, has magnetic origin. It is related with the rearrangement of magnetic domain structure due to the motion of a/c twin boundary induced by thermal stresses. This internal friction term can be coined “magnetic transitory internal friction”. Magnetic transitory internal friction is a new category, linking the classes of transitory and magnetomechanical internal friction. Second, the structure of a/b twins is strongly non-equilibrium over a broad temperature range. As a consequence, the Young’s modulus values of the samples with maximum shear stress in a/b twinning planes can take any value between ca. 15 and 35 GPa, depending on the prehistory of the sample. View Full-Text
Keywords: magnetic shape memory alloys; twinning; a/c twins; a/b twin laminate; domain engineering; internal friction; Young’s modulus magnetic shape memory alloys; twinning; a/c twins; a/b twin laminate; domain engineering; internal friction; Young’s modulus
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MDPI and ACS Style

Kustov, S.; Saren, A.; D’Agosto, B.; Sapozhnikov, K.; Nikolaev, V.; Ullakko, K. Transitory Ultrasonic Absorption in “Domain Engineered” Structures of 10 M Ni-Mn-Ga Martensite. Metals 2021, 11, 1505. https://doi.org/10.3390/met11101505

AMA Style

Kustov S, Saren A, D’Agosto B, Sapozhnikov K, Nikolaev V, Ullakko K. Transitory Ultrasonic Absorption in “Domain Engineered” Structures of 10 M Ni-Mn-Ga Martensite. Metals. 2021; 11(10):1505. https://doi.org/10.3390/met11101505

Chicago/Turabian Style

Kustov, Sergey, Andrey Saren, Bruno D’Agosto, Konstantin Sapozhnikov, Vladimir Nikolaev, and Kari Ullakko. 2021. "Transitory Ultrasonic Absorption in “Domain Engineered” Structures of 10 M Ni-Mn-Ga Martensite" Metals 11, no. 10: 1505. https://doi.org/10.3390/met11101505

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