Original title: Ladění podmínek růstu monokrystalů Ni50Mn28.5Ga21.5, slitiny s magnetickou tvarovou pamětí
Translated title: Tuning the crystal growth condition of Ni50Mn28.5Ga21.5 magnetic shape memory alloy
Authors: Maruška, Jakub ; Uhlířová, Klára (advisor) ; Čermák, Petr (referee)
Document type: Bachelor's theses
Year: 2019
Language: eng
Abstract: [eng] [cze]
Ni2MnGa as representative of magnetic memory shape alloys is gaining popularity in recent years as promising smart material. Most interesting phenomena are observable in single crystals near the martensitic transition temperatures. The strong dependence of its properties on composition is very important for future applications. In order to study its properties, good single crystal with room temperature martensitic transition is desirable. This thesis is focused on tuning growth of crystal in optical floating zone furnace and measuring transition temperatures. To that end multiple specimen with different composition were prepared and their composition and crystalline structure studied by EDS and Laue diffraction. Transitions were studied by magnetisation, calorimetry and dilatometry measurements. Ni2MnGa, reprezentant zliatin s magnetickou tvarovou pamäťou, v posledných rokoch získava popularitu ako sľubný smart materiál. Jeho najzaujímavejšie vlastnosti sú pozorovateľné na monokryštáloch v okolí martenzitickej transformácie. Silná závislosť fyzikálnych vlastností na zložení je velmi dôležitá pre budúce aplikácie. Pre štúdium jeho vlastností je potrebný dobrý monokryštál s martenzitickou transformáciou pri izbovej teplote. Táto práca sa zameriava na ladenie rastu kryštálu v optickej zonálnej peci a meranie teplôt transformácií. Pre tento účel bolo vyrobených niekoľko vzoriek s rôznym zložením a ich zloženie a kryštalická štruktúra boli skúmané pomocou EDS a Laueho diffrakcie. Prechody boli študované pomocou magnetizácie, kalorimetrie a dilatometrie.
Keywords: Heusler alloys; Martensitic transition; MSM; Heuslerove zliatiny; Martenzitická transformácia; MSM

Institution: Charles University Faculties (theses) (web)
Document availability information: Available in the Charles University Digital Repository.
Original record: http://hdl.handle.net/20.500.11956/108179

Permalink: http://www.nusl.cz/ntk/nusl-398282


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Universities and colleges > Public universities > Charles University > Charles University Faculties (theses)
Academic theses (ETDs) > Bachelor's theses