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2008
Conference Paper
Titel
Cast and rolling textures of NiMnGa alloys
Abstract
The texture of two polycrystalline NiMnGa magnetic shape memory alloys fabricated by directional solidification and hot rolling has been measured with high-energy synchrotron radiation and neutron diffraction. At room temperature the alloys used are composed of a 7M (modulated) and NM (non-modulated) martensitic structure. The texture of the directionally solidified alloy for all phases is a pronounced fibre texture with <100> preferentially aligned along the growth direction. In the directionally solidified case a variant selection took place with (001) dominating. The texture of the hot rolled alloy shows a weak recrystallization texture with (111) and <112> aligned parallel to the rolling plane and rolling direction, respectively. The texture results are discussed with respect to material, processing and phase transformations including variant selection.
Language
English
Tags
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Formgedächtnislegierung
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Nickellegierung
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chemische Zusammensetzung
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polykristalliner Stoff
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gerichtete Erstarrung
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Warmwalzen
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Stängelkristallgefüge
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Verfahrensparameter
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martensitische Umwandlung
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Umwandlungstemperatur
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Martensit
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orthorhombische Kristallstruktur
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tetragonale Kristallstruktur
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Schmelztextur
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Walztextur
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Rekristallisationstextur
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Texturanalyse
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Röntgenbeugung
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Synchrotronstrahlung
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Neutronenbeugung
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Polfigur