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1 Archives of Metallurgy and Materials

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Precise Orientation Control of Single Crystalline NiMnGa-Based Alloys by in-situ EBSD Analysis

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Szewczyk A. , Faryna M. , Wójcik A. , Maziarz W. , Chulist R.

2023

tom Vol. 68, iss. 3

1171--1175

The article presents a precise method for the orientation process of NiMnGa-based single crystals. For this method, a scanning electron microscope equipped with an EBSD camera and a heating stage allowing temperatures exceeding 873 K was used. The orientation process was carried out in both the high-temperature austenite phase and in the room-temperature martensite phase. The facilities allowed for determining the orientation of a single grain of austenite at elevated temperatures as well as the orientation of particular martensitic variants at room temperature. A practically perfect cubic orientation was obtained in the austenitic case with a deviation of about 1° while the samples oriented in the martensitic phase deviated from the desired orientation by 4.5-5.2°. Additionally, the training process of single crystals was carried out in order to show the influence of the orientation process on twinning stress.