کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1448987 988688 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Direct observation of AC field-induced twin-boundary dynamics in bulk NiMnGa
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Direct observation of AC field-induced twin-boundary dynamics in bulk NiMnGa
چکیده انگلیسی

The actuation performance and twin-boundary velocity in bulk NiMnGa magnetic shape memory single crystals at various frequencies are investigated. A dynamic actuation experimental setup with the ability to apply mechanical stress and a high-frequency alternating magnetic field is developed in tandem with time-resolved optical microscopy. Reversible twin-boundary motion activated in the frequency range up to 600 Hz is directly observed. The maximum field-induced strain increases with actuation frequency. Strain hysteresis curves measured at different frequencies show similar onset fields of strain. The data imply that twin-boundary velocity is not the limiting factor on actuation performance. The results provide significant information on twin-boundary performance during high-frequency actuation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 56, Issue 18, October 2008, Pages 5130–5137
نویسندگان
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