کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1583174 1514878 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Martensitic transformation in Ni–Fe–Ga alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Martensitic transformation in Ni–Fe–Ga alloys
چکیده انگلیسی

Fe-based ferromagnetic shape memory alloys have attractive mechanical properties as compared with the classical Ni2MnGa ones, because of their enhanced ductility. This opens new possibilities regarding technical applications as magnetic sensors or actuators. In this work, we present a multiple technique study of the martensitic transformation in alloys with nominal composition Ni55−xFe19+xGa26 (x = 0, 1, and 2) transforming close to room temperature. Magnetic characterisations, performed in a SQUID magnetometer and by AC methods show the Curie temperature (TC ≈ 300 K) increasing with Fe content while the martensitic temperature (TM ≈ 240 K) decreases, in agreement with DSC and resistivity measurements. In addition, several Curie temperatures are found by the magnetic measurements, indicating the coexistence of different phases in the alloy. Neutron diffraction study suggests the L21-ordered cubic phase for austenite and 14 M structure for the martensitic phase. The transformation is observed from the temperature evolution of the diffraction peaks.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 478, Issues 1–2, 15 April 2008, Pages 125–129
نویسندگان
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