Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 321, Issue 7, Pages 763-768Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2008.11.105
Keywords
Martensitic phase transformation; Heusler alloys; Magnetic shape memory alloys; Melt spun ribbons
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We outline the microstructural, martensitic transformation and magnetic properties of Heusler alloys with starting compositions Ni50Mn37Sn13, Ni50Mn36In14, and Mn50Ni40In10, produced by melt spinning. The ribbons were obtained in argon environment at a high wheel linear speed of 48 m s(-1) (typical dimensions: 1.2-2.0 mm in width, 4-12 mm in length, and 7-12 mm in thickness). EDS microanalysis showed that the resulting average elemental chemical composition is slightly shifted with respect to the starting one. Ribbons are fully crystalline and tend to show a highly ordered columnar-like microstructure with grains running through the entire ribbon thickness; the larger dimension of the grains is perpendicular to the ribbon plane. As-spun alloys were single-phase with ferromagnetic bcc L2(1) austenite as high-temperature parent phase. At low temperatures austenite transforms into a structurally modulated martensite with a lattice symmetry that depends on the system (7 M orthorhombic for Ni50Mn37Sn13, 10 M monoclinic for Ni50Mn36In14, and 14 M monoclinic for Mn50Ni40In10). Magnetization isotherms measured in the temperature interval where martensite thermally transforms into austenite confirmed the occurrence of field-induced reverse martensitic transition in the alloys studied. (C) 2008 Elsevier B.V. All rights reserved.
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