TEM Studies on the Microstructure in Ferromagnetic Shape Memory Alloys

Y. Murakami; T. Yano; Daisuke Shindo

doi:10.4028/www.scientific.net/AMR.47-50.515

Paper Titles

Structural Transition of Stabilized Martensite in CuZnAl Alloy
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A Comparative Study of the Hydrostatic Performances of 1-3 Piezoelectric Composites with a Porous Matrix
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Friction Characteristic of Sliding Direction and Angle of Micro-Grooved Crosshatch Patterns under Lubricated Contact
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Vascularized Multi-Functional Materials and Structures
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TEM Studies on the Microstructure in Ferromagnetic Shape Memory Alloys
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Experimental Observation on Domain Front Morphology in NiTi Microtube during Tensile Unloading
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Fabrication and Simulation of a Ni–Al₂O₃ Crack-Free Joining for Multiple Metal-Ceramic Composites Using a New Functionally Graded Material (FGM) Method
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The Application of Thermosensitive Magnetic Nanoparticles in Drug Delivery
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Light-Induced Functional VO₂ Films
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 47-50TEM Studies on the Microstructure in Ferromagnetic...

TEM Studies on the Microstructure in Ferromagnetic Shape Memory Alloys

Abstract:

The magnetic domain structures of the cubic parent phase (high-temperature phase) in ferromagnetic shape memory alloys (SMAs) have been studied by electron holography. In a Ni51Fe22Ga17 alloy, the magnetic flux distribution in the parent phase changes dramatically before the onset of martensitic transformation. In contrast, a Ni45Co5Mn36.7In13.3 alloy—a recently developed ferromagnetic SMA—does not show appreciable changes in the magnetic domain structure upon cooling. The anomaly observed in the Ni51Fe22Ga17 alloy appears to be due to lattice distortions, which become more pronounced as the temperature approaches the martensitic transformation start temperature, Ms.