Martensitic Transition and Superelasticity of Ordered Heat Treatment Ni-Mn-Ga-Fe Microwires
نویسندگان
چکیده
The preparation of Ni-Mn-Ga and Ni-Mn-Ga-Fe master alloy ingots microwires was completed by high vacuum electric furnace melt melting drawing liquid forming equipment, the lattice dislocations defects formed inside during process were corrected stepwise ordered heat treatment. micro-structure phase structure characterized using a SEM field emission scanning electron microscopy an XRD diffractometer combined with EDS energy spectrum analyzer; martensitic transformation analyzed DSC differential calorimeter; superelasticity tested Q800 dynamic mechanical analyzer. results indicate that Fe doping can refine grain, transform from parent to single 7M martensite, reduce number variants, increase mobility twin grain boundary interface. MT transition temperature (MS) is substantially increased in martensite (MT) free electrons its lattice. During (SE) test, both displayed superior recover-ability SE curves, curves showed similar characteristics “linear superelasticity”, showing higher critical stress values complete experiment. satisfies Clausius-Clapeyron equation exhibits sensitivity than microwires.
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ژورنال
عنوان ژورنال: Metals
سال: 2022
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met12091546