Structure and Microstructure-based Mechanical and Thermodynamic Properties of a ribbon-shaped Co41Ni32Al27 Ferromagnetic Shape Memory Alloy.

This study presents a comprehensive investigation into the structural, microstructural, mechanical and thermodynamic properties of a melt-spun ribbon-shaped Co41Ni32Al27 ferromagnetic shape memory alloy (FSMA). Structural analysis through X-ray diffraction (XRD) and Rietveld refinement revealed the coexistence of β (B2, BCC) and γ (A1, FCC) phases, with the β phase being dominant (92.2%) and exhibiting a low atomic packing fraction, indicative of structural non-ideality. Microstructural features observed via FESEM and 3D surface profiling confirmed polycrystalline grain morphology with an average grain size of ~1.65 μm. Mechanical testing shows high ductility and dual elastic regions with a Young’s modulus up to 1956 MPa