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The microstructure, magnetic and mechanical properties of the annealed at 1430 K Ni50Mn25Ga20Gd5 (at.%) magnetic shape memory alloy were studied. The Ni50Mn25Ga20Gd5 ingot was prepared in a bulk form by arcmelting method. Scanning electron microscopy supported by atomic force microscopy investigations confirmed a dual-phase microstructure of the studied alloy characterized by Gd-poor and Gd-rich phases. Temperature dependence of magnetic magnetization M(T ) measured at high (μ0H = 2 T) and low (μ0H = 0.25 T) value of external magnetic fields revealed that the fabricated material undergoes reversible martensitic transition close to the room temperature. The Curie temperature for the investigated material calculated from the M(T ) curve measured in zero-field cooled mode is 377 K. Mechanical properties of the Ni50Mn25Ga20Gd5 alloy investigated by the means of a series of nanoindentation tests allowed to separate hardness for the Gd-poor (435 HV) and Gd-rich (562 HV) phase.

Structural, Magnetic and Mechanical Properties of Dual-Phase Ni50Mn25Ga20Gd5 Magnetic Shape Memory Alloy

Structural, Magnetic and Mechanical Properties of Dual-Phase Ni₅₀Mn₂₅Ga₂₀Gd₅ Magnetic Shape Memory Alloy