Thermo-mechanical Characterization of an Aged Ni45.3Ti39.7Hf10Pd5 Shape Memory Alloy

Thermo-mechanical characterization of a Ni45.3Ti39.7Hf10Pd5 polycrystalline shape memory alloy after aging at 550 degrees C for 3 h was conducted. Thermal cycling under constant stress, superelasticity and loading till failure tests were employed to reveal the shape memory and material properties. Recoverable shape memory strain of 3.8% was achieved under compressive stress of 500 MPa. The sample showed almost perfect superelasticity above 70 degrees C with total recoverable strain of about 4%, but failed at 2340 MPa with compressive strain > 13% at 35 degrees C, and aging was not found to significantly affect its shape memory behavior because of the low volume fraction of precipitates.

Automated summary

Thermo-mechanical characterization was conducted on a Ni45.3Ti39.7Hf10Pd5 polycrystalline shape memory alloy after aging at 550 degrees C for 3 h. The alloy exhibited good shape memory and superelasticity properties, with aging having minimal impact on its shape memory behavior.