Abstract
This work focuses on the effects of Ta addition on the microstructure, martensitic transformation, mechanical properties and shape memory effect (SME) of (Ni52.2Ti47.8)100-xTax alloys with a fixed Ni/Ti ratio of 1.09. The solubility limit of Ta in (Ni52.2Ti47.8)100-xTax alloys is determined to be within 3–4 at%. Excessive Ta leads to the formation of secondary phases, the majority of which are (Ta,Ti)2Ni phases. The addition of Ta can effectively refine the grains of NiTiTa alloys. Transformation temperatures are elevated remarkably until Ta content reaches 4 at% and then increase slightly at higher Ta contents, which is due to the change of valence electron concentration. The thermal hysteresis is widened by adding Ta and applying a constraint stress. The addition of Ta remarkably improves the ductility while decreases the hardness. By modifying the content of Ta, a considerable SME is achieved with the maximum recovery strain up to 7.0 %.
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