Ta 1 (at %) SMAs are fabricated. The microstructure, mechanical property, and phase transformation of NiTiFeNb and NiTiFeTa SMAs are further investigated. Ti 2 Ni and β-Nb phases can be observed in NiTiFeNb SMA, whereas Ti 2 Ni and Ni 3 Ti phases can be captured in NiTiFeTa SMA. As compared to NiTiFe SMA, quaternary NiTiFeNb and NiTiFeTa SMAs possess the higher strength, since solution strengthening plays a considerable role. NiTiFeNb and NiTiFeTa SMAs exhibit a one-step transformation from B2 austenite to B19' martensite during cooling, but they experience a two-step transformation of B19'-R-B2 during heating.
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