Abstract
• An unusual precipitation phenomenon is observed in Fe-alloyed 60NiTi. • The unknown Ni-rich nano-size phase is formed due to the addition of Fe. • Fe alloying considerably increases the hardness of 60NiTi. In this work, the microstructure and hardness of Fe-alloyed 60NiTi alloys, (Ni 55 Ti 45 ) 100-x Fe x (x = 0.5, 1, 3, 5 at. %), were studied. The addition of Fe leads to an unusual precipitation phenomenon that significantly influences the microstructure of the studied alloys. In the Fe-alloyed samples, an unknown secondary phase ( X phase) precipitates with bcc crystal structure and nano-scale size. The X phase that evolves as thin plates in a densely dispersed manner in the microstructure brings about a hardening effect similar to Ni 4 Ti 3 . The hardness of 60NiTi is considerably increased owing to the microstructural evolutions resulting from the addition of Fe, with a maximum value of 717 HV at 5 at.% Fe content in the alloy.
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