Abstract
Ni-Al based alloys are considered to be attractive high temperature shape memory materials. Among proposed alloying in the present work, there are Fe, Zr and Co elements. High temperature of martensitic transformation (Ms > 150 °C) with full shape recovery is achieved due to Zr alloying. Complex doping of Zr and Fe/Co also makes possible to produce perspective high temperature shape memory alloys.
Highlights
Binary Ni-Al alloys undergo thermoelastic martensitic transformation (MT) [1, 2, 3] in temperature range of 09000 C depending on nickel content
In the present work the Ni-Al-Zr, Ni-Al-(Zr+Co), NiAl-Fe, and Ni-Al-(Fe+Zr) alloys were studied with the Ni65Al and Ni60Fe3Al base compositions in order to investigate the influence of Zr, Fe and complex doping on the martensitic parameters
Analyze of tendencies in MT temperatures for binary Ni-Al alloys [3, 7, 14] and our own results show that the increase of Ni content causes Ms to rise, while the addition of third element may act in two different directions
Summary
Binary Ni-Al alloys undergo thermoelastic martensitic transformation (MT) [1, 2, 3] in temperature range of 09000 C depending on nickel content. According to [15] Zr doping leads to the formation of new phase and zirconia was observed to segregate on dislocations This result supports the suggestion that the substantial increase in ductile-tobrittle transition temperature in Ni-Al-Zr alloys is caused by the pinning of dislocations by zirconium. In the present work the Ni-Al-Zr, Ni-Al-(Zr+Co), NiAl-Fe, and Ni-Al-(Fe+Zr) alloys were studied with the Ni65Al and Ni60Fe3Al base compositions in order to investigate the influence of Zr, Fe and complex doping on the martensitic parameters.
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