The properties of two-phase Ni–Al–Fe shape memory alloys in the virgin and shape-memory-cycled states

Phase equilibria in the Ni–Fe–Ga alloy system

“…In 1991, Ishida et al [13] reported that the ductility of polycrystalline Ni-Al-based ␤ (B2) alloys is drastically improved by the introduction of the ␥ (A1) phase of Ni solid solution on the grain boundaries of the ␤ phase. Actually, this kind of microstructural control has been attempted in some shape memory alloys, such as Ni-Fe-Al [14,15], Ni-Co-Al [16,17], Ni-Co-Ga [6,18,19] and Ni-Fe-Ga [8,20] alloys, and improvement of ductility has been achieved. For such micrstructural control in two-phase alloys, phase equilibrium information is very important.…”

Phase equilibria in the Ni–Co–Ga alloy system

“…In 1991, we reported that the ductility of polycrystalline Ni-Al-based ␤ (B2) alloys is drastically improved by the introduction of the ␣ (A1) phase of Ni solid solution on the grain boundaries of the ␤ phase [13]. Recently, this type of microstructural control has been attempted with some shape memory alloys, such as Ni-Fe-Al [14,15], Ni-Co-Al [16,17], Co-Ni-Ga [6,18,19] and Ni-Fe-Ga [8,20] alloys, and ductility improvement has been achieved in * Corresponding author. Tel.…”

Phase equilibria and composition dependence of martensitic transformation in Ni–Mn–Ga ternary system

“…Recent research has shown that the ductility of polycrystalline NieMneGa alloys can be effectively improved by introducing the ductile g phase through alloying [7,10e14]. Similar investigations have already been achieved in some other shape memory alloys (SMAs), such as NieFeeAl [15,16], NieCoeAl [17,18], NieCoeGa [19e21] and NieFeeGa [22], etc. However, these "modified" two-phase NieMneGa alloys are obtained mainly by trial-and-error method due to the scarcity of phase equilibria information in the NieMneGa ternary system.…”