Elevated temperature deformation behaviour of multi-phase Ni-20 at % Al-30 at % Fe and its constituent phases

Effect of Process on Microstructure and Elevated Temperature Mechanical Behavior of Multi-Phase NiAl-Fe(Nb) Alloy

“…NiAl-based intermetallics alloys are potential materials for high temperature structural applications, however, limited fracture toughness at room temperature and lack of creep strength at high temperature impede their use. An attractive approach to improve the ambinent ductility and toughness of NiAl is that the NiAl is alloyed by large amount of Fe element [1][2][3][4][5][6][7][8][9]. The extruded single phase Ni-30Al-20Fe alloy (β phase) exhibited 6% tensile ductility and 800MPa yield strength at room temperature [1,2].…”

“…The room temperature elongation of NiAl alloy can further be enhanced by embedding the toughed secondary phase(γ/γ′), which is γ-Ni phase containing γ′-Ni 3 Al phase. The typical alloy is Ni-20Al-30Fe two phase alloy(β and γ/γ′), which possesses 20% tensile ductility at room temperature [3,4]. However, the high temperature strength of Ni-20A-30Fe is rather poor.…”

A study of microstructure and ductility of directionally solidified Ni50Al20Fe30

“…Ductile phase reinforcement is a well-established method to improve ductility and toughness of brittle materials. The ductility of Ni 50 Al 20 Fe 30 was further studied, 6,7 and directional solidification method was used to further improve its ductility. % Fe to introduce ductile g phase (fcc structure) as a reinforcement to the brittle b phase (bcc base-ordered B2 structure) was studied in rapidly solidified material.…”