Abstract
The oxidation of NiAl, NiAl-20at.%Fe and NiAl-30at.%Fe at 1000-1100 °C in air has been studied. Pure NiAl shows excellent oxidation resistance due to the formation of an Al2O3 layer. NiAl-20Fe also shows good oxidation resistance due to the formation of an Al2O3 scale on a <FONT FACE="Symbol">b</font>-phase substrate. Moreover, some nodules consisting of mixed oxides of Fe and Ni grow over the ductile <FONT FACE="Symbol">g</font>-phase surface incorporated to the <FONT FACE="Symbol">b</font>-phase substrate. NiAl-30Fe alloy undergoes a much faster oxidation due to the formation of a non-protective Fe and Ni-rich scale, which is extremely susceptible to spallation. The addition of Fe to NiAl is detrimental to its oxidation resistance.
Highlights
NiAl is an intermetallic compound with β structure, which is considered as a candidate for high temperature structural material due to its high melting point, low density, good heat conductivity and excellent oxidation resistance[1,2]
The materials selected for the present study are pure NiAl, NiAl-20at.%Fe and NiAl-30at.%Fe alloys
Nodules rich in Fe and Ni oxides formed on the alloy surface, which mainly developed over the γ phase incorporated to the β-phase substrate(Fig. 4b)
Summary
NiAl is an intermetallic compound with β structure, which is considered as a candidate for high temperature structural material due to its high melting point, low density, good heat conductivity and excellent oxidation resistance[1,2]. It has low room-temperature ductility and poor high temperature creep resistance. It has been shown that the addition of Fe to NiAl can improve its high-temperature creep resistance[3] and room temperature ductility[4]. The present study examines the high temperature oxidation in air of two Fe-containing NiAl alloys i.e. NiAl-20at.%Fe and NiAl-30at%Fe
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