Preferred orientations in extruded nickel and iron aluminides

Preferred orientations in powder-extruded and cast and extruded binary NiAl (≈45 at. pct Al), FeAl (≈40 at. pct Al), and Ni3Al (≈24 at. pct Al) have been characterized by plotting inverse pole figures. The preferred orientation, [111], was observed along the extrusion direction in both powder-extruded and cast and extruded NiAl. Powder-extruded FeAl also exhibited [111] as the preferred orientation in the as-extruded condition. However, [110] was the preferred orientation in the cast and extruded FeAl and was replaced by a [211] orientation preference on annealing. Annealing did not change the preferred orientations in NiAl or powder-extruded FeAl. In contrast to the B2 NiAl and FeAl alloys, the Li2 Ni3Al alloy exhibited nearly random orientations with only a minor preference for a [111] orientation in the as-extruded condition.