Abstract
The effects of copper addition on the compressive deformation behavior of B2 NiAl intermetallic alloys were investigated. Experimental NiAl–Cu alloys were vacuum melted and hot extruded at 1273 K at a 18:1 reduction ratio. Compressive flow behavior was analyzed over a temperature range from 298 to 1073 K. An increase in room temperature hardness by addition of 10 at.% Cu was observed in near stoichiometric NiAl–Cu alloys but hardnesses were lower in nickel-rich NiAl–Cu alloys than in binary NiAl. No considerable improvement in room temperature ductility was observed in NiAl containing 10 at.% Cu. Significant improvement in compressive ductility was observed in copper-micro-alloyed (less than 1%) near stoichiometric NiAl. Fracture strains were in the range 0.25–0.35 at room temperature and reached 0.8 at 473 K. At over 673 K, copper-microalloyed NiAl deformed in an almost perfectly plastic manner. The sources of improved ductility are discussed.
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