Mechnical properties of NiAl–Cr alloys in relation to microstructure and atomic defects

Abstract The quasi-binary eutectic NiAl–Cr of the ternary Ni–Al–Cr system is composed of B2 type NiAl(Cr) solid solutions and the b.c.c. transition metal chromium as second phase. This constitution enables a systematic alloy design in dependence on the Cr content for improving elastic stiffness, high temperature strength, creep resistance, and fracture toughness of intermetallic NiAl. Elasticity and mechanical properties of NiAl(Cr) reinforced by nano-sized Cr particles or quasi-continuous Cr fibres of several microns in diameter are presented and discussed in respect to single phase NiAl and literature data. The microstructural characterization and discussion of mechanical properties of NiAl–Cr alloys are supplemented by atom probe field ion microscopy analysis (APFIM). APFIM was used to determine the atomic defect structures, the Cr site preference and reveals Cr segregations at antiphase boundaries.

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