Compressive and tensile creep in Fe40Al0.1Zr0.4B at 1100 K

Abstract

The 1100 K compressive and tensile creep behavior of the B2 crystal structure aluminide Fe40Al0.1Zr0.4B (atom%) containing Fe 6Al 6Zr precipitates has been investigated. While the Zr/B alloying additions yielded considerable improvements in strength, the quaternary alloy was still relatively weak: ≈ 30 MPa produced 1% strain in 100 h. The creep rates in tension exceeded those measured in compression and this difference could be ascribed to the formation of creep cavities in tension but not in compression. By comparison to existing deformation models, it is believed that the increased tensile creep rates are explicable through the power-law-accomodated constrained-diffusion cavity-growth model.