Effect of temperature on mechanical properties of Al0.5CoCrCuFeNi wrought alloy

This work studies how temperature, from the ambient temperature to 900 degrees C, affects the mechanical properties of Al0.5CoCrCuFeNi alloys in different wrought states. The alloy displayed a good workability by rolling and an excellent combination of strength and elongation at ambient temperature in both the as-cold-rolled and the 900,C-annealed states as compared to those of 304 steel and Ti-6Al-4V. However, both as-rolled and as-annealed samples displayed intermediate embrittlement between 300 degrees C and 600 degrees C. The investigation of fractography, precipitate phases and the aging hardening response of the samples revealed the embrittlement mechanism: the BCC phase particles that precipitated from the supersaturated matrix and Cu-rich phases between 300 degrees C and 600 degrees C rendered the alloy of interest harder but more brittle. (C) 2009 Elsevier B.V. All rights reserved.