Creep resistance of cast and aged Al-0.1Zr and Al-0.1Zr-0.1Ti (at.%) alloys at 300-400 °C

Cast and aged Al-0.1Zr and Al-0.1Zr-0.1Ti (at.%) alloys, upon compressive creep deformation at 300-400 degrees C, exhibit threshold stresses attributable to climb-controlled bypass of coherent Al(3)Zr and Al(3)(Zri(1-x)Ti(x)) precipitates. Al-0.1Zr-0.1Ti exhibits a smaller threshold stress than Al-0.1Zr, which is attributed principally to a reduced lattice parameter mismatch between the Al(3)(Zr(1-x)Ti(x)) precipitates and the matrix. The present alloys are less creep resistant than Al-Sc and Al-Sc-Zr/Ti alloys with similar precipitate radii and volume fractions. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.