Age Hardening in Ultrafine-Grained Al-2 Pct Fe Alloy Processed by High-Pressure Torsion

A cast Al-2 wt pct Fe alloy was processed by high-pressure torsion (HPT) at room temperature and then subjected to artificial aging at temperatures of 373 K and 473 K (100 A degrees C and 200 A degrees C). The aging behavior was studied by Vickers microhardness measurements and by microstructural analyses using transmission electron microscopy and X-ray diffraction. The initial intermetallic structures, composed of a mixture of Al + Al6Fe and Al + Al3Fe eutectics phases, were partially dissolved in the matrix up to a supersaturation of 1 wt pct Fe. The microstructure was refined by HPT to an ultrafine-grained level with a minimum grain size of 120 nm in the matrix and a dispersion of particles less than 400 nm. Age hardening was achieved within 0.25 hours at 473 K (200 A degrees C), to a maximum UTS of 700 MPa as a result of nano-sized precipitation within the ultrafine grains. The uniform elongation exceeded 12 pct even at intermediate levels of imposed strain by HPT, while it decreased to 6 pct with the subsequent aging treatment. The thermal stability of the ultrafine-grained structure was verified to exceed 16 days at 373 K (100 A degrees C) and 12 hours at 473 K (200 A degrees C).