Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 46A, Issue 6, Pages 2614-2624Publisher
SPRINGER
DOI: 10.1007/s11661-015-2876-6
Keywords
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- Japan Science and Technology Agency (JST)
- Light Metals Educational Foundation of Japan
- Ministry of Education, Culture, Sports, Science and Technology of Japan [22102004]
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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).
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