The influence of Sc on thermal stability of a nanocrystalline Al-Mg alloy processed by cryogenic ball milling
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- The influence of Sc on thermal stability of a nanocrystalline Al-Mg alloy processed by cryogenic ball milling
- Zhou, F; Lee, Zonghoon; Lavernia, EJ; Nutt, SR
- STRAIN RATE SUPERPLASTICITY; SEVERE PLASTIC-DEFORMATION; MECHANICAL ATTRITION; GRAIN-GROWTH; MICROSTRUCTURAL EVOLUTION; DUCTILITY; BEHAVIOR; POWDERS; AL3SC; SIZE
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- METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v.36A, no.6, pp.1587 - 1594
- The microstructural evolution during annealing of a cryogenically ball-milled Al-7.5Mg-0.3Sc (in wt pct) was examined using differential scanning calorimetry and transmission electron microscopy (TEM). The as-milled alloy was a supersaturated fcc solid solution with an average grain size of &SIM; 25 nm and heterogeneous grain morphologies and size distributions. Calorimetric measurements at a constant heating rate of 32 K/min indicated two exothermic events in association with recovery from 100 &DEG; C to 240 &DEG; C and recrystallization from 300 &DEG; C to 450 &DEG; C. Prior to recrystallization, the precipitation of Al3SC may occur at low annealing temperatures producing a nonuniform dispersion of approximately spherical particles with diameters of 4 to 5 nm. Recrystallization gave rise to heterogeneous microstructures with bimodal grain size distributions, which may result from the heterogeneity of microstructure in the as-milled state. The heterogeneous microstructures of the recrystallized Al-Mg-Sc alloy were similar to those observed in the recrystallized Sc-free Al-Mg alloy.
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