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Optimization of physical and mechanical properties of ultrafine-grained Al-Mg-Zr alloy for electrical purposes
Russian version
Orlova T. S. 1, Sadykov D. I. 1, Kirilenko D. A. 1, Lihachev A. I. . 1, Levin A. A.1
1Ioffe Institute, St. Petersburg, Russia
Email: orlova.t@mail.ioffe.ru
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For the ultrafine-grained (UFG) Al-0.95Mg-0.32Zr (wt.%), alloy structured by high-pressure torsion (HPT), a unique combination of strength (390 MPa), ductility (~10 %) and electrical conductivity (~49 % IACS - International Annealed Copper Standard) was achieved due to additional deformation-heat treatment (DHT), consisting of annealing at an elevated temperature of 230 oC for 1 h and a small additional deformation by HPT. The evolution of microstructure at both stages of DHT was studied. The analysis of the microstructure-property relationship showed that the achieved ductility is provided by the introduction of an additional dislocation density into the anneal-relaxed grain boundary (GB) structure and near-boundary regions as a result of DHT, as well as the formation of a significant fraction (~20 %) of larger grains with a size of ≥900 nm in the UFG structure. The retention of strength after DHT at a level of ~75 % of the strength in the initial UFG state can be explained by the retention of a small average grain size (510 nm) and the formation of new Mg segregations at GBs. Keywords: aluminum alloys, ultrafine-grained structure, strength, ductility, grain boundaries, segregation, dislocations.
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