| It has been found that cryorolling of the preliminary quenched commercial rod of D16 aluminum alloy at a temperature of liquid nitrogen up to strains of 3.5 results in the well-developed cellular substructure with separate nanograins inside coarse fibers. Further aging at ambient and elevated temperature leads to the alloy disperse strengthening accompanied by recovery and recrystallization of the deformation structure. After natural aging the cryorolled alloy demonstrates much higher strength (YS = 635 MPa) and hardness (~180 Hv) but less plasticity (El < 3%) than in conventionally T6 treated material. Meanwhile, the artificially aged alloy exhibits the unique balance of strength (YS = 570 MPa) and plasticity (El > 7%) reasoned by its multilevel nanostructuring, owing to the formation of mixed nanoprecipitation- and nano(sub)grain-strengthened structure. |
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