Mechanical behavior of ultrafine-grained cryomilled Al 5083 at elevated temperature

The mechanical behavior of cryomilled and consolidated At 5083 with a duplex ultrafine-grained microstructure is described for compression testing at different temperatures and strain rates. The relationship among flow stress, strain rate, and testing temperature provides an initial hotworking guide for fine-grained cryomilled aluminum alloys. The ultrafine-grained material exhibits similar deformation characteristics, such as strain-rate sensitivity, which would be expected in a conventional aluminum alloy. These findings are discussed in the context of recent empirical and theoretical models for the deformation of materials with grain sizes between 100 and 1000 nm.