Abstract
The Al-Mg single crystal solution heat treated and slowly cooled has a plasticity at temperatures above 360°C. An yield drop is once observed on the stress-strain curve and deformation progresses under a constant flow stress at 360°C to 390°C. The stress gradually increases with strain up to a constant stress and a steady state of creep proceeds at temperatures above 400°C. The yield point phenomena are discussed in terms of the dislocation multiplication process. The creep stress increases with an increase of Al content. Preservation of covalent bond and increase of electron density contribute to the strength in Al-rich side, and decrease of covalent bonding reduces the creep stress in Mg-rich side. The polycrystals plastically deforms at temperatures above 400°C and have a lower flow stress and less elongation than the single crystals.
