Mechanical properties of Ag/1.2 at.% Mg were measured at room temperature in air and at 900°C in Ar or O2. Exposure to O2 at 900°C induced formation of MgO precipitates, which hardened the material and decreased its ductility substantially at both temperatures. At room temperature, oxidation increased the yield strength by a factor of ∼ 8 and the stiffness by ∼ 16%. At 900°C and strain rates of 3 x 10-6 to 10-4 s-1, deformation was strongly dependent on atmosphere: in Ar, the alloy deformed by dislocation motion and underwent dynamic recrystallization; in O2, the yield stress increased by a factor of ∼ 10, but the specimens fractured after limited plasticity.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering