Investigation of the Mechanical Properties of Oxide Scales on Nickel and TiAl

摘要: In this paper, a modified four-point bending test is described, which allows quantitative determination of the mechanical properties oxide scales on metallic substrates at temperatures from ambient to 900°C. Scale failure detected by acoustic emission. By combining deformation data with physical defect-structure values for scales, fracture toughnesses have been evaluated cases through-scale cracking and delamination/spalling. The was applied NiO pure nickel an intermetallic TiAl alloy room temperature 900°C, respectively. fracture-toughness determined in these investigations correspond order magnitude expected rare literature data. itself can also be variety brittle coatings more-or-less ductile substrates.