Abstract
The paper presents results of measurements concerning basic thermomechanical properties of sintered high purity chromium and two sintered Cr–Fe alloys, i.e. Cr 5Fe 1Y 2O 3 and Cr 44Fe 5Al 0.3Ti 0.5Y 2O 3 investigated in the temperature range from room temperature to 600°C. The materials were characterized by tensile testing, measurements of thermal diffusivity, metallographic characterization and fractographic studies. The results are discussed with regard to transient thermal loading faced by first wall structures. In order to address the critical issue of brittleness, fracture mechanics tests have been performed which give indications on the ductile to brittle transition temperature. Results for the temperature dependence of the fracture toughness of high purity chromium are presented. Fracture mechanisms in the above mentioned temperature range are discussed on the basis of microstructural analyses by optical and scanning electron microscopy.
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