Abstract
The ferritic FeCrAl alloy INCOLOY MA956 strengthened by oxide dispersoids is considered for applications at temperatures around 1000 °C. The oxide particles act as obstacles for moving dislocations. The results of tensile and compression tests showed that there are two different mechanisms of strengthening depending on the deformation temperature of the alloy. The microstructural investigations revealed the different dislocation substructure, especially dislocation-dispersoid interaction in the specimens deformed in low and high temperatures. At temperatures in the range 20–400 °C, dislocation loops around the dispersoid particles were observed, indicating an Orowan type of strengthening effect. During high temperature tensile and compression deformation, the shape of dislocations pinned at the departure side of particles indicated an attractive dislocation-particle interaction as described by the Rosler-Arzt model of dispersion strengthening.
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