Abstract
Two Al-Sc alloys were examined to establish the relative influence of grain boundary segregation and precipitation of Sc on the microstructural evolution during equal channel angular pressing (ECAP). Due to the ultra-low Sc content in the low-Sc alloy additional measures were taken to ensure a homogenous distribution of the Sc. After casting, this alloy was swaged and homogenised. One ECAP pass and a solution treatment were undertaken before carrying out 10 ECAP passes. For the analysis with transmission electron microscopy (TEM) and transmission Kikuchi diffraction (TKD), electron transparent thin foils were cut parallel to the ECAP extrusion axis and then thinned by using a Struers TenuPol5, at a voltage of 12 V in 30% nitric acid and 70% methanol at -30°C. To assess the grain size stability, the samples were heated to 550°C. Analysis of grain orientation maps obtained by TKD revealed that the grain size, defined by the HAGBs, is three times larger than expected. The distribution of Al3Sc precipitates after heat treatment indicated that recovery occurs.
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