l) The fracture is intergranular in all cases, whether precipitates are
present at the grain boundaries or not. (2) For the material with clean grain boundries,
occurrence of deformation on grain boundary’s facets is not observed, though traces of slip
lines in the grain interior are observed(Fig.7d). (3) When the solid solution treatment
temperature is less than 975oC, heavy deformation is observed at the interfaces of grains where
many deformation dimples can be seen (Fig.9a and b). (4) Although massive precipitates are
present at the grain boundaries in samples which were partially solid solution treated at and
above 9750C temperature, however, no indication of grain boundary deformation is evident.
l) The fracture is intergranular in all cases, whether precipitates arepresent at the grain boundaries or not. (2) For the material with clean grain boundries,occurrence of deformation on grain boundary’s facets is not observed, though traces of sliplines in the grain interior are observed(Fig.7d). (3) When the solid solution treatmenttemperature is less than 975oC, heavy deformation is observed at the interfaces of grains wheremany deformation dimples can be seen (Fig.9a and b). (4) Although massive precipitates arepresent at the grain boundaries in samples which were partially solid solution treated at andabove 9750C temperature, however, no indication of grain boundary deformation is evident.
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