Morphology of silicon grain boundaries in Sr-modified AI-Si eutectic alloys by HREM

Crystallographic changes m the ~'3(110)/{111}, ~f3(110)/{112} and .~9(110)/{112} boundaries reduced by the presence of strontmm m the slhcon phase of St-modified A1-SI alloys have been studied by high-resolution electron microscopy The 2'3 boundaries possessing {111} and {112} planes m the pure silicon phase often exhibit asymmetric morphologies m the Sr-modlfled phase Interaction of various 23(110)/{111} boundaries results m both 23(110)/{112} and 2'9(110)/{112} boundaries The resulting ~9 boundaries also show asymmetrical mchnatlon