Formation and Stacking of Octahedral Silicon Growth Unit
After modified by Sr,the primary silicon of Al-26%Si alloy likes fishbone with different length.The primary silicon was extracted from Al-26%Si alloy by chemical extraction.The results show that primary silicon is the strip aggregation stacked by octahedral silicon with different structure and dimension.During primary silicon growth,the octahedral silicon as growth units is vertex-linked and connected with the structure unit on the crystal surface along the direction of stable combination.