Diffusionless (chemically partitionless) crystallization and subsequent decomposition of supersaturated solid solutions in Sn-Bi eutectic alloy.

ABSTRACT: Results of a study on microstructural evolution of eutectic Sn-57 wt.% Bi processed with cooling rates of 10-2, 1 K s-1 and approximately 105 K s-1 are presented. In order to distinguish different mechanisms of microstructure formation, a comparison with microstructures of different hypoeutectic alloys with compositions down to below the maximum solubility of Bi in Sn-Bi is undertaken. It is found that at the cooling rates of 10-2 and 1 K s-1, coupled eutectic growth occurs, leading to lamellar structures with different length scales. At the rapid quenching rates of approximately 105 K s-1, structure formation in the eutectic alloy is qualitatively different. Partitionless solidification resulting in a supersaturated solid solution with the initial composition is observed in both eutectic

SUBMITTER: Gusakova OV 

PROVIDER: S-EPMC6460057 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature