Modification of Al-Si alloys: Microstructure, thermal analysis, and mechanisms

Document Type

Article

Publication Date

2-1995

Department

Department of Materials Science and Engineering

Abstract

In aluminum-silicon cast alloys, the shapes of the silicon phase and the general solidification pattern can be changed by the cooling conditions and by minor additions to the melt. The minor additions either cause modification (sodium, strontium, and other metals) or refine the primary silicon in hypereutectic alloys (phosphorus and elements of Group V-B). Detailed examination of the modified microstructures and analysis of cooling curves are compatible with a modification mechanism involving growth rather than nucleation kinetics.

Publication Title

JOM

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