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The development of refined microstructures for dispersion strengthening of Aluminum alloys by rapid solidification is related to the undercooling at nucleation and during competitive crystal growth. With controlled droplet samples the important processing parameters that govern undercooling in the powders have been identified and include powder size and coating melt cooling rate and superheat. The droplet method has yielded measured undercoolings of 175 C for AL and values near 300 C for some AL alloys. Droplet studies have been valuable in examining the solidification pathways including thermal history effects associated with rapid solidification and dispersoid formation in Aluminum-Nickel, Aluminum-Iron, and Aluminum-Beryllium alloys. Based on the analysis of solidification pathways, microstructure maps may be developed to identify the processing that can yield fine-scale eutectics, metastable structures or suppression of coarse primary intermetallic phases which are useful for the development of dispersoid structures. (jg).
Pulling together information previously scattered throughout numerous research articles into one detailed resource, this book connects the fundamentals of structure formation during solidification with the practically observed structure and defect patterns in billets and ingots. The author examines the formation of a structure, properties, and defects in the as-cast material in tight correlation to the physical phenomena involved in the solidification and the process parameters. Compiling recent results and data, the book discusses the fundamentals of solidification together with metallurgical and technological aspects of DC casting. It gives new insight and perspective into DC casting research.
This is the first book to generalize and analyze the extensive experimental and theoretical results on the phase composition, structure, and properties of aluminum alloys containing scandium. The effects of scandium on these properties are studied from a physico- chemical viewpoint. The authors present binary, ternary, and more complex phase diagrams for these alloys and consider in detail recrystallization, superplastic behavior, and decomposition of supersaturated solid solutions and the effects of solidification conditions on phase equilibria.