Eutectic Solidification Processing

Crystalline and Glassy Alloys

1st Edition - November 1, 1983
Author: Roy Elliott
Language: English
eBook ISBN:
9 7 8 - 1 - 4 8 3 1 - 4 4 8 1 - 8

Eutectic Solidification Processing: Crystalline and Glassy Alloys deals with solidification theory and its application to eutectic processing of crystalline and glassy alloys. The… Read more

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Eutectic Solidification Processing: Crystalline and Glassy Alloys deals with solidification theory and its application to eutectic processing of crystalline and glassy alloys. The underlying theme is an analysis of the different paths taken by the liquid-solid transformation as the cooling rate increases and a description of the structure and properties of the solid formed, ranging from equilibrium to metastable phase formation in castings, to metallic glass formation in splat quenched ribbons. This text has seven chapters; the first of which describes the main characteristics of the liquid-solid transformation. The chapters that follow show how control over composition, trace impurities, heat flow and cooling rate, and nucleation and growth gives rise to a wide range of solidification structures. Models of the nucleation and growth of eutectic and primary phases are analyzed and used to explain how cast microstructures are formed. Aluminum casting alloys and all types of cast iron are discussed, along with primary phase formation, the dependence of the extent of segregation on solidification conditions, and the practice of segregation prevention during solidification. This book also describes the importance of fluid flow in producing macroscopic segregation in large ingots and considers ways of minimizing this defect. Finally, this book gives a brief account of the various types of metallic glasses, their fabrication, important properties, and potential applications. This book will be of interest to materials scientists and industrial materials engineers.

1 The Liquid-Solid Transformation in Alloys Close to the Eutectic Composition Introduction Thermodynamic Criterion for Liquid-Solid Equilibrium in a Metal The Liquid-Solid Transformation in a Metal Thermodynamic Criterion for Equilibrium in Alloys The Liquid-Solid Transformation in an Alloy Diffusionless Solidification The Liquid-Glass Transformation in Alloys Metastable-Phase Formation in the Liquid-Solid Transformation References2 The Eutectic Solidification Process Introduction Nucleation in Eutectic Solidification Homogeneous Nucleation Heterogeneous Nucleation Nucleation and Characteristics of a Eutectic Grain The Grain Structure of a Casting References3 Growth in Normal Eutectic Solidification Introduction The Steady-State Lamellar Growth Problem The Jackson and Hunt Analysis Experimental Observations during Lamellar Growth Other Features of the Jackson and Hunt Theory Assessment of the Jackson and Hunt Analysis The Analysis of Lamellar Growth References4 Growth in Anomalous Eutectic Solidification Introduction Criterion for Faceting during Growth The Classification of Eutectic Microstructures Anomalous Structures References5 Aluminum-Silicon Alloys and Cast Irons: Commercially Important Anomalous Alloys Introduction Aluminum-Silicon Eutectic Structures Types and Properties of Aluminum Alloys Types and Properties of Cast Iron References6 Primary-Phase Solidification in Alloys Close to the Eutectic Composition Introduction Faceted Primary-Phase Morphologies Non-Faceted Primary-Phase Morphology The Brody-Flemings Model of a Dendritic Array Developments of the Brody-Flemings Model Alternative Models of the Dendritic Array The Influence of Fluid Flow on Solidification The Coupled Zone Monotectic Solidification References7 Production, Properties and Uses of In-Situ Composites and Metallic Glasses Production of In-Situ Composites Tensile Behavior of In-Situ Composites Creep Behavior of In-Situ Composites Fatigue Behavior of In-Situ Composites Microstructural Stability of In-Situ Composites The Production of Metastable Structures and Metallic Glasses The Properties and Uses of Metallic Glasses ReferencesIndex