Aluminum-Silicon Casting Alloys: Atlas of Microstructures

The Aluminum-Silicon Casting Alloys: Atlas of Microstructures provides any engineer or researcher who works with aluminum castings with a practical and substantive tool for the visual analysis of the microscopic images of the microstructure of the aluminum casting alloys, as examined during routine laboratory procedures. The gallery of microstructure images presented in the Atlas has been selected and put in a systematic order with two main goals in mind:

• Help the reader who has an image of an alloy microstructure
  identify the examined alloy in a gallery of standard casting Al-Si alloys
• Help the reader to identify the typical microstructure of an alloy
  based on its estimated cooling rate

The Atlas was composed considering the cast part as a complex construction of crystallites, described in the context of particular technological conditions and initial chemical composition. Chapters I and II discuss the characteristics of the main phase constituents: α-Al solid solution and silicon crystals (Ch. I), and intermetallic phases (Ch. II). Chapter III presents an atlas of the microstructures of Al-Si cast parts, designated according to standard PN EN 1706, taking into account its counterparts in ASTM-standards. Chapter IV presents the metallographic procedure of the visual identification of the alloy phase constituents.

CONTENTS

INTRODUCTION

CHAPTER I. CAST AL-SI ALLOY - PHASE CONSTITUENTS AND MICROSTRUCTURE
   Phase Constituents of Cast Al-Si Alloy
   Structure of the Cast Part of Al-Si Alloy in As Cast State
   Silicon Crystals
   The (α-Al+Si) Eutectic
   Casting Technology Influence on Eutectic Si Morphology
   Summary

CHAPTER II. INTERMETALLIC PHASES IN THE AL-SI TECHNICAL CASTING ALLOY
    Intermetallic Phases in Aluminum Alloys

CHAPTER III. MICROSTRUCTURE OF THE AL-SI TECHNICAL CASTING ALLOYS
   AlSi7Mg
   AlSi10Mg
   AlSi11
   AlSi12CuNiMg
   AlSi21CuNi
   AlSi5Cu1
   AlSi5Cu3Mg
   AlSi6Cu4
   AlSi9Cu1Mg
   Morphological Evolution of the Intermetallic Phases as Influenced by Technological Conditions

CHAPTER IV. VISUAL IDENTIFICATION OF MICROSTRUCTURAL CONSTITUENTS BASED ON MICROSCOPIC OBSERVATIONS OF THE METALLOGRAPHIC CROSS SECTIONS
   Visual Attributes of the Intermetallic Phase Precipitates in Al Alloy Microstructure
   Selective Etching Procedures for Revealing the Phase Constituents in Microscopic Observations    of the Metallographic Cross Sections
   Atlas of the Selective Etching Effects of the Intermetallic Phases in Al Alloy Microstructure

APPENDICES
   Intermetallic Phase Designations
   Symbols and Abbreviations

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