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Gamma Titanium Aluminide Alloys: Science and Technology

Gamma Titanium Aluminide Alloys: Science and Technology

Fritz Appel, Jonathan David Heaton Paul, Michael Oehring

ISBN: 978-3-527-31525-3

Oct 2011

762 pages

In Stock

$282.00

Description

The first book entirely dedicated to the topic emphasizes the relation between basic research and actual processing technologies. As such, it covers complex microstructures down to the nanometer scale, structure/property relationships and potential applications in key industries.

From the contents:

* Constitution
* Thermophysical Constants
* Phase Transformations and Microstructures
* Deformation Behaviour
* Strengthening Mechanisms
* Creep
* Fracture Behaviour
* Fatigue
* Oxidation Resistance and Related Issues
* Alloy Design
* Ingot Production and Component Casting
* Powder Metallurgy
* Wrought Processing
* Joining
* Surface Hardening
* Applications and Component Assessment
Preface

INTRODUCTION

CONSTITUTION
The Binary Ti-Al Phase Diagram
Ternary and Multicomponent Alloy Systems

THERMOPHYSICAL CONSTANTS
Elastic and Thermal Properties
Point Defects
Diffusion

PHASE TRANSFORMATIONS AND MICROSTRUCTURES
Microstructure Formation on Solidification
Solid State Transformations

DEFORMATION BEHAVIOR OF SINGLE-PHASE ALLOYS
Single-Phase Gamma(TiAl) Alloys
Deformation Behavior of Single-Phase Alpha2(Ti3Al) Alloys
Beta/B2 Phase Alloys

DEFORMATION BEHAVIOR OF TWO-PHASE ALPHA(Ti3Al) + GAMMA(TiAl) ALLOYS
Lamellar Microstructures
Deformation Mechanisms, Contrasting Single-Phase and Two-Phase Alloys
Generation of Dislocations and Mechanical Twins
Glide Resistance and Dislocation Mobility
Thermal and Athermal Stresses

STRENGTHENING MECHANISMS
Grain Refinement
Work Hardening
Solution Hardening
Precipitation Hardening
Optimized Nb-Bearing Alloys

DEFORMATION BEHAVIOR OF ALLOYS WITH A MODULATED MICROSTRUCTURE
Modulated Microstructures
Misfitting Interfaces
Mechanical Properties

CREEP
Design Margins and Failure Mechanisms
General Creep Behavior
The Steady-State or Minimum Creep Rate
Effect of Microstructure
Primary Creep
Creep-Induced Degradation of Lamellar Structures
Precipitation Effects Associated with the Alpha2 -> Gamma Phase Transformations
Tertiary Creep
Optimized Alloys, Effect of Alloy Composition and Processing
Creep Properties of Alloys with a Modulated Microstructure

FRACTURE BEHAVIOR
Length Scales in the Fracture of TiAl Alloys
Cleavage Fracture
Crack-Tip Plasticity
Fracture Toughness, Strength, and Ductility
Fracture Behavior of Modulated Alloys
Requirements for Ductility and Toughness
Assessment of Property Variability

FATIGUE
Definitions
The Stress-Life (S-N) Behavior
HCF
Effects of Temperature and Environment on the Cyclic Crack-Growth Resistance
LCF
Thermomechanical Fatigue and Creep Relaxation

OXIDATION BEHAVIOR AND RELATED ISSUES
Kinetics and Thermodynamics
General Aspects Concerning Oxidation
Summary

ALLOY DESIGN
Effect of Aluminum Content
Important Alloying Elements -
General Remarks
Specific Alloy Systems
Summary

INGOT PRODUCTION AND COMPONENT CASTING
Ingot Production
Casting
Summary

POWDER METALLURGY
Prealloyed Powder Technology
Elemental-Powder Technology
Mechanical Alloying

WROUGHT PROCESSING
Flow Behavior under Hot-Working Conditions
Conversions of Microstructure
Workabiliy and Primary Processing
Texture Evolution
Secondary Processing

JOINING
Diffusion Bonding
Brazing and Other Joining Technologies

SURFACE HARDENING
Shot Peening and Roller Burnishing
Residual Stresses, Microhardness, and Surface Roughness
Surface Deformation Due to Shot Peening
Phase Transformation, Recrystallization, and Amorphization
Effect of Shot Peening on Fatigue Strength
Thermal Stability of the Surface Hardening

APPLICATIONS, COMPONENT ASSESSMENT, AND OUTLOOK
Aerospace
Automotive
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