Isothermal compression under in-situ neutron diffraction

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Table of contents

Chapter 1 Literature review
1.1 General introduction
1.2 Crystal structure and classification of titanium alloys
1.2.1 Crystal structure of pure titanium
1.2.2 Classification of titanium alloy
1.3 Phase transformation under thermal or thermomechanical processing in metastable β titanium alloys
1.3.1 β to α phase transformation
1.3.2 Variant selection during β to α phase transformation
1.4 Hot deformation behavior of metastable β titanium alloy
1.4.1 Hot deformation in single β phase region
1.4.2 Hot deformation in α+β phase region
1.4 Organization of the thesis
Chapter 2 Materials, experimental details and basic crystallographic calculations
2.1 Materials preparation
2.2 Experimental details
2.2.1 Thermal mechanical processing
2.2.2 Determination of the lattice constants
2.2.3 Isothermal compression under in-situ neutron diffraction
2.2.4 Microstructural and crystallographic characterization
2.3 Basic crystallographic calculation
2.3.1 Coordinate system setting
2.3.2 Coordinate transformation
2.3.3 Stereographic projection
2.3.4 Misorientation
2.3.5 Trace analysis method
2.3.6 Deformation gradient tensor
Chapter 3 Microstructure evolution and phase transformation under heat treatment 
3.1 Introduction
3.2 Experimental
3.3 Microstructure of the initial β phase and lattice constant information
3.4 Phase transformation under heat treatment
3.4.1 Microstructure characteristics of α precipitates
3.4.2 Sub-structures of intragranular α precipitates
3.5 Formation mechanisms of sub-structures of intragranular α precipitates
3.5.1 Phase transformation lattice strain characters
3.5.2 Formation mechanism of interface α and local variant selection of major α
3.5.3 Formation mechanism of non BOR α domains
3.6 Summary
Chapter 4 Phase transformation and α variant selection mechanism during isothermal compression
4.1 Introduction
4.2 Experimental
4.3 Microstructure of the initial β phase
4.4 Phase transformation and α variant selection during 700 oC compression
4.4.1 Phase transformation and α variant selection in stress-free state
4.4.2 Phase transformation and α variant selection under 700 °C isothermal compression
4.4.3 Variant selection mechanisms
4.5 Phase transformation and α variant selection during 600oC compression
4.5.1 Phase transformation and α variant selection during heat treatment
4.5.2 Phase transformation and α variant selection during 600 °C isothermal compression
4.6 Summary
Chapter 5 Correlation between microstructure evolution and deformation behavior during isothermal compression
5.1 Introduction
5.2 Experimental
5.3 Microstructure of the initial β phase
5.4 Correlation between microstructure evolution and hot deformation behavior during 700oC compression
5.4.1 Mechanical behavior
5.4.2 Correlation between microstructure and deformation behavior
5.5 Correlation between microstructure evolution and hot deformation behavior during 600oC compression
5.5.1 Mechanical behavior
5.5.2 Correlation between microstructure and deformation behavior
5.6 Summary
Chapter 6 Conclusions and Perspectives
6.1 Conclusions
6.2 Perspectives