The Bravais lattice basis of hexagonal crystals

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Table of contents

Chapter 1 Literature review
1.1 General introduction
1.2 The Electric Current Pulses (ECP) technology
1.2.1 Introduction
1.2.2 The phase transformation induced by ECP
1.3 Crystal defect associated solid-state phase transformation
1.3.1 Basic crystal defects of metallic materials
1.3.2 The effect of the defects on the phase transformation
1.3.3 The dislocation mechanism on the phase transformation
1.3.4 Crystal defect type associated transformation OR selection
1.4 Phase transformations in Cu-Zn alloys
1.5 Content of the present work
Chapter 2 Experimental and calculation methods
2.1 Experimental details
2.1.1 Alloy preparation and heat treatment
2.1.2 ECP treatments
2.1.3 X-ray diffraction measurement
2.1.4 Microstructural characterization
2.1.5 Chemical composition analysis
2.2 Basic crystallographic calculations
2.2.1 Coordinate system
2.2.2 Coordinate transformation and orientation relation
2.2.3 Stereographic projection
2.2.4 Deformation gradient tensor
2.2.5 Trace analysis method
2.2.6 Twinning elements
2.2.7 Hexagonal coordinates
Chapter 3 Microstructure and crystallographic characteristics of Cu-40％Zn alloy after the ECP treatments
3.1 Introduction
3.2 Experimental
3.3 Results
3.3.1 Phase constituents and lattice constants
3.3.2 Microstructure characteristics
3.3.3 Chemical composition distribution characteristics
3.3.4 Orientation relationship (OR) between α ̸ β
3.3.5 Morphology of intragranular β (βGI)
3.4 Discussion
3.4.1 The thermal effect of the ECP
3.4.2 The electrical effect of the ECP
3.4.3 The lattice strain effect
3.5 Summary
Chapter 4 Crystal defects produced by α to β phase transformation during ECP in Cu-40％Zn alloy
4.1 Introduction
4.2 Experimental
4.3 Results
4.3.1 Microstructural characteristics
4.3.2 Crystal defect characteristics
4.4 Discussion
4.5 Summary
Chapter 5 Sub-structure of β precipitates formed by ECP treatment in Cu-40％Zn alloy
5.1 Introduction
5.2 Experimental
5.3 Results
5.3.1 Microstructural characteristics
5.3.2 Identification of sub structures in β precipitates
5.3.3 Identification of atomic shuffling and displacement system to realize the structure change
5.3.4 Origin of concomitant formation of the two hexagonal structures
5.4 Summary
Chapter 6 Conclusions and Perspectives
6.1 Conclusions
6.2 Perspectives
References