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Titre : Kinetic study of the metastable phase in 12-carat gold alloys Type de document : texte imprimé Auteurs : Sarra Amara ; Imene Lamiri, Directeur de thèse Editeur : Setif:UFA Année de publication : 2021 Importance : 1 vol. (59 f.) Format : 29 cm Langues : Français (fre) Catégories : Thèses & Mémoires:Physique Mots-clés : Alliages d'or 12 carats Index. décimale : 530 Physique Note de contenu :
contents
General introduction ............................................................................................................................... 1
ChapterI: order-disorder transformations ........................................................................................... 2
Introduction ........................................................................................................................................... 3
I.1. Definition of Alloy .............................................................................................................................. 3
I.2. Solid solutions ................................................................................................................................. 4
I.2.1. Types of solid solutions .................................................................................................................. 4
I.2.1.1. Interstitial Solid Solution ............................................................................................................ 4
I.2.1.2. Substitutional Solid Solutions ...................................................................................................... 5
I.3. Order and disorder in solid solutions ................................................................................................ 5
b- Ordered solid solution ........................................................................................................................ 5
I.4. Definition of the phase transformation ............................................................................................ 5
I.5. Order in alloys .................................................................................................................................. 6
I.6.1 Variation of the order parameter with the temperature ............................................................... 7
I.6.2. The Influence of the order on the physical properties of the alloys .............................................. 9
I.6.3. Defects in structures .................................................................................................................... 12
I.7. Characteristics and ordering process in AuCu and AuCuAg systems ............................................. 18
I.7.1.1. Order-disorder transitions in the AuCu binary system. ................................................... 18
I.7.1.2. Equilibrium phase diagram of AuCu binary system ......................................................... 18
I.7.1.3. Setting in order in the AuCu3 alloy .................................................................................... 20
I.7.1.4. The ordered phase AuCu .................................................................................................. 21
I.7.1.5. The ordered phase Au3Cu ................................................................................................ 22
I.7.1.6. Stability of AuCuII phase .................................................................................................. 22
I.7.2. Order-disorder transitions in the AuCuAg ternary system ................................................. 23
Bibliography ......................................................................................................................................... 25
Chapter II: Materials and methods ....................................................................................................26
Introduction: ........................................................................................................................................ 27
II. Materials and methods ..................................................................................................................... 27
II.1. Preparation of the alloys ................................................................................................................ 27
II-2. Characterization ............................................................................................................................. 28
II.2.1. Thermal analyses ................................................................................................................. 28
II.2.2 Morphological analyzes ........................................................................................................ 28
II.2.3 furtherused techniques ....................................................................................................... 28
II.3. The used characterization techniques .......................................................................................... 29
II.3.1. Electron Probe Microanalysis (EPMA) ......................................................................................... 29
II.3.2. The X-ray diffraction .................................................................................................................... 30
II.3.3. Differential scanning calorimetry: ............................................................................................... 31
II.3.4. Dilatometric analyses: ................................................................................................................. 32
II.3.5. Scanning Electron Microscopy (SEM) ......................................................................................... 33
II.3.6. Scanning Tunneling Microscopy (STM) ....................................................................................... 34
II.3.7. X-Ray Photoelectron Spectroscopy (XPS) .................................................................................. 37
IV. Conclusion ....................................................................................................................................... 38
Chapter III : Results and discussions ..................................................................................................40
III. Results and discussions .................................................................................................................... 41
Introduction: ........................................................................................................................................ 41
III.1. Results of previous experiments on AuCu equiatomic system: .................................................... 41
III.2.1. DSC and Dilatometric studies: .................................................................................................... 41
III.2.2. Morphological study (SEM and STM) ......................................................................................... 45
III.2.2.1. SEM study from the disordered state ..................................................................................... 45
III.2.2.2. SEM study from the ordered state .......................................................................................... 52
III.2.2.3. STM study ............................................................................................................................... 53
II.2.3. Further techniques ...................................................................................................................... 56
III.3. Conclusion .................................................................................................................................... 58Côte titre : MAPH/0474 En ligne : https://drive.google.com/file/d/10CctagemNUnilEVTXVwAD1srp8W8tGs5/view?usp=shari [...] Format de la ressource électronique : Kinetic study of the metastable phase in 12-carat gold alloys [texte imprimé] / Sarra Amara ; Imene Lamiri, Directeur de thèse . - [S.l.] : Setif:UFA, 2021 . - 1 vol. (59 f.) ; 29 cm.
Langues : Français (fre)
Catégories : Thèses & Mémoires:Physique Mots-clés : Alliages d'or 12 carats Index. décimale : 530 Physique Note de contenu :
contents
General introduction ............................................................................................................................... 1
ChapterI: order-disorder transformations ........................................................................................... 2
Introduction ........................................................................................................................................... 3
I.1. Definition of Alloy .............................................................................................................................. 3
I.2. Solid solutions ................................................................................................................................. 4
I.2.1. Types of solid solutions .................................................................................................................. 4
I.2.1.1. Interstitial Solid Solution ............................................................................................................ 4
I.2.1.2. Substitutional Solid Solutions ...................................................................................................... 5
I.3. Order and disorder in solid solutions ................................................................................................ 5
b- Ordered solid solution ........................................................................................................................ 5
I.4. Definition of the phase transformation ............................................................................................ 5
I.5. Order in alloys .................................................................................................................................. 6
I.6.1 Variation of the order parameter with the temperature ............................................................... 7
I.6.2. The Influence of the order on the physical properties of the alloys .............................................. 9
I.6.3. Defects in structures .................................................................................................................... 12
I.7. Characteristics and ordering process in AuCu and AuCuAg systems ............................................. 18
I.7.1.1. Order-disorder transitions in the AuCu binary system. ................................................... 18
I.7.1.2. Equilibrium phase diagram of AuCu binary system ......................................................... 18
I.7.1.3. Setting in order in the AuCu3 alloy .................................................................................... 20
I.7.1.4. The ordered phase AuCu .................................................................................................. 21
I.7.1.5. The ordered phase Au3Cu ................................................................................................ 22
I.7.1.6. Stability of AuCuII phase .................................................................................................. 22
I.7.2. Order-disorder transitions in the AuCuAg ternary system ................................................. 23
Bibliography ......................................................................................................................................... 25
Chapter II: Materials and methods ....................................................................................................26
Introduction: ........................................................................................................................................ 27
II. Materials and methods ..................................................................................................................... 27
II.1. Preparation of the alloys ................................................................................................................ 27
II-2. Characterization ............................................................................................................................. 28
II.2.1. Thermal analyses ................................................................................................................. 28
II.2.2 Morphological analyzes ........................................................................................................ 28
II.2.3 furtherused techniques ....................................................................................................... 28
II.3. The used characterization techniques .......................................................................................... 29
II.3.1. Electron Probe Microanalysis (EPMA) ......................................................................................... 29
II.3.2. The X-ray diffraction .................................................................................................................... 30
II.3.3. Differential scanning calorimetry: ............................................................................................... 31
II.3.4. Dilatometric analyses: ................................................................................................................. 32
II.3.5. Scanning Electron Microscopy (SEM) ......................................................................................... 33
II.3.6. Scanning Tunneling Microscopy (STM) ....................................................................................... 34
II.3.7. X-Ray Photoelectron Spectroscopy (XPS) .................................................................................. 37
IV. Conclusion ....................................................................................................................................... 38
Chapter III : Results and discussions ..................................................................................................40
III. Results and discussions .................................................................................................................... 41
Introduction: ........................................................................................................................................ 41
III.1. Results of previous experiments on AuCu equiatomic system: .................................................... 41
III.2.1. DSC and Dilatometric studies: .................................................................................................... 41
III.2.2. Morphological study (SEM and STM) ......................................................................................... 45
III.2.2.1. SEM study from the disordered state ..................................................................................... 45
III.2.2.2. SEM study from the ordered state .......................................................................................... 52
III.2.2.3. STM study ............................................................................................................................... 53
II.2.3. Further techniques ...................................................................................................................... 56
III.3. Conclusion .................................................................................................................................... 58Côte titre : MAPH/0474 En ligne : https://drive.google.com/file/d/10CctagemNUnilEVTXVwAD1srp8W8tGs5/view?usp=shari [...] Format de la ressource électronique : Exemplaires (1)
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