Micromechanical modeling of gamma-TiAl based alloys:
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | German |
| Published: |
Aachen
Shaker
2010
|
| Series: | Berichte aus der Materialwissenschaft
|
| Subjects: | |
| Online Access: | Inhaltsverzeichnis |
| Item Description: | Zsfassung in engl. und dt. Sprache |
| Physical Description: | 200 S. Ill., graph. Darst. |
| ISBN: | 9783832297176 |
Staff View
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| 245 | 1 | 0 | |a Micromechanical modeling of gamma-TiAl based alloys |c Claudio Zambaldi |
| 264 | 1 | |a Aachen |b Shaker |c 2010 | |
| 300 | |a 200 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 490 | 0 | |a Berichte aus der Materialwissenschaft | |
| 500 | |a Zsfassung in engl. und dt. Sprache | ||
| 502 | |a Zugl.: Aachen, Techn. Hochsch., Diss., 2010 | ||
| 650 | 0 | 7 | |a Titanaluminide |0 (DE-588)4470201-2 |2 gnd |9 rswk-swf |
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Record in the Search Index
| _version_ | 1804149626266189824 |
|---|---|
| adam_text | IMAGE 1
CONTENTS
ACKNOWLEDGMENT 9
I INTRODUCTION, LITERATURE REVIEW, AND STATE OF THE ART 17
1 GENERAL INTRODUCTION AND RESEARCH OBJECTIVES 19
1.1 INTRODUCTION 19
1.1.1 PRESENT AND FUTURE APPLICATIONS OF TITANIUM ALUMINIDES . . .. 19
1.1.2 RELATED LITERATURE 20
1.1.3 TIMELINE OF TITANIUM ALUMINIDE ALLOY DEVELOPMENT 20
1.2 MOTIVATION 20
1.3 RESEARCH OBJECTIVES 21
1.4 OUTLINE OF THIS THESIS 22
2 MICROSTRUCTURES OF Y-TIAL BASED ALLOYS 23
2.1 INTRODUCTION 23
2.2 THE TI-AL PHASE DIAGRAM 23
2.3 CRYSTALLOGRAPHIC PHASES IN Y-TIAL BASED ALLOYS 24
2.4 METALLURGY OF TITANIUM ALUMINIDES 26
2.5 PHASE TRANSFORMATION IN TITANIUM ALUMINIDES 27
2.6 BLACKBURN ORIENTATION RELATIONSHIP BETWEEN Y- AND CT2-PHASE 28
2.7 THE DOMAIN STRUCTURE OF Y-TIAL 28
2.8 FORMATION OF LAMELLAR MICROSTRUCTURES DURING SLOW COOLING 30
2.8.1 POLYCRYSTALLINE FULLY LAMELLAR (FL) MICROSTRUCTURES 33
2.8.2 POLYSYNTHETICALLY-TWINNED (PST) CRYSTALS 34
2.9 MASSIVE TRANSFORMATION DURING RAPID COOLING 34
BIBLIOGRAFISCHE INFORMATIONEN HTTP://D-NB.INFO/1010672061
DIGITALISIERT DURCH
IMAGE 2
CONTENTS
3 MICROMECHANICS OF TITANIUM ALUMINIDES 37
3.1 INTRODUCTION 37
3.2 LINEAR ELASTICITY 37
3.2.1 ELASTIC BEHAVIOR OF Y-TIAL 38
3.2.2 ELASTIC BEHAVIOR OF A 2 -TI 3 AL 40
3.3 INELASTIC DEFORMATION OF Y-TIAL 40
3.3.1 DEFORMATION OF Y-TIAL BY DISLOCATION GLIDE 40
3.3.2 DEFORMATION OF Y-TIAL BY TWINNING 43
3.4 DEFORMATION SYSTEMS OF HEXAGONAL ORDERED OT2-TI3 AL 44
3.5 NON-SCHMID EFFECT ON DISLOCATION GLIDE 47
3.6 KINEMATIC CONSTRAINTS AND HALL-PETCH EFFECT 47
3.6.1 ANISOTROPIE YIELD STRENGTH OF PST MATERIAL 47
3.6.2 HALL-PETCH EFFECT IN Y-TIAL BASED ALLOYS 49
3.6.3 PRE-YIELDING AND PRE-YIELD CRACKING 52
4 REVIEW OF CRYSTAL PLASTICITY MODELS OF Y-TIAL BASED ALLOYS 53 4.1
INTRODUCTION 53
4.2 THE 2D-CPFEM MODEL OF LEE, AHZI, KAD, DAO, ASARO 53
4.3 THE CPFEM MODEL OF PARTEDER, SCHLOEGL, MARKETZ, FISCHER, CLEMENS . 53
4.4 THE SELF-CONSISTENT CRYSTAL PLASTICITY MODEL OF LEBENSOHN ET AL 55
4.5 THE CPFEM MODEL OF WERWER, CORNEC AND OTHERS 55
4.6 THE CPFEM MODEL OF GRUJICIC, ZHANG, CAO AND BATCHU 55 4.7 THE CPFEM
MODEL OF BROCKMAN ET AL 56
4.8 THE CPFEM MODEL OF HERIPRE, ROOS ET AL 56
4.9 THE CPFEM MODEL OF BIELER ET AL 56
4.10 CONCLUSION 56
5 INSTRUMENTED INDENTATION 59
5.1 BASICS OF INDENTATION 59
5.1.1 HARDNESS TESTING AND INTERMETALLICS 59
5.1.2 INSTRUMENTED INDENTATION AND NANOINDENTATION 60
5.1.3 IDENTIFICATION OF CONSTITUTIVE PARAMETERS BY INSTRUMENTED IN-
DENTATION 62
5.2 INDENTER GEOMETRIES 63
5.2.1 BERKOVICH GEOMETRY 63
5.2.2 SPHERICAL AND SPHERO-CONICAL INDENTERS 64
5.2.3 TIP GEOMETRY IMPERFECTIONS 65
5.3 INDENTATION RESPONSE OF SINGLE CRYSTALS 65
5.3.1 STUDIES ON IONIC CRYSTALS, AND METALS WITH DIFFERENT CRYSTAL
STRUCTURES 65
5.3.2 INDENTATION PILE-UP AS THE FINGER PRINT OF SINGLE CRYSTAL
PLASTICITY 66 5.3.3 INCIPIENT PLASTICITY DURING SINGLE CRYSTAL
INDENTATION 68 5.4 CONTINUUM SIMULATION OF INDENTATION 69
5.5 NANOINDENTATION STUDIES ON TI-AL 70
12
IMAGE 3
CONTENTS
II MICROSTRUCTURAL AND MECHANICAL CHARACTERIZATION, AND CRYS- TAL
PLASTICITY MODELING OF Y-TIAL AND Y-TIAL BASED ALLOYS 73
INTRODUCTION TO THE RESULTS OF THIS THESIS 75
6 EBSD CHARACTERIZATION OF Y-TIAL ORDER DOMAINS 77
6.1 INTRODUCTION AND MOTIVATION 77
6.2 DISCRIMINATION OF Y-TIAL ORDER VARIANTS BY SUPERLATTICE REFLECTIONS
. . 77
6.3 LIMITATIONS OF CONVENTIONAL EBSD ANALYSIS OF Y-TIAL 79
6.4 ENHANCED ACCURACY EBSD PATTERN ANALYSIS 82
6.4.1 PATTERN CENTER CALIBRATION 82
6.4.2 ACCURATE KIKUCHI BAND DETECTION 83
6.4.3 ACCURATE AND ROBUST INDEXING AND THE FIT-RANK INDEXING METHOD 86
6.5 EXPERIMENTAL DETAILS 86
6.6 RESULTS AND DISCUSSION 87
6.6.1 VALIDATION OF THE PROPOSED FIT-RANK METHOD 87
6.6.2 ORIENTATION MAPPING OF THE ORDER DOMAIN STRUCTURE 91
6.6.3 FURTHER IMPROVEMENT OF THE ALGORITHM 93
6.7 CONCLUSIONS 95
7 CRYSTAL PLASTICITY MODELING OF Y-TIAL 97
7.1 MOTIVATION 97
7.2 THE FINITE STRAIN ELASTO-VISCOPLASTIC CRYSTAL PLASTICITY FORMULATION
. .. 97
7.2.1 CONTINUUM MECHANICS 98
7.2.2 THE CONSTITUTIVE MODEL 99
7.2.3 TIME-INTEGRATION OF THE PHENOMENOLOGICAL CRYSTAL PLASTICITY LAW
101
7.2.4 NUMERICAL APPROXIMATION OF THE MATERIAL POINT TANGENT STIFFNESS
103
7.3 IMPLEMENTATION OF ORDINARY AND SUPER DISLOCATION GLIDE SYSTEMS OF
Y-TI AL 103
7.4 IMPLEMENTATION OF TWINNING ON FOUR TRUE TWINNING SYSTEMS OF Y-TI AL
. 104
7.5 INCORPORATION OF THE SINGLE CRYSTAL CONSTITUTIVE LAW INTO THE FINITE
ELE- MENT METHOD 104
7.6 VALIDATION OF THE CPFEM IMPLEMENTATION OF THE DEFORMATION MODES .
105
7.7 DISCUSSION OF APPROPRIATE HARDENING PARAMETERS OF SINGLE PHASE
Y-TIAL 111
7.8 CONCLUSION 112
13
IMAGE 4
CONTENTS
8 SINGLE CRYSTAL INDENTATION OF Y-TIAL - EXPERIMENTS AND CPFEM MODELING
113
8.1 INTRODUCTION 113
8.2 INDENTATION EXPERIMENTS 113
8.2.1 EXPERIMENTAL METHODS 113
8.2.2 RESULTS OF INDENTATION EXPERIMENTS 114
8.2.3 EXPERIMENTALLY MEASURED PILE-UP TOPOGRAPHIES OF Y-TIAL . .. 117
8.2.4 DISCUSSION OF THE NANOINDENTATION RESULTS 123
8.3 CPFEM SIMULATION OF NANOINDENTATION IN Y-TIAL 123
8.3.1 A FINITE ELEMENT MODEL OF SINGLE CRYSTAL INDENTATION 123
8.3.2 INFLUENCE OF FRICTION ON SIMULATED PILE-UP PROFILES 124
8.3.3 ESTABLISHING THE MODEL AND THE CONSTITUTIVE PARAMETERS . . .. 125
8.3.4 COMPUTATIONAL COSTS OF THREE-DIMENSIONAL INDENTATION SIMULATIONL28
8.4 A METHOD FOR A COMBINED EXPERIMENTAL AND SIMULATION STUDY OF SINGLE
CRYSTAL INDENTATION 128
8.4.1 AN IN-PLANE ORIENTATION CONVENTION FOR THE UNIQUE REPRESENTA- TION
OF PILE-UP PROFILES 129
8.4.2 SIMULATION RESULTS FOR 51 ORIENTATIONS IN THE UNIT TRIANGLE . ..
131
8.4.3 DETAILED RESULTS FOR HIGH SYMMETRY ORIENTATIONS 132
8.4.4 COMPARISON OF EXPERIMENTAL AND SIMULATED PILE-UP TOPOGRAPHIES 133
8.5 DISCUSSION OF THE DEVELOPED NANOINDENTATION METHOD 134
8.5.1 RELATION BETWEEN SURFACE DEFORMATION AND PLASTIC ANISOTROPY . 134
8.5.2 POSSIBLE APPLICATIONS OF THE DEVELOPED METHOD 138
8.5.3 DISCUSSION OF THE INFLUENCE OF INDENTER SHAPE 138
8.5.4 ANALYSIS OF DEFORMATION MECHANISMS 139
8.5.5 THE ADVANTAGE OF RELYING ONLY ON HIGH PRECISION MEASURES . . 140
8.5.6 OTHER ADVANTAGES OF THE PRESENTED METHOD 140
8.5.7 PRELIMINARY ESTIMATE ON THE ANISOTROPIC HARDNESS OF Y-TI AL . .
140
8.6 CONCLUSIONS 142
9 A HOMOGENIZED CONSTITUTIVE LAW FOR TWO-PHASE Y/CT2 MICROSTRUCTURES 143
9.1 INTRODUCTION 143
9.2 RATIONALIZATION OF THE SELECTION OF INCORPORATED SLIP SYSTEMS 143
9.3 APPLICATION OF THE HOMOGENIZED MATERIAL LAW TO THE ANISOTROPIC PLAS-
TICITY OF PST-CRYSTALS 147
9.4 APPLICATION OF THE HOMOGENIZED LAW TO TWO DIFFERENT MICROSTRUCTURES
. 148
9.5 DISCUSSION 153
9.6 CONCLUSIONS 155
14
IMAGE 5
CONTENTS
III SUMMARY, OUTLOOK, AND BACKMATTER 157
10 SUMMARY AND MAIN CONCLUSIONS 159
11 OUTLOOK 161
A LITERATURE ON TITANIUM ALUMINIDES 163
A.I PROCEEDINGS 163
A.2 JOURNAL ISSUES 163
B CRYSTALLOGRAPHIC ORIENTATIONS 165
B.I BUNGE EULER ANGLES 165
B.2 GENERATION OF NEAR-EQUIDISTANT ORIENTATIONS 165
B.3 ORIENTATION REPRESENTATION OF THE HEXAGONAL PHASE 167
C PERIODIC BOUNDARY CONDITIONS 169
ABSTRACT 171
ZUSAMMENFASSUNG (GERMAN ABSTRACT) 173
BIBLIOGRAPHY 177
CURRICULUM VITAE 201
15
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| isbn | 9783832297176 |
| language | German |
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| series2 | Berichte aus der Materialwissenschaft |
| spelling | Zambaldi, Claudio 1978- Verfasser (DE-588)14384816X aut Micromechanical modeling of gamma-TiAl based alloys Claudio Zambaldi Aachen Shaker 2010 200 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Berichte aus der Materialwissenschaft Zsfassung in engl. und dt. Sprache Zugl.: Aachen, Techn. Hochsch., Diss., 2010 Titanaluminide (DE-588)4470201-2 gnd rswk-swf Superlegierung (DE-588)4137767-9 gnd rswk-swf Mikromechanik (DE-588)4205811-9 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Titanaluminide (DE-588)4470201-2 s Superlegierung (DE-588)4137767-9 s Mikromechanik (DE-588)4205811-9 s DE-604 DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025382828&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Zambaldi, Claudio 1978- Micromechanical modeling of gamma-TiAl based alloys Titanaluminide (DE-588)4470201-2 gnd Superlegierung (DE-588)4137767-9 gnd Mikromechanik (DE-588)4205811-9 gnd |
| subject_GND | (DE-588)4470201-2 (DE-588)4137767-9 (DE-588)4205811-9 (DE-588)4113937-9 |
| title | Micromechanical modeling of gamma-TiAl based alloys |
| title_auth | Micromechanical modeling of gamma-TiAl based alloys |
| title_exact_search | Micromechanical modeling of gamma-TiAl based alloys |
| title_full | Micromechanical modeling of gamma-TiAl based alloys Claudio Zambaldi |
| title_fullStr | Micromechanical modeling of gamma-TiAl based alloys Claudio Zambaldi |
| title_full_unstemmed | Micromechanical modeling of gamma-TiAl based alloys Claudio Zambaldi |
| title_short | Micromechanical modeling of gamma-TiAl based alloys |
| title_sort | micromechanical modeling of gamma tial based alloys |
| topic | Titanaluminide (DE-588)4470201-2 gnd Superlegierung (DE-588)4137767-9 gnd Mikromechanik (DE-588)4205811-9 gnd |
| topic_facet | Titanaluminide Superlegierung Mikromechanik Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025382828&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| work_keys_str_mv | AT zambaldiclaudio micromechanicalmodelingofgammatialbasedalloys |