Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga:
Gespeichert in:
| 1. Verfasser: | |
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| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
2012
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| Schlagworte: | |
| Online-Zugang: | kostenfrei https://nbn-resolving.org/urn:nbn:de:bvb:91-diss-20121207-1120705-1-3 Inhaltsverzeichnis |
| Beschreibung: | X, 133 S. Ill., graph. Darst. |
Internformat
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| 100 | 1 | |a Ener, Semih |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga |c Semih Ener |
| 264 | 1 | |c 2012 | |
| 300 | |a X, 133 S. |b Ill., graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
| 337 | |b n |2 rdamedia | ||
| 338 | |b nc |2 rdacarrier | ||
| 502 | |a München, Techn. Univ., Diss., 2012 | ||
| 655 | 7 | |0 (DE-588)4113937-9 |a Hochschulschrift |2 gnd-content | |
| 776 | 0 | 8 | |i Erscheint auch als |n Online-Ausgabe |o urn:nbn:de:bvb:91-diss-20121207-1120705-1-3 |
| 856 | 4 | 1 | |u http://mediatum.ub.tum.de/node?id=1120705 |x Verlag |z kostenfrei |3 Volltext |
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Datensatz im Suchindex
| _version_ | 1804150202717700098 |
|---|---|
| adam_text | IMAGE 1
CONTENTS
1 INTRODUCTION 1
2 HEUSLER ALLOYS A N D S H A P E M E M O R Y EFFECT 7
2.1 HEUSLER ALLOYS 7
2.2 MARTENSITIC TRANSFORMATIONS 8
2.3 SHAPE MEMORY EFFECT (SME) 12
2.3.1 MAGNETIC FIELD INDUCED SHAPE MEMORY EFFECT 14
2.4 NI-MN-GA ALLOYS 17
3 M E T H O D S 2 1
3.1 SAMPLE PREPARATION 21
3.2 SAMPLE CHARACTERIZATION METHODS 23
3.2.1 MAGNETIC MEASUREMENTS 23
3.2.2 CALORIMETRIC MEASUREMENTS 24
3.2.3 CHEMICAL COMPOSITIONAL ANALYSIS 25
3.3 NEUTRON SCATTERING 25
4 THEORETICAL M O D E L S O F T H E LATTICE D Y N A M I C S 3 3
4.1 CLASSICAL THEORY 33
4.2 QUANTUM THEORY 35
4.3 BORN-VON KARMAN MODEL 37
4.3.1 PHONON RELATED CALCULATIONS: DEBYE AND EINSTEIN MODELS 38
5 SAMPLE PROPERTIES A N D P H A S E DIAGRAMS 4 3
5.1 CHEMICAL AND PHYSICAL CHARACTERIZATION 43
5.1.1 CHEMICAL COMPOSITIONAL ANALYSIS RESULTS 44
5.1.2 CALORIMETRIC ANALYSIS RESULTS 46
5.1.3 MAGNETIC AND MAGNETOCALORIC PROPERTIES 47
5.1.4 ELASTIC MEASUREMENTS OF NI-MN-GA ALLOYS 51
IX
HTTP://D-NB.INFO/1036160300
IMAGE 2
X CONTENTS
6 P H O N O N S IN N I - M N - G A ALLOYS 5 7
6.1 PHONON DISPERSIONS IN THE AUSTENITE PHASES 58
6.1.1 AUSTENITE PHONON DISPERSION OF STOICHIOMETRIC NI2MNGA 59 6.1.2
BORN-VON KARMAN MODEL FIT TO THE NI2MNGA 61
6.1.3 AUSTENITE PHONON DISPERSION OF OFFSTOICHIOMETRIC NI49MN 32 GAI9 .
. 64 6.1.4 BORN-VON KARMAN MODEL FIT TO THE NI49MN 32 GAI9 65
6.2 PHONON DISPERSION IN THE MARTENISTE PHASES 67
6.2.1 PHONON DISPERSION OF NI 5 OMN2GGA2I IN FIVE-LAYERED MODULATED (5M)
MARTENSITE PHASE 68
6.2.2 PHONON DISPERSION OF NON-MODULATED MARTENSITE IN NI 5 OMN 3 OGA2O
69
6.2.3 PHONON DISPERSION OF SEVEN-LAYER MODULATED (7M) MARTENSITE OF
NI49MN 3 IGA 2 O 70
6.2.4 LOW FREQUENCY EXCITATIONS OF MARTENSITE AND PREMARTENSITE PHASES
71 6.3 TEMPERATURE DEPENDENCE OF THE SOFTENING IN THE AUSTENITE PHASES .
. . . . 73 6.4 COMPOSITION AND PHASE DEPENDENCE OF TA 2 [0] 76
7 DISCUSSIONS 7 9
7.1 CRYSTALLOGRAPHIC STRUCTURES OF AUSTENITE AND
MARTENSITE PHASES 79
7.2 VIBRATIONAL PROPERTIES OF AUSTENITE PHASES 80
7.3 TEMPERATURE DEPENDENCE OF THE TA 2 [0] PHONON MODES 90
7.4 VIBRATIONAL PROPERTIES OF MARTENSITE PHASES 95
7.4.1 VIBRATIONAL PROPERTIES OF NI5 0 MN 29 GA2I IN 5M MARTENSITE PHASE
. . 95 7.4.2 VIBRATIONAL PROPERTIES OF NI 5 OMN 3 OGA2O IN NM MARTENSITE
PHASE . . 97 7.4.3 LOW FREQUENCY EXCITATIONS OF PRE-MARTENSITE AND
MARTENSITE PHASES 100 7.5 EFFECT OF MECHANICAL TRAINING ON THE
MARTENSITES 101
7.6 RELATION OF ENTROPY WITH THE PHASE STABILITY 103
8 S U M M A R Y A N D OUTLOOK 107
BIBLIOGRAPHY 113
LIST O F PUBLICATIONS 125
ACKNOWLEDGEMENTS 127
A P P E N D I X 128
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| spelling | Ener, Semih Verfasser aut Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga Semih Ener 2012 X, 133 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier München, Techn. Univ., Diss., 2012 (DE-588)4113937-9 Hochschulschrift gnd-content Erscheint auch als Online-Ausgabe urn:nbn:de:bvb:91-diss-20121207-1120705-1-3 http://mediatum.ub.tum.de/node?id=1120705 Verlag kostenfrei Volltext https://nbn-resolving.org/urn:nbn:de:bvb:91-diss-20121207-1120705-1-3 Resolving-System DNB Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025888595&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Ener, Semih Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga |
| subject_GND | (DE-588)4113937-9 |
| title | Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga |
| title_auth | Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga |
| title_exact_search | Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga |
| title_full | Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga Semih Ener |
| title_fullStr | Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga Semih Ener |
| title_full_unstemmed | Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga Semih Ener |
| title_short | Lattice dynamics in ferromagnetic shape memory alloy system Ni-Mn-Ga |
| title_sort | lattice dynamics in ferromagnetic shape memory alloy system ni mn ga |
| topic_facet | Hochschulschrift |
| url | http://mediatum.ub.tum.de/node?id=1120705 https://nbn-resolving.org/urn:nbn:de:bvb:91-diss-20121207-1120705-1-3 http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=025888595&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| work_keys_str_mv | AT enersemih latticedynamicsinferromagneticshapememoryalloysystemnimnga |