Special cases of martensite compatibility: A near single-variant habit-plane and the martensite of nanocrystalline NiTi
Lattice parameters measured near the high temperature (~1000°C) bcc α to hcp β transformation in an intermetallic Mo-containing γ-TiAl based alloy indicate a middle valued eigenvalue of the corresponding deformation gradient near 1. Habit-planes calculated under the assumption of a simple slip as la...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2015-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/matecconf/20153303015 |
| _version_ | 1818615148435210240 |
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| author | Petersmann Manuel Antretter Thomas Waitz Thomas |
| author_facet | Petersmann Manuel Antretter Thomas Waitz Thomas |
| author_sort | Petersmann Manuel |
| collection | DOAJ |
| description | Lattice parameters measured near the high temperature (~1000°C) bcc α to hcp β transformation in an intermetallic Mo-containing γ-TiAl based alloy indicate a middle valued eigenvalue of the corresponding deformation gradient near 1. Habit-planes calculated under the assumption of a simple slip as lattice invariant shear, agree with experimentally determined orientations of the lens like plates recorded via electron backscattering. By contrast, twinning as invariant lattice shear has been investigated in nanocrystalline NiTi. Here the grain size causes the formation mechanism of the martensite to change from a “herring-bone” morphology faciliting a habit-plane between two twinned laminates and the austenite to a single laminate, which in the nonlinear theory formally cannot form a habit-plane with the austenite. Since this might cause high accommodation strains, the effectiveness of stress accommodation of martensite formed in neighboring grains of a polycrystal is investigated. Subsequent numerical microstructural modeling is outlined. The resulting energetically most favorable transformation sequence yields the transformation kinetics. |
| first_indexed | 2024-12-16T16:29:18Z |
| format | Article |
| id | doaj.art-47f0123d4a2841bdaaa491c35d6a00d0 |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-12-16T16:29:18Z |
| publishDate | 2015-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-47f0123d4a2841bdaaa491c35d6a00d02022-12-21T22:24:38ZengEDP SciencesMATEC Web of Conferences2261-236X2015-01-01330301510.1051/matecconf/20153303015matecconf_esomat2015_03015Special cases of martensite compatibility: A near single-variant habit-plane and the martensite of nanocrystalline NiTiPetersmann Manuel0Antretter Thomas1Waitz Thomas2Institute of Mechanics, Montanuniversitaet LeobenInstitute of Mechanics, Montanuniversitaet LeobenPhysics of Nanostructured Materials, Faculty of Physics, University of ViennaLattice parameters measured near the high temperature (~1000°C) bcc α to hcp β transformation in an intermetallic Mo-containing γ-TiAl based alloy indicate a middle valued eigenvalue of the corresponding deformation gradient near 1. Habit-planes calculated under the assumption of a simple slip as lattice invariant shear, agree with experimentally determined orientations of the lens like plates recorded via electron backscattering. By contrast, twinning as invariant lattice shear has been investigated in nanocrystalline NiTi. Here the grain size causes the formation mechanism of the martensite to change from a “herring-bone” morphology faciliting a habit-plane between two twinned laminates and the austenite to a single laminate, which in the nonlinear theory formally cannot form a habit-plane with the austenite. Since this might cause high accommodation strains, the effectiveness of stress accommodation of martensite formed in neighboring grains of a polycrystal is investigated. Subsequent numerical microstructural modeling is outlined. The resulting energetically most favorable transformation sequence yields the transformation kinetics.http://dx.doi.org/10.1051/matecconf/20153303015 |
| spellingShingle | Petersmann Manuel Antretter Thomas Waitz Thomas Special cases of martensite compatibility: A near single-variant habit-plane and the martensite of nanocrystalline NiTi MATEC Web of Conferences |
| title | Special cases of martensite compatibility: A near single-variant habit-plane and the martensite of nanocrystalline NiTi |
| title_full | Special cases of martensite compatibility: A near single-variant habit-plane and the martensite of nanocrystalline NiTi |
| title_fullStr | Special cases of martensite compatibility: A near single-variant habit-plane and the martensite of nanocrystalline NiTi |
| title_full_unstemmed | Special cases of martensite compatibility: A near single-variant habit-plane and the martensite of nanocrystalline NiTi |
| title_short | Special cases of martensite compatibility: A near single-variant habit-plane and the martensite of nanocrystalline NiTi |
| title_sort | special cases of martensite compatibility a near single variant habit plane and the martensite of nanocrystalline niti |
| url | http://dx.doi.org/10.1051/matecconf/20153303015 |
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