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| rdf:type
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| Description
| - In this study, the nano-crystalline Nitinol (50.9 at.% Ni) was prepared by 40% cold deformation. Subsequently it was subjected to 15-min-heat treatments at 300-550 degrees C. Changes of the structure and mechanical properties were studied by transmission electron microscopy, micro X-ray diffraction, differential scanning calorimetry, Vickers hardness measurements, tensile and bend-type fatigue testing. It was shown that the cold drawn material contains textured nano-crystalline B2 grains of 50 nm in thickness and a high concentration of lattice defects. Its tensile strength, hardness and fatigue life were 1521 MPa, 421 HV0.05 and 2435 bending cycles to fracture, respectively. After heat-treatment up to 450 degrees C/15 mm the material underwent Ni4Ti3 precipitation and partial recovery processes. Heat-treatments at above 450 degrees C induced recrystallization, grain and precipitate growth. Hardness and fatigue lives showed maxima of 692 HV0.05 and 5883 cycles, respectively, after heat-treatments at 450 degrees C/ 15 min. In contrast, both tensile strength and B2 -} B19' transformation stress decreased with increasing heat-treatment temperature, but a decrease of the tensile strength after heat-treatments at 300-450 degrees C was slow (tensile strength after heat-treatment at 450 degrees C/15 mm was 1486 MPa). The observed variations of mechanical characteristics were discussed in relation to structural changes observed: (C) 2014 Elsevier Ltd. All rights reserved.
- In this study, the nano-crystalline Nitinol (50.9 at.% Ni) was prepared by 40% cold deformation. Subsequently it was subjected to 15-min-heat treatments at 300-550 degrees C. Changes of the structure and mechanical properties were studied by transmission electron microscopy, micro X-ray diffraction, differential scanning calorimetry, Vickers hardness measurements, tensile and bend-type fatigue testing. It was shown that the cold drawn material contains textured nano-crystalline B2 grains of 50 nm in thickness and a high concentration of lattice defects. Its tensile strength, hardness and fatigue life were 1521 MPa, 421 HV0.05 and 2435 bending cycles to fracture, respectively. After heat-treatment up to 450 degrees C/15 mm the material underwent Ni4Ti3 precipitation and partial recovery processes. Heat-treatments at above 450 degrees C induced recrystallization, grain and precipitate growth. Hardness and fatigue lives showed maxima of 692 HV0.05 and 5883 cycles, respectively, after heat-treatments at 450 degrees C/ 15 min. In contrast, both tensile strength and B2 -} B19' transformation stress decreased with increasing heat-treatment temperature, but a decrease of the tensile strength after heat-treatments at 300-450 degrees C was slow (tensile strength after heat-treatment at 450 degrees C/15 mm was 1486 MPa). The observed variations of mechanical characteristics were discussed in relation to structural changes observed: (C) 2014 Elsevier Ltd. All rights reserved. (en)
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| Title
| - Structural and mechanical stability of the nano-crystalline Ni-Ti (50.9 at.% Ni) shape memory alloy during short-term heat treatments
- Structural and mechanical stability of the nano-crystalline Ni-Ti (50.9 at.% Ni) shape memory alloy during short-term heat treatments (en)
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| skos:prefLabel
| - Structural and mechanical stability of the nano-crystalline Ni-Ti (50.9 at.% Ni) shape memory alloy during short-term heat treatments
- Structural and mechanical stability of the nano-crystalline Ni-Ti (50.9 at.% Ni) shape memory alloy during short-term heat treatments (en)
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| skos:notation
| - RIV/60461373:22310/14:43898120!RIV15-GA0-22310___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
| |
| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/60461373:22310/14:43898120
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| http://linked.open...riv/jazykVysledku
| |
| http://linked.open.../riv/klicovaSlova
| - Biomedical applications; Microscopy various; Microstructure (as-cast. deformation-induced, recrystallization-induced); Heat treatment; Mechanical properties at ambient temperature; Nanostructured intermetallics (including preparation methods) (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - GB - Spojené království Velké Británie a Severního Irska
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| http://linked.open...ontrolniKodProRIV
| |
| http://linked.open...i/riv/nazevZdroje
| |
| http://linked.open...in/vavai/riv/obor
| |
| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
| |
| http://linked.open...UplatneniVysledku
| |
| http://linked.open...v/svazekPeriodika
| |
| http://linked.open...iv/tvurceVysledku
| - Marek, Ivo
- Vojtěch, Dalibor
- Dragounová, Lenka
- Michalcová, Alena
- Čapek, Jaroslav
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| http://linked.open...ain/vavai/riv/wos
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| issn
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| number of pages
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| http://bibframe.org/vocab/doi
| - 10.1016/j.intermet.2013.12.013
|
| http://localhost/t...ganizacniJednotka
| |
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