Cooperative strain accommodation over grains in martensitic transformation from Fe-Ni nanocrystalline austenite
| Autor: | Akinobu Shibata, Fumitaka Ichikawa, Nobuhiro Tsuji, Tohru Yamasaki, Hiroki Adachi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Austenite Materials science Bainite Metallurgy Alloy 02 engineering and technology Lath engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nanocrystalline material Transmission electron microscopy Martensite Diffusionless transformation 0103 physical sciences engineering 0210 nano-technology |
| Zdroj: | Philosophical Magazine Letters. 97:132-139 |
| ISSN: | 1362-3036 0950-0839 |
| Popis: | This paper reports an investigation of martensitic transformation behaviour from austenite with various grain sizes ranging from 290 nm to 34 μm in an Fe–Ni alloy fabricated by electrodeposition and subsequent heat treatment. We confirmed that martensite morphology changed from lath to thin plate with decreasing the austenite grain size. Crystallographic orientation analysis revealed that the variants of thin plate martensite formed in the austenite with relatively coarse grains achieved self-accommodation of the transformation strain inside one austenite grain. In contrast, the transformation strain accompanying martensitic transformation from the ultrafine-grained or nanocrystalline austenite was not accommodated by the martensite variants formed in one austenite grain but accommodated cooperatively by those formed in the several adjacent austenite grains. |
| Databáze: | OpenAIRE |
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