Fcc→bcc→hcp successive phase transformations in the strained ultrathin copper film: A molecular dynamic simulation study
Autor: | Bin Sun, Wei Guo, Liwei Mi, Jijiang Ren, Wenze Ouyang |
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Rok vydání: | 2019 |
Předmět: |
Materials science
Condensed matter physics Relaxation (NMR) chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Copper Transformation (music) 0104 chemical sciences Stress (mechanics) Molecular dynamics chemistry Martensite Phase (matter) Ultimate tensile strength General Materials Science 0210 nano-technology |
Zdroj: | Materials Chemistry and Physics. 223:171-182 |
ISSN: | 0254-0584 |
Popis: | The phase transformation behaviors of ultrathin Cu film under uniaxial tensile stress are investigated using molecular dynamic simulation. With the stress increasing, Cu film undergoes a successive phase transformation, i.e. firstly fcc→bcc, then bcc→hcp. The phase transformation process is very fast and thorough, i.e., all parents phase can transit into the new phase almost instantaneously. The crystallography mechanisms of two martensitic transformations are exactly corresponding to Bain and Burgers mechanism, respectively. By examining the formation conditions of such phase transformation in Cu film, we reveal that this fcc→bcc→hcp successive phase transformation will be subject to the very strict simulation conditions, namely stretching along [100] (or [010], [001])direction, definitive tensile speed (1 × 1010/s), appropriate film thickness (0.7230–18.08 nm), low temperature (T ≤ 10 K), and continuous stretching process without any relaxation procedure. |
Databáze: | OpenAIRE |
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