Adabifiroozjaei, Esmaeil ; Maccari, Fernando ; Schäfer, Lukas ; Jiang, Tianshu ; Recalde-Benitez, Oscar ; Chirkova, Alisa ; Shayanfar, Navid ; Dirba, Imants ; Kani, Nagaarjhuna A ; Shuleshova, Olga ; Winkler, Robert ; Zintler, Alexander ; Rao, Ziyuan ; Pfeuffer, Lukas ; Kovács, András ; Dunin-Borkowski, Rafal E. ; Skokov, Konstantin P. ; Gault, Baptiste ; Gruner, Markus ; Gutfleisch, Oliver ; Molina-Luna, Leopoldo (2024)
Martensitic phase transformation in short-range ordered Fe50Rh50 system induced by thermal stress and mechanical deformation.
In: Acta Materialia, 264
doi: 10.1016/j.actamat.2023.119577
Article, Bibliographie
Abstract
Metallic/intermetallic materials with BCC structures hold an intrinsic instability due to phonon softening along [110] direction, causing BCC to lower-symmetry phases transformation when the BCC structures are thermally or mechanically stressed. Fe50Rh50 binary system is one of the exceptional BCC structures (ordered-B2) that has not been yet showing such transformation upon application of thermal stress, although mechanical deformation results in B2 to disordered FCC (γ) and L10 phases transformation. Here, a comprehensive transmission electron microscopy (TEM) study is conducted on thermally-stressed samples of Fe50Rh50 induced by quenching in water and liquid nitrogen from 1150°C and 1250°C. We demonstrated that samples quenched from 1150°C into water and liquid nitrogen show the presence of 1/4{110} and 1/2{110} satellite reflections, the latter of which is expected from phonon dispersion curves obtained by density functional theory calculation. Therefore, it is proposed that Fe50Rh50 maintains the B2 structure that is in premartensite state. Once Fe50Rh50 is quenched from 1250°C into liquid nitrogen, formation of two short-range ordered tetragonal phases with various c/a ratios (∼1.15 and 1.4) is observed in line with phases formed from mechanically deformed (30%) sample. According to our observations, an accurate atomistic shear model ({110}<1-10>) is presented that describes the martensitic transformation of B2 to these tetragonal phases.
| Item Type: | Article |
|---|---|
| Erschienen: | 2024 |
| Creators: | Adabifiroozjaei, Esmaeil ; Maccari, Fernando ; Schäfer, Lukas ; Jiang, Tianshu ; Recalde-Benitez, Oscar ; Chirkova, Alisa ; Shayanfar, Navid ; Dirba, Imants ; Kani, Nagaarjhuna A ; Shuleshova, Olga ; Winkler, Robert ; Zintler, Alexander ; Rao, Ziyuan ; Pfeuffer, Lukas ; Kovács, András ; Dunin-Borkowski, Rafal E. ; Skokov, Konstantin P. ; Gault, Baptiste ; Gruner, Markus ; Gutfleisch, Oliver ; Molina-Luna, Leopoldo |
| Type of entry: | Bibliographie |
| Title: | Martensitic phase transformation in short-range ordered Fe50Rh50 system induced by thermal stress and mechanical deformation |
| Language: | English |
| Date: | 1 January 2024 |
| Place of Publication: | Amsterdam |
| Publisher: | Elsevier |
| Journal or Publication Title: | Acta Materialia |
| Volume of the journal: | 264 |
| DOI: | 10.1016/j.actamat.2023.119577 |
| Abstract: | Metallic/intermetallic materials with BCC structures hold an intrinsic instability due to phonon softening along [110] direction, causing BCC to lower-symmetry phases transformation when the BCC structures are thermally or mechanically stressed. Fe50Rh50 binary system is one of the exceptional BCC structures (ordered-B2) that has not been yet showing such transformation upon application of thermal stress, although mechanical deformation results in B2 to disordered FCC (γ) and L10 phases transformation. Here, a comprehensive transmission electron microscopy (TEM) study is conducted on thermally-stressed samples of Fe50Rh50 induced by quenching in water and liquid nitrogen from 1150°C and 1250°C. We demonstrated that samples quenched from 1150°C into water and liquid nitrogen show the presence of 1/4{110} and 1/2{110} satellite reflections, the latter of which is expected from phonon dispersion curves obtained by density functional theory calculation. Therefore, it is proposed that Fe50Rh50 maintains the B2 structure that is in premartensite state. Once Fe50Rh50 is quenched from 1250°C into liquid nitrogen, formation of two short-range ordered tetragonal phases with various c/a ratios (∼1.15 and 1.4) is observed in line with phases formed from mechanically deformed (30%) sample. According to our observations, an accurate atomistic shear model ({110}<1-10>) is presented that describes the martensitic transformation of B2 to these tetragonal phases. |
| Additional Information: | Arikel-ID: 119577 |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Advanced Electron Microscopy (aem) 11 Department of Materials and Earth Sciences > Material Science > Functional Materials |
| Date Deposited: | 08 Dec 2023 12:22 |
| Last Modified: | 02 May 2024 06:48 |
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