Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> Permanent Magnets: First Level of Heterogeneity
An original vision for the structural formation of (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> alloys, the compositions of which show promise for manufacturing high-coercivity permanent magnets, is reported. Foundations arising from the quantitative analysis of alloy microstructures as the first, coar...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-09-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/13/17/3893 |
| _version_ | 1797554739637911552 |
|---|---|
| author | Andrey G. Dormidontov Natalia B. Kolchugina Nikolay A. Dormidontov Yury V. Milov |
| author_facet | Andrey G. Dormidontov Natalia B. Kolchugina Nikolay A. Dormidontov Yury V. Milov |
| author_sort | Andrey G. Dormidontov |
| collection | DOAJ |
| description | An original vision for the structural formation of (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> alloys, the compositions of which show promise for manufacturing high-coercivity permanent magnets, is reported. Foundations arising from the quantitative analysis of alloy microstructures as the first, coarse, level of heterogeneity are considered. The structure of the alloys, in optical resolutions, is shown to be characterized by three structural phase components, which are denoted as A, B, and C and based on the 1:5, 2:17, and 2:7 phases, respectively. As the chemical composition of alloys changes monotonically, the quantitative relationships of the components A, B, and C vary over wide ranges. In this case, the hysteretic properties of the (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> alloys in the high-coercivity state are strictly controlled by the volume fractions of the A and B structural components. Based on quantitative relationships of the A, B, and C structural components for the (R,Zr)(Co,Cu,Fe)<sub>Z</sub> alloys with R = Gd or Sm, sketches of quasi-ternary sections of the (Co,Cu,Fe)-R-Zr phase diagrams at temperatures of 1160–1190 °C and isopleths for the 2:17–2:7 phase composition range of the (Co,Cu,Fe)–Sm–Zr system were constructed. |
| first_indexed | 2024-03-10T16:36:20Z |
| format | Article |
| id | doaj.art-e119fd0f9f504d4288ed1fb2899fb1cc |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T16:36:20Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-e119fd0f9f504d4288ed1fb2899fb1cc2023-11-20T12:25:51ZengMDPI AGMaterials1996-19442020-09-011317389310.3390/ma13173893Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> Permanent Magnets: First Level of HeterogeneityAndrey G. Dormidontov0Natalia B. Kolchugina1Nikolay A. Dormidontov2Yury V. Milov3LLC “MEM”, Moscow 123458, RussiaLLC “MEM”, Moscow 123458, RussiaLLC “MEM”, Moscow 123458, RussiaLLC “MEM”, Moscow 123458, RussiaAn original vision for the structural formation of (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> alloys, the compositions of which show promise for manufacturing high-coercivity permanent magnets, is reported. Foundations arising from the quantitative analysis of alloy microstructures as the first, coarse, level of heterogeneity are considered. The structure of the alloys, in optical resolutions, is shown to be characterized by three structural phase components, which are denoted as A, B, and C and based on the 1:5, 2:17, and 2:7 phases, respectively. As the chemical composition of alloys changes monotonically, the quantitative relationships of the components A, B, and C vary over wide ranges. In this case, the hysteretic properties of the (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> alloys in the high-coercivity state are strictly controlled by the volume fractions of the A and B structural components. Based on quantitative relationships of the A, B, and C structural components for the (R,Zr)(Co,Cu,Fe)<sub>Z</sub> alloys with R = Gd or Sm, sketches of quasi-ternary sections of the (Co,Cu,Fe)-R-Zr phase diagrams at temperatures of 1160–1190 °C and isopleths for the 2:17–2:7 phase composition range of the (Co,Cu,Fe)–Sm–Zr system were constructed.https://www.mdpi.com/1996-1944/13/17/3893Sm–Co permanent magnet alloyshighly coercive structurescomposition-structure-properties diagrams(Co,Cu,Fe)–R–Zr phase diagrams sketches |
| spellingShingle | Andrey G. Dormidontov Natalia B. Kolchugina Nikolay A. Dormidontov Yury V. Milov Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> Permanent Magnets: First Level of Heterogeneity Materials Sm–Co permanent magnet alloys highly coercive structures composition-structure-properties diagrams (Co,Cu,Fe)–R–Zr phase diagrams sketches |
| title | Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> Permanent Magnets: First Level of Heterogeneity |
| title_full | Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> Permanent Magnets: First Level of Heterogeneity |
| title_fullStr | Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> Permanent Magnets: First Level of Heterogeneity |
| title_full_unstemmed | Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> Permanent Magnets: First Level of Heterogeneity |
| title_short | Structure of Alloys for (Sm,Zr)(Co,Cu,Fe)<sub>Z</sub> Permanent Magnets: First Level of Heterogeneity |
| title_sort | structure of alloys for sm zr co cu fe sub z sub permanent magnets first level of heterogeneity |
| topic | Sm–Co permanent magnet alloys highly coercive structures composition-structure-properties diagrams (Co,Cu,Fe)–R–Zr phase diagrams sketches |
| url | https://www.mdpi.com/1996-1944/13/17/3893 |
| work_keys_str_mv | AT andreygdormidontov structureofalloysforsmzrcocufesubzsubpermanentmagnetsfirstlevelofheterogeneity AT nataliabkolchugina structureofalloysforsmzrcocufesubzsubpermanentmagnetsfirstlevelofheterogeneity AT nikolayadormidontov structureofalloysforsmzrcocufesubzsubpermanentmagnetsfirstlevelofheterogeneity AT yuryvmilov structureofalloysforsmzrcocufesubzsubpermanentmagnetsfirstlevelofheterogeneity |