Crystallization process and kinetics of SmCo/Fe and SmCo/FeCo partially crystallized amorphous alloys
Source abstract
Abstract
Abstract Partially crystallized amorphous alloys SmCo/Fe and SmCo/FeCo with nanocrystalline α-Fe and α-(Fe,Co) grains distributed in the amorphous SmCo matrix were synthesized by mechanical alloying of a mixture of SmCo5 and α-Fe and FeCo powders. The crystallization process and kinetics of these amorphous alloys upon annealing have been investigated. For SmCo/Fe amorphous alloy, with the increase of the annealing temperature to 700 °C, a SmCo5 phase and a SmCo7 phase precipitate in sequence then the SmCo5 transforms to SmCo7. The activation energies for the SmCo5 and SmCo7 crystallization are 2.5 ± 0.1 and 2.8 ± 0.1 eV, respectively. Differently, the SmCo/FeCo amorphous alloy processes only one phase transformation to SmCo7 with an activation energy of 2.8 ± 0.1 eV after annealing to 700 °C. The present study gives an insight into the phase transformation of the SmCo amorphous alloys with different soft phase and is of basic significance to the microstructure controlling of the SmCo based nanocomposite magnets.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic Properties of Alloys · Rare-earth and actinide compounds · Metallic Glasses and Amorphous Alloys
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (30)
Show source-provided references
1. Meltspun permanent magnet materials containing Fe3B as the main phase10.1016/0304-8853(89)90333-8 ↗
2. The exchange-spring magnet: a new material principle for permanent magnets10.1109/20.102931 ↗
3. Giant energy product in nanostructured two-phase magnets10.1103/PhysRevB.48.15812 ↗
4. Materials science: the pull of stronger magnets10.1038/472022a ↗
5. Applied physics: strong magnets by self-assembly10.1038/420374a ↗
6. Magnetic materials and devices for the 21st century: stronger, lighter, and more energy efficient10.1002/adma.201002180 ↗
7. Controllable nanocrystallization in amorphous Nd9Fe85B6 via combined application of severe plastic deformation and thermal annealing10.1063/1.2768023 ↗
8. Development of crystal texture in Nd-lean amorphous Nd9Fe85B6 under hot deformation10.1063/1.3126444 ↗
9. Study of interface structure of α-Fe/Nd2Fe14B nanocomposite magnets10.1063/1.1456950 ↗
10. Simultaneously increasing the magnetization and coercivity of bulk nanocomposite magnets via severe plastic deformation10.1063/1.4824032 ↗
11. Advances in nanostructured permanent magnets research10.1088/0022-3727/46/4/043001 ↗
12. Bulk SmCo5/α-Fe nanocomposite permanent magnets fabricated by mould-free Jouleheating compaction10.1063/1.3563098 ↗
13. Effect of thermal fluctuations on the recoil loops of SmCo5/Fe nanocomposite system10.1063/1.3067850 ↗
14. Structure and magnetic properties of bulk anisotropic SmCo5/α-Fe nanocomposite permanent magnets prepared via a bottom up approach10.1016/j.jallcom.2012.05.079 ↗
15. Influence of mechanical milling on the physical properties of SmCo5/Fe65Co35 type hard/soft magnetic nanocomposite10.1016/j.jallcom.2013.01.140 ↗
16. Deformation-induced texture in nanocrystalline 2:17, 1:5 and 2:7 Sm–Co magnets10.1016/j.jmmm.2009.06.011 ↗
17. Spark plasma sintered Sm2Co17–FeCo nanocomposite permanent magnets synthesized by high energy ball milling10.1088/0957-4484/19/33/335701 ↗
18. Effects of Zr, Nb, and Cu substitutions on magnetic properties of melt-spun and hot deformed bulk anisotropic nanocomposite SmCo type magnets10.1063/1.2831334 ↗
19. Fabrication of bulk nanocomposite magnets via severe plastic deformation and warm compaction10.1063/1.3358390 ↗
20. Metastable phases in rare-earth permanent-magnet materials10.1088/0022-3727/33/22/201 ↗
21. Crystallization kinetics and phase transition under high-pressure of amorphous Sm8Fe85Si2C5 alloy10.1016/S1359-6454(01)00303-2 ↗
22. Crystallization kinetics of amorphous Sm8Fe85Si2C5 alloy10.1063/1.1330769 ↗
23. Kinetical analysis of the heat treatment procedure in SmCo5 and other rare-earth transition-metal sintered magnets10.1016/j.jallcom.2004.02.002 ↗
24. Kinetic studies of hydrogen desorption in SmCo 2/17-type sintered magnets10.1016/j.tca.2008.12.021 ↗
25. Crystallization and magnetic hardening of SmCo thin films10.1016/j.jnoncrysol.2006.12.040 ↗
26. X-ray line broadening from filed aluminium and wolfram10.1016/0001-6160(53)90006-6 ↗
27. Reaction kinetics in differential thermal analysis10.1021/ac60131a045 ↗
28. Kinetic analysis of derivative curves in thermal analysis10.1007/BF01911411 ↗
29. Microstructure and intergranular diffusion in exchange-coupled Sm–Co/Fe nanocomposites10.1063/1.3467202 ↗
30. A structural investigation of SmCo5/Fe nanostructured alloys obtained by high-energy ball milling and subsequent annealing10.1088/0022-3727/43/8/085001 ↗