Abstract
Tetrataenite (L10-FeNi) is a promising candidate for use as a permanent magnet free of rare-earth elements because of its favorable properties such as high magnetic anisotropy and coercivity. We report on structural properties of Fe49Ni49Ti2 alloy after severe plastic deformation (SPD) by high pressure torsion (HPT) technique. The main magnetic and structural characteristics of bulk and HPT materials were determined. As a result of plastic deformation, all samples were obtained with high concentration of defects and stressed state. Low-temperature annealing was used to accelerate the kinetics of phase formation and the possible appearance of nuclei of a stable chemically ordered L10 phase of tetrataenite. Our research shows that it is premature to talk about the formation of even a small amount of phase L10. Additional research needs to be done.
Highlights
In the last few years, it has been shown that severe plastic deformation (SPD) is a technique that is suitable for processing large quantities of clean and fully dense microstructures of small size.1–3 Nowadays there are many works that the results of studies on the change in mechanical properties with various combinations of SPD and subsequent annealing are reported.4,5High pressure torsion (HPT) is one of the main SPD methods
We report on structural properties of Fe49Ni49Ti2 alloy after severe plastic deformation (SPD) by high pressure torsion (HPT) technique
It is possible to accelerate the kinetics of the process as follows: first, make very small particles so that there are a lot of grain boundaries, broken bonds of the material, and start the annealing process at temperatures below the temperature of the phase transition ordered phase-disordered phase
Summary
In the last few years, it has been shown that severe plastic deformation (SPD) is a technique that is suitable for processing large quantities of clean and fully dense microstructures of small size. Nowadays there are many works that the results of studies on the change in mechanical properties with various combinations of SPD and subsequent annealing are reported.. Nowadays there are many works that the results of studies on the change in mechanical properties with various combinations of SPD and subsequent annealing are reported.. Structural defects can lead to a sharp increase in the mobility of atoms inside a substance and an acceleration of the process of diffusion of atoms, which can lead to the formation of new, previously unknown phases. An example is the Fe50Ni50 tetrataenite phase observed in some metal and stone meteorites.. An L10-ordered FeNi tetrataenite is a natural rare-earth free permanent magnet. The successful synthesis of tetrataenite is reported in works of Néel, Shima, etc.. Magnetic domain structure was measured by atomic-force microscopy (Aist-NT Smart SPM1000) with using standard commercially available CoCr covered tips. Fe49Ni49Ti2 alloy after SPD by HPT technique and low temperature annealing
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