Tuning the magnetic properties of pure hafnium by high pressure torsion

Cepeda-Jiménez, C.M.; Beltrán, J. I.; Hernando, A.; García, M. A.; Ynduráin, Félix; Zhilyaev, Alexander P.; Pérez‐Prado, M.T.

doi:10.1016/j.actamat.2016.10.052

Cited by 15 publications

(11 citation statements)

References 37 publications

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“…Large tensile or compressive stress can result in phase transformations [47,48], or defect nucleation and fracture can happen under tensile stress above the strength limit of the considered medium [49]. The last two lines of Table 1 contain the information about extreme values of strain in multi-kink collisions.…”

Section: Discussionmentioning

confidence: 99%

Extreme values of elastic strain and energy in sine-Gordon multi-kink collisions

2018

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Abstract. In our recent study the maximal values of kinetic and potential energy densities that can be achieved in the collisions of N slow kinks in the sine-Gordon model were calculated analytically (for N = 1, 2, and 3) and numerically (for 4 ≤ N ≤ 7). However, for many physical applications it is important to know not only the total potential energy density but also its two components (the on-site potential energy density and the elastic strain energy density) as well as the extreme values of the elastic strain, tensile (positive) and compressive (negative). In the present study we give (i) the two components of the potential energy density and (ii) the extreme values of elastic strain. Our results suggest that in multisoliton collisions the main contribution to the potential energy density comes from the elastic strain, but not from the on-site potential. It is also found that tensile strain is usually larger than compressive strain in the core of multi-soliton collision.PACS. 05.45.Yv Solitons -11.10.Lm Nonlinear or nonlocal theories and models -45.50.Tn Collisions

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Section: Discussionmentioning

confidence: 99%

Extreme values of elastic strain and energy in sine-Gordon multi-kink collisions

2018

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“…Cepeda-Jimenez et al reported the effect of HPT on the magnetic property of the pure hafnium (Hf) (Cepeda-Jiménez et al, 2017). They reported the room temperature ferromagnetism occurrence in pure hafnium by SPD using HPT.…”

Section: General Idea On Severe Plastic Deformationmentioning

confidence: 99%

Assessment of Severe Plastic Deformation Processes in Bulk and Nanostructured Metallic Glass

et al. 2022

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The metallic glasses are known as amorphous and metastable materials. These materials have superior mechanical properties over crystalline materials with the same chemistry. Continuous efforts were made to improve the properties of metallic glass. The severe plastic deformation (SPD) method is used to improve the ductility of the glass. SPD causes the deformation at the atomic level in the disordered structure of the glass. Many methods are reported, such as cryogenic cycling, high-pressure torsion, and equal channel angular pressing, which are used for the SPD. In recent works on nanostructured metallic glasses, it has been evidenced that some properties, for example, mechanical, thermal, and magnetic, have improved compared to the bulk metallic glass. This paper has reviewed the recent progress in the SPD of the bulk and nanostructured metallic glasses. Different methods for the SPD have been addressed here. The effect of SPD on the properties of metallic glass is deliberated in this paper. Moreover, the challenging tasks of deformation occurrence in the glass and its characterization were considered, trying to develop a sound understanding of SPD in bulk and nanostructured metallic glasses.

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“…Crowdions can make a significant contribution to the mass transfer observed during severe plastic deformation (SPD) of metals and alloys. As it turned out, SPD, even at room temperature, can stimulate phase transformations occurring in the absence of deformation at much higher temperatures [51][52][53][54]. These phase transitions occur very quickly and are accompanied by accelerated mass transfer, which cannot be explained only by conventional mechanisms such as bulk and grain-boundary diffusion, even in the presence of an increased concentration of vacancies.…”

Section: Introductionmentioning

confidence: 99%

Effect of interatomic potentials on mass transfer by supersonic 2‑crowdions

et al. 2019

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An interstitial atom placed into a close-packed atomic row is called crowdion. Crowdions are very efficient in mass transfer in the crystal lattice since they are highly mobile, soliton-like objects. It has been demonstrated recently that single interstitial atom can move along a close-packed atomic row with a supersonic speed in two different modes, either as a classical 1-crowdion or as a 2-crowdion. The difference is that in the latter case two atoms move with a high speed at the same time, while in the former case only one atom has high speed. It has been shown that the 2-crowdion requires lesser energy to initiate mass transfer and it travels longer distance if it has same energy with the 1-crowdion. It is important to compare the efficiency of mass transfer by 2-crowdions in different materials. Materials have different properties because the interatomic interactions between various atoms are different. In the present study we demonstrate that the most important characteristic of the interatomic potentials, that has effect on the crowdion path length, is the energy of the interatomic bond at the distance between two atoms equal to a half of the equilibrium interatomic distance. This conclusion is justified by the condition of self-focusing propagation of supersonic crowdions, that is the collision velocity of the atoms should not exceed the value when they approach each other closer than half interatomic distance. As an example, mass transfer by 1-and 2-crowdions is considered in two-dimensional triangular lattice with Morse and Born-Mayer potentials.

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Tuning the magnetic properties of pure hafnium by high pressure torsion

Cited by 15 publications

References 37 publications

Extreme values of elastic strain and energy in sine-Gordon multi-kink collisions

Extreme values of elastic strain and energy in sine-Gordon multi-kink collisions

Assessment of Severe Plastic Deformation Processes in Bulk and Nanostructured Metallic Glass

Effect of interatomic potentials on mass transfer by supersonic 2‑crowdions

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