Intermixing of Fe and Cu on the atomic scale by high-pressure torsion as revealed by DC- and AC-SQUID susceptometry and atom probe tomography

Stückler, Martin; Krenn, H.; Kürnsteiner, Philipp; Gault, Baptiste; Geuser, F. de; Weissitsch, Lukas; Wurster, Stefan; Pippan, Reinhard; Bachmaier, Andrea

doi:10.1016/j.actamat.2020.06.035

Cited by 14 publications

(12 citation statements)

References 44 publications

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“…The disks were processed by a conventional quasi-constrained HPT facility with Bridgman-anvils (6 mm diameter, 0.6 mm total depth). Details of this experimental setup can be found in [27][28][29]. In order to avoid slipping, the samples were sand blasted to increase the friction between the anvils and the disk.…”

Section: Sample Processingmentioning

confidence: 99%

Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

Duan

Reiberg

Kutleša

et al. 2021

Continuum Mech. Thermodyn.

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An equiatomic MoNbTaTiVZr refractory high-entropy alloy (HEA) produced by arc melting was processed by high-pressure torsion (HPT) at room temperature. Thermodynamic calculations and experimental results indicated a dual-phase microstructure composed of about 85% BCC Zr-depleted and 15% BCC Zr-rich phase in the as-cast condition. HPT causes grain refinement and an increase in dislocation density without the formation of new phases. After four revolutions, the Zr-depleted phase was hardened to $$\sim $$ ∼ 540 HV, while the Zr-rich phase exhibited softening with a decrease in hardness to $$\sim $$ ∼ 480 HV. The occurrence of a vortex-like microstructure and the analysis of elemental concentrations indicated a shear-induced mechanical homogenization, which was supposed to be the cause of the observed softening.

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Section: Sample Processingmentioning

confidence: 99%

Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

Duan

Reiberg

Kutleša

et al. 2021

Continuum Mech. Thermodyn.

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“…[104] APT and TEM investigations clearly show that a homogeneous Cu and Co concentration is obtained even in nm regions. [106,107] Paramagnetic features for Co contents less than 50 wt. % (Figure 5a) and a decrease of the magnetic moment per Co-atom with Cu-content, which might originate from Ruderman-Kittel-Kasuya-Yosida-interaction, were observed with superconducting quantum interference device (SQUID) hysteresis measurements.…”

Section: Hpt-deformation Of Powders To Obtain Soft Magnetic Materialsmentioning

confidence: 99%

Magnetic Materials via High-Pressure Torsion of Powders

et al. 2023

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Magnets are key materials for the electrification of mobility and also for the generation and transformation of electric energy. Research and development in recent decades lead to high performance magnets, which require a finely tuned microstructure to serve applications with ever increasing requirements. Besides optimizing already known materials and the search on novel material combinations, an increasing interest in unconventional processing techniques and the utilization of magnetic concepts is apparent. Severe plastic deformation (SPD), in particular by high-pressure torsion (HPT) is a versatile and suitable method to manufacture microstructures not attained so far, but entitling different magnetic coupling mechanisms fostering magnetic properties. In this work, we review recent achievements obtained by HPT on soft and hard magnetic materials, focusing on powder as starting materials. Furthermore, we give specific attention to the formation of magnetic composites and highlight the opportunities of powder starting materials for HPT to exploit magnetic interaction mechanism.

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“…Besides grain size refinement, HPT can also be employed to produce immiscible alloys. The immiscible Fe-Cu system was prepared by HPT from high purity Fe and Cu powders [ 22 , 35 ]. In the as-deformed states, Fe exists in the form of clusters and diluted state in the fcc-Cu matrix.…”

Section: Application Of Hpt To Binary Magnetic Alloysmentioning

confidence: 99%

A Review of Ultrafine-Grained Magnetic Materials Prepared by Using High-Pressure Torsion Method

et al. 2022

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High-pressure torsion (HPT) is a severe plastic deformation technique where a sample is subjected to torsional shear straining under a high hydrostatic pressure. The HPT method is usually employed to create ultrafine-grained nano-structures, making it widely used in processing many kinds of materials such as metals, glasses, biological materials, and organic compounds. Most of the published HPT results have been focused on the microstructural development of non-magnetic materials and their influence on the mechanical properties. The HPT processing of magnetic materials and its influence on the structural and magnetic properties have attracted increasing research interest recently. This review describes the application of HPT to magnetic materials and our recent experimental results on Mn3O4, Mn4N, and MnAl-based alloys. After HPT, most magnetic materials exhibit significantly reduced grain size and substantially enhanced coercivity.

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Intermixing of Fe and Cu on the atomic scale by high-pressure torsion as revealed by DC- and AC-SQUID susceptometry and atom probe tomography

Cited by 14 publications

References 44 publications

Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

Strain-hardening properties of the high-entropy alloy MoNbTaTiVZr processed by high-pressure torsion

Magnetic Materials via High-Pressure Torsion of Powders

A Review of Ultrafine-Grained Magnetic Materials Prepared by Using High-Pressure Torsion Method

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