Accumulative fold-forging (AFF) as a novel severe plastic deformation process to fabricate a high strength ultra-fine grained layered aluminum alloy structure

Khodabakhshi, F.; Gerlich, A.P.

doi:10.1016/j.matchar.2017.12.023

Cited by 29 publications

(5 citation statements)

References 44 publications

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“…It is also observed that some deformation fields are generated due to the anisotropy which is probably a result of the elongated grain structures observed in Fig. 3 (a), indicating that the indentation resistance is greater along the fine dimension of the grains, perpendicular to the forging direction [15]. However, there is enough evidence which indicates that the refinement of grain observed in the grain size distribution shown in Fig.…”

Section: St Step 2 Nd Stepmentioning

confidence: 84%

Novel Method of Severe Plastic Deformation - Continuous Closed Die Forging: CP Aluminum Case Study

Zhilyaev

Rodríguez

Calvo

et al. 2018

DDF

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There is a large number of methods for severe plastic deformation (SPD). Multidirectional forging (MDF) is probably one of the most easily scalable for industrial application. In general, two main conditions need to be fulfilled for successful SPD processing: constant sample geometry and application of a quasi-hydrostatic pressure. The first condition is necessary for strain accumulation by repetitive deformation and the second one helps preventing cracking in the specimens with high accumulated strain. However, MDF is not providing quasi-hydrostatic condition in the processed sample. This paper reports a novel method for severe plastic deformation, namely continuous closed die forging (CCDF), which fulfils both requirements for the successful deformation of samples to a very high accumulated strain. Commercially pure aluminum (1050) was processed to a total strain of 24 by CCDF. After processing, the microstructure was refined down to a mean grain size of 0.78 μm. Tensile testing showed good mechanical properties: yield strength and ultimate tensile strength of the ultrafine-grained aluminum were 180 and 226 MPa, respectively. Elongation to rupture was about 18%. The microstructure, microhardness and grain boundary statistics are discussed with regard to the high mechanical properties of the UFG aluminum processed by this novel method.

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Section: St Step 2 Nd Stepmentioning

confidence: 84%

Novel Method of Severe Plastic Deformation - Continuous Closed Die Forging: CP Aluminum Case Study

Zhilyaev

Rodríguez

Calvo

et al. 2018

DDF

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“…Depending on the type of the process, some of the peaks faded away, such as the {220} peak which disappeared after ECAP and faded after HPTE. Peak broadening of the patterns which is caused by grain refinement [20,21] can be observed in the diffractogram of processed samples (Fig. 2-a).…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Hydrogen Storage in Metals by Using a New Technique in Severe Plastic Deformations

Omranpour

Kommel

García-Sánchez

et al. 2019

KEM

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Hydrogen is expected to be a viable solution for green-energy investment in future. However, hydrogen storage is a big challenge for stationary and mobile applications. Severe Plastic Deformation (SPD) techniques are well-known to be effective in enhancement of hydrogenation in metals hydrides. This paper shows the effect of a novel SPD technique named “High Pressure Torsion Extrusion-HPTE” on the hydrogenation of metal hydrides and compare it with the conventional method of ECAP. Results of mechanical testing and X-ray diffraction patterns showed significant enhancement in hardness and microstructural refinement in materials after HPTE. Accordingly, hydrogenation kinetics improved dramatically. This achievement could be an initiative to implement HPTE in synthesis of metal hydrides for clean energy applications.

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“…A very recently developed advanced SPD method called accumulative fold-forging (AFF) 110) was applied to produce nanostructured MgNi layers with enhanced hydrogen storage capacity. 111) The basic concept of this technique is to involve repetitive stacking and forging of metallic layers, as illustrated schematically through Figs.…”

Section: Accumulative Fold-forgingmentioning

confidence: 99%

“…On one hand, the (002) direction presents atomic positions with lower energy for the hydrogen atoms to enter the Mg matrix than other directions. On the other hand, there is an orientation relationship Mg(002)//MgH 2 (110) and this transformation is assisted by the large amount of (002) texture. However, it is not only the texture that determines the sorption properties but also the grain size as pointed out in Ref.…”

Section: Comparison Of the Different Spd Techniquesmentioning

confidence: 99%

The Effect of Severe Plastic Deformation on the Hydrogen Storage Properties of Metal Hydrides

Révész

Gajdics

2023

Mater. Trans.

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Solid-state hydrogen storage in various metal hydrides is among the most promising and clean way of storing energy, however, some problems, such as sluggish kinetics and high dehydrogenation temperature should be dealt with. In the present paper the advances of severe plastic deformation on the hydrogenation performance of metal hydrides will be reviewed. Techniques, like high-pressure torsion, equal-channel angular pressing, cold rolling, fast forging and surface modification have been widely applied to induce lattice defects, nanocrystallization and the formation of abundant grain boundaries in bulk samples and they have the potential to up-scale material production. These plastically deformed materials exhibit not only better H-sorption properties than their undeformed counterparts, but they possess better cycling performance, especially when catalysts are mixed with the host alloy promoting potential future applications.

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Accumulative fold-forging (AFF) as a novel severe plastic deformation process to fabricate a high strength ultra-fine grained layered aluminum alloy structure

Abstract: fold-forging (AFF) as a novel severe plastic deformation process to fabricate a high strength ultrafine grained layered aluminum alloy structure. The address for the corresponding author was captured as affiliation for all authors. Please check if appropriate. Mtl(2017),

Cited by 29 publications

References 44 publications

Novel Method of Severe Plastic Deformation - Continuous Closed Die Forging: CP Aluminum Case Study

Novel Method of Severe Plastic Deformation - Continuous Closed Die Forging: CP Aluminum Case Study

Enhancement of Hydrogen Storage in Metals by Using a New Technique in Severe Plastic Deformations

The Effect of Severe Plastic Deformation on the Hydrogen Storage Properties of Metal Hydrides

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