Strain Hardening in an AZ31 Alloy Submitted to Rotary Swaging

Trojanová, Zuzanka; Drozd, Zdeněk; Halmešová, Kristýna; Džugan, Ján; Škraban, Tomáš; Minárik, Peter; Németh, Gergely; Lukáč, P.

doi:10.3390/ma14010157

Cited by 13 publications

(11 citation statements)

References 50 publications

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“…It is obvious that the grain structure became homogeneous and the grain size became smaller. The average grain size of the swaged sample was calculated in the previous study to be ~16 μm [ 31 , 32 ]. Note that the presence of large non-recrystallised grains observed in the as-extruded state was completely suppressed by the rotary swaging process.…”

Section: Resultsmentioning

confidence: 99%

Fatigue in an AZ31 Alloy Subjected to Rotary Swaging

et al. 2022

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The magnesium AZ31 alloy was swaged with rotary pressure with the aim of redefining the microstructure and improving mechanical and fatigue properties. The rotary swaging process and subsequent ageing improved the yield stress in tension and compression. In the present study, the investigation was focused on fatigue behaviour. The samples were cycled in a symmetric regime with a frequency of 35 Hz. A dependence of the stress amplitude on the number of cycles up to the fracture was estimated. The microstructure of the samples and fracture surfaces was analysed with a scanning electron microscope. The fatigue process was influenced by the pronounced texture formed in the swaging process. The fatigue properties of the swaged samples improved substantially—the endurance limit based on 107 cycles was approximately 120 MPa—compared to those of the cast alloy. The analysis of the fracture surfaces showed a transcrystalline fatigue fracture.

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Section: Resultsmentioning

confidence: 99%

Fatigue in an AZ31 Alloy Subjected to Rotary Swaging

et al. 2022

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“…Besides being impenetrable, the dislocation obstacles may be situated in the slip plane. These dislocation obstacles may arise in dislocation reactions [30].…”

Section: Mg and Mg4li Composites (α Phase)mentioning

confidence: 99%

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg–Li Metal-Matrix Composites

Trojanová

Drozd

Lukáč

et al. 2021

Metals

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Stress-relaxation tests were performed during plastic deformation at room temperature of three magnesium Mg–Li alloys reinforced with 10 vol% of short Saffil fibers. For comparison, the composite with the Mg matrix was studied. The time dependencies of the stress decrease were analyzed with the aim to determine the activation volume and the main types of thermally activated processes occurring during plastic flow. The Mg4Li matrix alloy exhibited the hcp structure, while the composite with the Mg12Li matrix alloy had the bcc structure. The third alloy, Mg8Li, combined both phases, hcp and bcc. The stress acting in the matrix was divided into two components: the internal stress and the effective stress. Activation volume and stress-sensitivity parameters were determined as a function of effective stress and strain. While the values of the activation volume depending on the effective stress lay on one “master” curve, the strain dependence was different for all materials. The main thermally activated process in the hcp structure was the dislocation motion in the noncompact planes, while in the bcc structure, massive recovery processes connected with an increase in dislocations were identified.

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“…RS is an incremental forming process utilized to reduce cross sections of bar, tubes, wires and other cylindrical workpieces [37][38][39], which is schematically depicted in Figure 3a. Set of dies (generally two to eight) perform short, high-frequency (from 6800 to 12,000 times per minute), simultaneous radial movements and apply compressive force onto the enclosed workpiece.…”

Section: Rotary Swaging 21 Theory Of Rotary Swagingmentioning

confidence: 99%

“…Set of dies (generally two to eight) perform short, high-frequency (from 6800 to 12,000 times per minute), simultaneous radial movements and apply compressive force onto the enclosed workpiece. With every hammering of the die, the workpiece begins to flow and is formed with well precision [ 39 ]. Relatively wide strain rate from several to hundreds is controllable by suitable parameters, involving hammer speed, feed speed and the amount of reduction [ 40 , 41 ].…”

Section: Rotary Swagingmentioning

confidence: 99%

Nano-Gradient Materials Prepared by Rotary Swaging

Chen

Zhao

2021

Nanomaterials

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Gradient nanostructured metallic materials with a nanostructured surface layer show immense potential for various industrial applications because of their outstanding mechanical, fatigue, corrosion, tribological properties, etc. In the past several decades, various methods for fabricating gradient nanostructure have been developed. Nevertheless, the thickness of gradient microstructure is still in the micrometer scale due to the limitation of preparation techniques. As a traditional but potential technology, rotary swaging (RS) allows gradient stress and strain to be distributed across the radial direction of a bulk cylindrical workpiece. Therefore, in this review paper, we have systematically summarized gradient and even nano-gradient materials prepared by RS. We found that metals processed by RS usually possess inverse nano-gradient, i.e., nano-grains appear in the sample center, texture-gradient and dislocation density-gradient along the radial direction. Moreover, a broad gradient structure is distributed from center to edge of the whole processed rods. In addition, properties including micro-hardness, conductivity, corrosion, etc., of RS processed metals are also reviewed and discussed. Finally, we look forward to the future prospects and further research work for the RS processed materials.

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Strain Hardening in an AZ31 Alloy Submitted to Rotary Swaging

Cited by 13 publications

References 50 publications

Fatigue in an AZ31 Alloy Subjected to Rotary Swaging

Fatigue in an AZ31 Alloy Subjected to Rotary Swaging

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg–Li Metal-Matrix Composites

Nano-Gradient Materials Prepared by Rotary Swaging

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