Numerical and experimental studies of the plastic strains distribution using subsequent direct extrusion after three twist extrusion passes

Mousavi, S.A.A. Akbari; Bahadori, Sh. Ranjbar; Shahab, A.R.

doi:10.1016/j.msea.2010.02.077

Cited by 31 publications

(6 citation statements)

References 9 publications

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“…To compare the deformation behavior of LTE and NLTE processes, two typical elements of specimen were chosen at the inner and the outer sections of workpieces distinctively (see e.g., [25,26] for similar representation). The selected elements are highlighted in Figure 5.…”

Section: Resultsmentioning

confidence: 99%

Numerical Analysis of a New Nonlinear Twist Extrusion Process

Yalçınkaya

Şimşek

Miyamoto

et al. 2019

Metals

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Severe plastic deformation (SPD) can produce ultrafine grained (UFG) and nanocrystalline (NC) materials by imposing intense plastic strain. One of the many options for inducing large plastic strains is to pass the material through a torsional/twist extrusion. The high-strength materials fabricated by SPD has no limit in dimension, and they can even be applied to load-carrying structural materials. Even though the method is quite successful, the industrial transfer has been limited so far because of low production efficiency and high cost. To remedy such difficulties, a new torsional extrusion process called nonlinear twist extrusion (NLTE) is introduced in this study, which has been designed based on two principles; (1) linear arrangement of the production line and (2) effective die geometry resulting in higher and more homogeneous plastic strain evolution which would give better grain refinement. The initial computational study of the designed geometry for the new extrusion process is addressed in the current study. The obtained results are discussed in detail with respect to conventional extrusion process, which is referred to as linear twist extrusion (LTE). The method is expected to offer a great potential for industrial use.

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Section: Resultsmentioning

confidence: 99%

Numerical Analysis of a New Nonlinear Twist Extrusion Process

Yalçınkaya

Şimşek

Miyamoto

et al. 2019

Metals

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“…The numbers of passes were selected based on the previous reported results. 16,23 The experimental design matrix and experimental results are presented in Table 4. According to the experimental plan, a total of 20 experiments were conducted with three various values of input process variables A, B and C. Two repetitions of experiments per alignment were conducted and the average values of the output parameters are displayed in Table 4.…”

Section: Development Of Mathematical Modelmentioning

confidence: 99%

Modeling of twist extrusion process parameters of AA6082-T6 alloy by response surface approach

Iqbal¹,

Kumar

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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The fabrication of nanostructure materials using severe plastic deformation techniques with improved properties has received attention over the recent years. Twist extrusion has become one of the most widely spread techniques of the severe plastic deformation processes. This article reports the experimental investigations on the twist extrusion forming of AA6082-T6 aluminum alloy. The central composite design was utilized to plan the experiments, and response surface methodology was employed for developing experimental models. The forming load, temperature and number of passes were considered as input parameters in this study. The process performances such as tensile strength and hardness were evaluated. The results of analysis of variance indicated that the proposed mathematical models obtained can effectively describe the performances within the limits of factors being studied. The experimental values were in good agreement with the predicted values.

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“…Aqueous microgel dispersions can produce H • , OH • , and perhaps also other organic radicals by the irradiation of UV, which can reduce metal ions into metal atoms [26]. In the top-down method, a metal nanoparticle is initially synthesized which is then treated with extra ligands or metal ions to form nanocrystals [27][28][29][30][31][32][33][34]. In such ligand-induced etching, atoms are detached from the nanoparticles surface by the ligand and then form nanoclusters through strong atom-atom interactions [35].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of a Broad Range of Colloidal Nanocrystals by Membrane-Mediated pH Gradient under Ambient Conditions

Ranjbar Bahadori,

Hart,

Mulgaonkar

et al. 2024

Crystals

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We report a simple synthesis process for a wide variety of ultrasmall nanocrystals. Simply immersing a dialysis bag containing an aqueous solution of a metal salt mixed with citric acid in a NaOH solution reservoir for 10 min, nanocrystals measuring only a few nanometers in size are formed inside the dialysis bag. We demonstrated the synthesis of ultrasmall nanocrystals of Co, Ni, Cu, Ag, Au, Pd, Cu2O, FeO, and CeO2, and found that the gradual change in pH caused by the diffusion of OH− ions through the dialysis membrane played an essential role in the formation of these nanocrystals. This method can be readily adapted for almost all transition metal elements, providing researchers in the fields of catalysis and nanomedicine an easy access to a wide range of ultrasmall metal and oxide nanocrystals.

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Numerical and experimental studies of the plastic strains distribution using subsequent direct extrusion after three twist extrusion passes

Cited by 31 publications

References 9 publications

Numerical Analysis of a New Nonlinear Twist Extrusion Process

Numerical Analysis of a New Nonlinear Twist Extrusion Process

Modeling of twist extrusion process parameters of AA6082-T6 alloy by response surface approach

Facile Synthesis of a Broad Range of Colloidal Nanocrystals by Membrane-Mediated pH Gradient under Ambient Conditions

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