Microstructural homogeneity, texture, tensile and shear behavior of AM60 magnesium alloy produced by extrusion and equal channel angular pressing

Akbaripanah, F.; Fereshteh-Saniee, F.; Mahmudi, R.; Kim, H.K.

doi:10.1016/j.matdes.2012.06.051

Cited by 124 publications

(31 citation statements)

References 28 publications

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“…However, after the 3rd pass of the process, the product represented about 97 % of the ductility of the annealed billet without any considerable reduction in the strength. These observations are in agreement with those reported by other researchers for copper, titanium, and aluminum (AA1050) [41][42][43]. In order to achieve a high strength and ductile product at the same time, it should be subjected to an effective strain higher than a particular value [42].…”

Section: Resultssupporting

confidence: 91%

Expansion equal channel angular extrusion, as a novel severe plastic deformation technique

Sepahi-Boroujeni

Fereshteh-Saniee

2015

J Mater Sci

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A novel severe plastic deformation (SPD) process, namely expansion equal channel angular extrusion (Exp-ECAE) is proposed in this paper. With this regard, a spherical cavity is provided at the junction of the ECAE channels. The numerical simulations of the Exp-ECAE process resulted in finding suitable tool geometry for this operation. Using this optimum shape, several practical Exp-ECAE experiments were conducted with AA6063 aluminum at different process conditions. Because of the expansion cavity, a pseudo back-pressure mechanism was provided for the tests. The experimental findings showed that after the 1st pass of the Exp-ECAE process, the yield stress and hardness of the material were increased about 300 and 50 %, respectively. These improvements were much more than those achieved via other SPD techniques such as ECAE and twist extrusion for the same alloy. The homogeneity of hardness distribution along the cross section of the Exp-ECAE product was also acceptable. Further passes of the process just resulted in better ductility for the component such that after the 3rd pass, almost 97 % of ductility of the annealed billet was recovered. However, a slight decrease in the strength of the product was observed after the 2nd and 3rd passes.

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Section: Resultssupporting

confidence: 91%

Expansion equal channel angular extrusion, as a novel severe plastic deformation technique

Sepahi-Boroujeni

Fereshteh-Saniee

2015

J Mater Sci

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“…In this study, it aims to describe the grain distribution from a quantified point of view, instead of from a statistical analysis one [31]. Thus, homogeneity (Table 6) is selected to describe the grain distribution on the surface.…”

Section: Positional Parametermentioning

confidence: 99%

Surface Topography Quantification of Super Hard Abrasive Tools by Laser Scanning Microscopy

Fang

Llanes

Engstler

et al. 2016

Materials Performance and Characterization

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Non-conventional super hard abrasive tools are made of composite materials containing super hard grains, e.g., diamond or cubic boron nitride (CBN) grains, bound by a metallic constitutive phase. These tools are usually produced by means of sintering, and are widely applied in the abrasive machining processes of modern manufacturing, especially in precision machining. The abrasive grains, which induce the material removal processes, are embedded in the metallic binder. They emerge as a consequence of self-dressing, resulting in a self-sharping effect. Therefore, the cutting surface of the tool displays an irregular topography. Quantification of surface topography scenario may supply valuable information to evaluate and understand its correlation to wear mechanisms. In this study, an experimental protocol consisting of five steps: specimen preparation, surface scanning, image assembly, image digital processing and surface quantification, is proposed and validated by characterizing two CBN honing tools used for precision machining: B151/L2/10/50 (B151) and B91/128/x44/35 (B91) CBN honing stones. It involves the use of laser scanning microscopy and digital imaging processing for assessing significant dimensional, geometrical and positional properties of CBN grains at the surface of super hard abrasive tools. It is shown that surface topography quantification is an effective method to evaluate and obtain the defined parameters. However, smaller grains may require images with higher resolution; and thus, scanning must be refined. Finally, a critical comparative analysis of the experimental results attained for the studied tools points out honing stone B91 as more appropriated than B151 one for achieving a higher machining quality of the workpiece.

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“…[1][2][3] To overcome this problem, many scholars paid more attention to the grain refinement using severe plastic-deformation (SPD) techniques. 4,5 Nowadays, the most attractive SPD procedures are equal-channel angular pressing (ECAP), 6,7 cyclic extrusion compression (CEC), 8,9 high-pressure torsion (HPT) 10,11 and accumulative roll bonding (ARB). 12,13 A. Muralidhar et al 14 adopted four passes of ECAP via the B c route for a magnesium alloy at a temperature of 573 K. The average grain size was reduced from 31.8 μm to 8 μm.…”

Section: Introductionmentioning

confidence: 99%

Improving the microstructure and mechanical properties of magnesium-alloy sheets with a new extrusion method

Lu¹,

Yin²,

Liu³

et al. 2017

Mater. Tehnol.

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A new effective extrusion technique, including integrated direct extrusion and bending-shear deformation, was proposed to fabricate AZ31-magnesium-alloy sheets with high performance, and the grain refinement, texture and mechanical properties were further investigated. The results show that the new extrusion technique can noticeably refine the grain size from 240 μm to 3.2 μm at 563 K, and the basal texture is also dramatically weakened, which can be attributed to a fully dynamic recrystallization triggered by a large shearing strain accumulated due to a bar-sheet deformation and continuous bending-shear deformation. Consequently, the ductility significantly increases from 11.67 % to 27.7 %, and the ultimate tensile stress can still keep a high value of 290 MPa, rendering this new technique an effective processing method for further tailoring of the microstructure and properties of Mg-based alloys for a wide range of engineering applications. Keywords: AZ31-Mg alloy, hot extrusion, microstructure, mechanical properties Avtorji prispevka so raziskovali vpliv nove u~inkovite tehnike iztiskavanja (ekstrudiranja) na lastnosti plo~evine iz Mg zlitine AZ31. Pri tej tehniki sta zdru`ena postopka direktnega iztiskanja in upogibanja s stri`no deformacijo (angl.: Direct Extrusion and Bending Shear; DEBS). Avtorji ugotavljajo, da je pri{lo do udrobljenja mikrostrukture, raziskali pa so tudi teksturo in dolo~ili mehanske lastnosti tako izdelane plo~evine. Rezultati raziskave so pokazali, da je nova tehnika ekstrudiranja opazno zmanj{ala velikost kristalnih zrn iz 240 μm na 3,2 μm pri 563 K (290°C), prav tako je ob~utno oslabela bazala tekstura, kar je pripisati popolni dinami~ni rekristalizaciji zaradi velike stri`ne deformacije nakopi~ene med preoblikovanjem okroglice v plo~evino in neprekinjene upogibno-stri`ne deformacije. Posledi~no se je ob~utno povi{ala duktilnost iz 11, 67 % na 27, 7 % in natezna trdnost je {e vedno ostala na visokem nivoju 290 MPa. Zato ta nova tehnika iztiskavanja lahko postane u~inkovita procesna tehnologija za nadaljnje prilagajanje mikrostrukture in lastnosti Mg zlitin {iroki paleti in`enirskih aplikacij. Klju~ne besede: AZ31 magnezijeva zlitina, vro~e ekstrudiranje, mikrostruktura, mehanske lastnosti

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Microstructural homogeneity, texture, tensile and shear behavior of AM60 magnesium alloy produced by extrusion and equal channel angular pressing

Cited by 124 publications

References 28 publications

Expansion equal channel angular extrusion, as a novel severe plastic deformation technique

Expansion equal channel angular extrusion, as a novel severe plastic deformation technique

Surface Topography Quantification of Super Hard Abrasive Tools by Laser Scanning Microscopy

Improving the microstructure and mechanical properties of magnesium-alloy sheets with a new extrusion method

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