Mechanical properties and microstructures of an AZ61 Mg Alloy produced by equal channel angular pressing

Kim, W.J.; An, Chao; Kim, Y.S.; Hong, Sung Il

doi:10.1016/s1359-6462(02)00094-5

Cited by 334 publications

(135 citation statements)

References 10 publications

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“…The inverse Hall-Patch effect, a negative slope of yield stress versus inverse mean grain size, was reported for ECAPed AZ61. [17] The decrease of the yield strength with subsequent passes of ECAP was also shown in other articles. [10,22] On the other hand, increase of yield stress after four passes was reported in Reference 18.…”

Section: Introductionsupporting

confidence: 65%

“…[10] Grain refinement led to formability enhancement accompanied by a yield stress decrease, which is usually observed for AZ31 magnesium alloy subjected to ECAP. [17,22] However, results obtained for the sample A indicate that grain size cannot be the only explanation for change of mechanical properties after I-ECAP. Different textural developments, arising from processing route, also contribute to changes in mechanical properties.…”

Section: A Effects Of Grain Size and Texture On Mechanical Propertiesmentioning

confidence: 95%

“…[13] The grain-refinement mechanism during the processing of magnesium alloys by ECAP is significantly different from that for fcc metals. [15] According to a model proposed by Figueiredo and Langdon [16] and experimental results, [8,9,17,18] the grain-refinement process is controlled by dynamic recrystallization (DRX). Observations of necklace-like and bimodal microstructures after ECAP of initially coarse-grained materials have confirmed this hypothesis.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP

Gzyl

Rosochowski

Pesci

et al. 2013

Metall Mater Trans A

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Incremental equal channel angular pressing (I-ECAP) is a severe plastic deformation process used to refine grain size of metals, which allows processing very long billets. As described in the current article, an AZ31B magnesium alloy was processed for the first time by three different routes of I-ECAP, namely, A, B C , and C, at 523 K (250°C). The structure of the material was homogenized and refined to~5 microns of the average grain size, irrespective of the route used. Mechanical properties of the I-ECAPed samples in tension and compression were investigated. Strong influence of the processing route on yield and fracture behavior of the material was established. It was found that texture controls the mechanical properties of AZ31B magnesium alloy subjected to I-ECAP. SEM and OM techniques were used to obtain microstructural images of the I-ECAPed samples subjected to tension and compression. Increased ductility after I-ECAP was attributed to twinning suppression and facilitation of slip on basal plane. Shear bands were revealed in the samples processed by I-ECAP and subjected to tension. Tensioncompression yield stress asymmetry in the samples tested along extrusion direction was suppressed in the material processed by routes B C and C. This effect was attributed to textural development and microstructural homogenization. Twinning activities in fine-and coarsegrained samples have also been studied.

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Section: Introductionsupporting

confidence: 65%

Section: A Effects Of Grain Size and Texture On Mechanical Propertiesmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP

Gzyl

Rosochowski

Pesci

et al. 2013

Metall Mater Trans A

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“…The AZ80 magnesium alloys have been widely used in aerospace, ship infrastructure, military, and automotive because they have high strength and stiffness and low density and can bear a large impact load [1]. Prior to application, the alloys are usually coated with oxide layers, and the surface coatings can be used to extensively protect the substrate materials from environmental damages, such as corrosion, abrasion, and oxidation [2].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Oxide Coating Thickness on the Small Flaw Sizing Using an Ultrasonic Test Technique

Miao

Li²,

et al. 2018

Coatings

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When magnesium alloys are tested using ultrasonic techniques, their oxide coating will affect the transmitted ultrasonic energy and the accuracy of the flaw sizing. In this work, the effects of the coating thickness on the flaw sizing are investigated. An ultrasonic measurement model is employed to predict the flaw response signal, and the reflected and transmitted ultrasonic energy in the coated surface are corrected by modifying the reflection and transmission coefficients related to the effects of the coating thickness. The effectiveness of these coefficients and the ultrasonic measurement model are verified through experiments. With the correction of the coating thickness effects, the flaw-sizing curves predicted using the ultrasonic measurement model are provided. The flaws in magnesium alloy specimens with different coating thicknesses are tested, and the determined flaw sizes from these curves agree well with the actual sizes, which reveals the effectiveness of the proposed work. This work provides an effective tool to improve the flaw sizing performance using ultrasonic techniques in practical applications.

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“…These materials possess improved mechanical properties at the room temperature and enhanced superplastic behavior at higher temperatures [3,4]. In general, there are two main processing categories to fabricate UFG and NS materials, called bottom-up and top-down manners.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Equal Channel Forward Extrusion Process

Ebrahimi

Djavanroodi

Tiji

et al. 2015

Metals

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Among all recognized severe plastic deformation techniques, a new method, called the equal channel forward extrusion process, has been experimentally studied. It has been shown that this method has similar characteristics to other severe plastic deformation methods, and the potential of this new method was examined on the mechanical properties of commercial pure aluminum. The results indicate that approximate 121%, 56%, and 84% enhancements, at the yield strength, ultimate tensile strength, and Vickers micro-hardness measurement are, respectively, achieved after the fourth pass, in comparison with the annealed condition. The results of drop weight impact test showed that the increment of 26% at the impact force, and also decreases of 32%, 15%, and 4% at the deflection, impulse, and absorbed energy, are respectively attained for the fourth pass when compared to the annealed condition. Furthermore, the electron backscatter diffraction examination revealed that the average grain size of the final pass is about 480 nm.

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Mechanical properties and microstructures of an AZ61 Mg Alloy produced by equal channel angular pressing

Cited by 334 publications

References 10 publications

Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP

Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP

Effects of the Oxide Coating Thickness on the Small Flaw Sizing Using an Ultrasonic Test Technique

Experimental Investigation of the Equal Channel Forward Extrusion Process

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