Route Effects in I-ECAP of AZ31B Magnesium Alloy

Gzyl, Michal Zbigniew; Rosochowski, Andrzej; Yakushina, E.; Wood, Paul; Olejnik, Lech

doi:10.4028/www.scientific.net/kem.554-557.876

Cited by 16 publications

(10 citation statements)

References 20 publications

(19 reference statements)

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“…The processing temperature was increased to 250 °C in the next set of experiments and four passes of I-ECAP were successfully completed using routes A, B C and C, which are referred to in Table 1 as samples 3, 4 and 5, respectively. The influence of the processing route on mechanical properties has been already reported in [12][13].…”

Section: Resultsmentioning

confidence: 99%

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The Effect of Initial Grain Size on Formability of AZ31B Magnesium Alloy during I-ECAP

Gzyl¹,

Rosochowski²,

Olejnik

et al. 2014

KEM

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This version is available at https://strathprints.strath.ac.uk/48142/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. Abstract. The goal of this work was to investigate formability of AZ31B magnesium alloy during incremental equal channel angular pressing (I-ECAP). Square billets were processed using different routes of I-ECAP at temperatures varying from 125 °C to 250 °C. The billets were obtained from commercially available coarse-grained, hot-extruded rod and fine-grained, hot-rolled plate. A strong influence of the initial microstructure on processing temperature was reported. Finegrained samples were successfully processed at 200 °C, while coarse-grained ones must have been heated up to 250 °C to avoid fracture. A gradual temperature decrease with subsequent passes allowed successful pressing at 150 °C. Processing using various routes of I-ECAP showed that a billet rotation before the last pass had strong influence on mechanical properties. The results of experiments were plotted on the diagram of allowable processing temperature for AZ31B. It was found that the relation between the minimum temperature in I-ECAP and the initial grain size could be described by a logarithmic equation.

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Section: Resultsmentioning

confidence: 99%

“…Its height was non-uniform along cross-section and was varying from 7.5 to 9 mm. This effect was attributed to the inhomogeneous strain rate sensitivity of the material arising from the non-uniform strain distribution [13].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Initial Grain Size on Formability of AZ31B Magnesium Alloy during I-ECAP

Gzyl¹,

Rosochowski²,

Olejnik

et al. 2014

KEM

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“…The mean grain sizes reported for different conditions were 1 lm at 423 K (150°C), [7] 2 lm [8,9] at 473 K (200°C), and 6 lm at 523 K (250°C). [10,11] In order to enable further grain refinement, the processing temperature must be decreased along with a simultaneous decrease of strain rate. Different experimental plans were proposed to conduct ECAP at temperatures lower than 473 K (200°C) without crack occurrence.…”

Section: Introductionmentioning

confidence: 99%

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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“…Al5083 was heated up to 200 C and subjected to eight passes of I-ECAP while CP-Ti was subjected to four passes of I-ECAP at 320 C. Gradual decrease of temperature with consecutive passes was used for AZ31B; first pass was conducted at 200 C, second one at 175 C, and the last two passes at 150 C. Additionally, I-ECAPed magnesium billets were subjected to heat treatment for 1 h at 150 C, which aimed at increasing ductility without lowering strength. Billets were rotated by 90 between consecutive passes (route B C ) in the cases of Al5083 and CP-Ti, however, our previous results [18] showed that processing path without any rotation (route A) resulted in more efficient improvement of strength for AZ31B magnesium alloy than route B C . The summary of experimental plan for different materials can be found in Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…The punch is moving in a reciprocating manner while the billet is fed into deformation zone in consecutive steps. As the first trials with pure aluminum and pure copper were successful, the work is now being continued with magnesium alloys [18][19][20][21] and other materials. The goal of the current work is to show the I-ECAP capability of improving strength of different alloys, which would extend the field of their possible applications.…”

Section: Introductionmentioning

confidence: 99%

Producing High‐Strength Metals by I‐ECAP

et al. 2015

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Incremental equal channel angular pressing (I‐ECAP) is used in this work to produce ultrafine‐grained (UFG) pure iron, aluminum alloy 5083, commercial purity titanium (grade 4), and magnesium alloy AZ31B. Pure iron is processed at room temperature, aluminum alloy at 200 °C, titanium at 320 °C, and magnesium alloy at 150 °C. Strength improvement, attributed to the grain refinement below 1 μm, is reported for all processed materials. The yield strength increase is the most apparent in pure iron, reaching almost 500 MPa after one pass of I‐ECAP, comparing to 180 MPa in the as‐forged conditions. UFG titanium, aluminum, and magnesium alloys obtained in this study reached yield stress of 800, 350, and 300 MPa, respectively, in each case exhibiting the yield strength increase by at least 30%, comparing to the alloys processed by conventional metal forming operations such as forging and rolling.

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Route Effects in I-ECAP of AZ31B Magnesium Alloy

Cited by 16 publications

References 20 publications

The Effect of Initial Grain Size on Formability of AZ31B Magnesium Alloy during I-ECAP

The Effect of Initial Grain Size on Formability of AZ31B Magnesium Alloy during I-ECAP

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

Producing High‐Strength Metals by I‐ECAP

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