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

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

doi:10.1007/s11661-013-2094-z

Cited by 35 publications

(28 citation statements)

References 41 publications

(58 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: 87%

“…Although the grain size was probably finer than in the case of sample 2, small cracks were still observed on the billet surface so this processing route was classified as unsuccessful as well. Samples 9-11 followed 4 passes of I-ECAP at 250 °C to reduce the average grain size to ~6 µm [12]. Then, bars were subjected to another two passes at 200 °C.…”

Section: Resultsmentioning

confidence: 99%

“…The die temperature during processing was kept constant within ±2 °C, based on the readings obtained from a thermocouple located near the deformation zone. A siliconbased ceramic phase composite coating was applied on the billet surface prior to lubrication with conventional molybdenum disulphide (MoS 2 ) [12].…”

Section: Methodsmentioning

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: 87%

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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“…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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“…A novel continuous process of severe plastic deformation (SPD), called incremental equal channel angular pressing (I-ECAP) [11,12], was used in this work to produce finegrained billets from AZ31B magnesium alloy [13]. Additionally, bars processed by four passes of I-ECAP were subjected to side upsetting.…”

Section: Introductionmentioning

confidence: 99%

In situ analysis of the influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy

et al. 2015

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The influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy was studied in this work by in situ microstructural analysis during tensile testing in a chamber of scanning electron microscope. Three types of samples used in this study were obtained by (1) extrusion (as-supplied), (2) I-ECAP and (3) I-ECAP followed by side upsetting. Microstructures, textures and mechanical properties were examined after each processing step. An analytical equation was used to describe flow stress curves of the samples which exhibited various modes of deformation (1) only by slip, (2) dominated by tensile twinning followed by slip and (3) dominated by contraction twinning followed by slip. It was shown that tensile twinning increases strain hardening rate, while the opposite is observed for contraction twinning. The effective Schmid factors for slip in volumes deformed by tensile and contraction twinning were determined in this work using modelling approach as 0.215 and 0.45, respectively. Contraction twinning was also revealed to be responsible for an earlier fracture of the extruded sample subjected to tension, since microcracking was shown explicitly to be initiated within twins.

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

Cited by 35 publications

References 41 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

Producing High‐Strength Metals by I‐ECAP

In situ analysis of the influence of twinning on the strain hardening rate and fracture mechanism in AZ31B magnesium alloy

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