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Mechanical behavior and microstructural analysis of extruded AZ31B magnesium alloy processed by backward extrusion

Zhou, Ping and Beeh, Elmar and Friedrich, Horst E. and Grünheid, Thomas (2016) Mechanical behavior and microstructural analysis of extruded AZ31B magnesium alloy processed by backward extrusion. Materials and Design, 25 (7), pp. 2866-2877. Elsevier. DOI: 10.1007/s11665-016-2131-3 ISSN 0264-1275

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Official URL: http://link.springer.com/article/10.1007/s11665-016-2131-3?wt_mc=Internal.Event.1.SEM.ArticleAuthorAssignedToIssue

Abstract

This study investigates the mechanical behavior of an extruded AZ31B magnesium alloy profile at various strain rates from 0.001 to 375/s. The electron backscatter diffraction analysis revealed that the profile has {0001}⟨101 ¯ ¯ ¯ 0⟩ {0001}⟨101¯0⟩ and {101 ¯ ¯ ¯ 0}⟨112 ¯ ¯ ¯ 0⟩ {101¯0}⟨112¯0⟩ textures. Due to the textures, the profile exhibits pronounced anisotropy in mechanical properties. In the extrusion direction (ED), the profile shows the highest yield strength (YS) but the lowest total elongation at fracture (TE) due to a hard activation of non-basal slip and {101 ¯ ¯ ¯ 1}⟨101 ¯ ¯ ¯ 2 ¯ ¯ ¯ ⟩ {101¯1}⟨101¯2¯⟩ twinning; in the diagonal direction (DD), it shows the lowest ultimate tensile strength (UTS) but the highest TE due to an easy activation of basal slip; in the transverse direction (TD), it shows the lowest YS due to an easy activation of {101 ¯ ¯ ¯ 2}⟨101 ¯ ¯ ¯ 1 ¯ ¯ ¯ ⟩ {101¯2}⟨101¯1¯⟩ twinning. Moreover, the number of twins increases with the increasing strain rate. This indicates that deformation twinning becomes prevalent to accommodate high-rate deformation. Due to the different deformation mechanisms, the profile exhibits an orientation-dependent effect of strain rate on the mechanical properties. A positive effect of strain rate on the YS and UTS was found in the ED, while the effect of strain rate on the YS is negligible in the DD and TD. The TE in the ED, DD, and TD decreases in general as the strain rate increases. Fractographic analysis under a scanning electron microscope revealed that the fracture is a mixed mode of ductile and brittle fracture, and the magnesium oxide inclusions could be the origins of the fracture.

Item URL in elib:https://elib.dlr.de/101498/
Document Type:Article
Title:Mechanical behavior and microstructural analysis of extruded AZ31B magnesium alloy processed by backward extrusion
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Zhou, Pingping.zhou (at) dlr.deUNSPECIFIED
Beeh, Elmarelmar.beeh (at) dlr.deUNSPECIFIED
Friedrich, Horst E.horst.friedrich (at) dlr.deUNSPECIFIED
Grünheid, Thomasthomas.gruenheid (at) dlr.deUNSPECIFIED
Date:2016
Journal or Publication Title:Materials and Design
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:25
DOI :10.1007/s11665-016-2131-3
Page Range:pp. 2866-2877
Publisher:Elsevier
Series Name:Journal of Materials Engineering and Performance
ISSN:0264-1275
Status:Published
Keywords:Magnesium Alloy, Dynamic tensdile testing; Strain rate sensitivity, Texture, Fractographic analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - NGC Fahrzeugstruktur (old)
Location: Stuttgart
Institutes and Institutions:Institute of Vehicle Concepts > Lightweight and Hybrid Design Methods
Deposited By: Beeh, Elmar
Deposited On:10 Oct 2016 16:00
Last Modified:31 May 2019 05:01

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