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Article: Evolution of dislocation and twin densities in a Mg alloy at quasi-static and high strain rates

TitleEvolution of dislocation and twin densities in a Mg alloy at quasi-static and high strain rates
Authors
KeywordsMg alloys
strain rate
twinning
dislocation density
Hopkinson tensile bar
Issue Date2020
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat
Citation
Acta Materialia, 2020, v. 201, p. 102-113 How to Cite?
AbstractThe present work, for the first time, quantitatively studies the evolution of both dislocations and deformation twins with various strain rates in an ATZ311 Mg alloy. Interrupted tensile tests were performed at the strain rates of 0.001, 1 and 600 s−1. Deformation twins were characterized by microscopy techniques and evaluated using the fractions of twin boundaries and twinned area. The average dislocation density and the relative fractions of dislocations with different Burgers vectors were determined from neutron diffraction data. It was found that the twin fraction increases remarkably and becomes saturated at lower strain rates (0.001-1 s−1), while the dislocation density only obtains an obvious enhancement at a much higher strain rate (600 s−1). Besides, the distinctively high flow stress at high strain rate leads to a substantial increase in the density of the hard-to-activate -type dislocations, after the -type dislocation density reaches rapidly its saturated value at a small strain level. The twinning modes with opposite polarities are able to coexist in the same grains because of the high local stress concentration at strain rates above 1 s−1.
Persistent Identifierhttp://hdl.handle.net/10722/289745
ISSN
2023 Impact Factor: 8.3
2023 SCImago Journal Rankings: 2.916
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, M-
dc.contributor.authorXU, X-
dc.contributor.authorWang, HY-
dc.contributor.authorHe, LH-
dc.contributor.authorHuang, MX-
dc.date.accessioned2020-10-22T08:16:52Z-
dc.date.available2020-10-22T08:16:52Z-
dc.date.issued2020-
dc.identifier.citationActa Materialia, 2020, v. 201, p. 102-113-
dc.identifier.issn1359-6454-
dc.identifier.urihttp://hdl.handle.net/10722/289745-
dc.description.abstractThe present work, for the first time, quantitatively studies the evolution of both dislocations and deformation twins with various strain rates in an ATZ311 Mg alloy. Interrupted tensile tests were performed at the strain rates of 0.001, 1 and 600 s−1. Deformation twins were characterized by microscopy techniques and evaluated using the fractions of twin boundaries and twinned area. The average dislocation density and the relative fractions of dislocations with different Burgers vectors were determined from neutron diffraction data. It was found that the twin fraction increases remarkably and becomes saturated at lower strain rates (0.001-1 s−1), while the dislocation density only obtains an obvious enhancement at a much higher strain rate (600 s−1). Besides, the distinctively high flow stress at high strain rate leads to a substantial increase in the density of the hard-to-activate -type dislocations, after the -type dislocation density reaches rapidly its saturated value at a small strain level. The twinning modes with opposite polarities are able to coexist in the same grains because of the high local stress concentration at strain rates above 1 s−1.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/actamat-
dc.relation.ispartofActa Materialia-
dc.subjectMg alloys-
dc.subjectstrain rate-
dc.subjecttwinning-
dc.subjectdislocation density-
dc.subjectHopkinson tensile bar-
dc.titleEvolution of dislocation and twin densities in a Mg alloy at quasi-static and high strain rates-
dc.typeArticle-
dc.identifier.emailHuang, MX: mxhuang@hku.hk-
dc.identifier.authorityHuang, MX=rp01418-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.actamat.2020.09.082-
dc.identifier.scopuseid_2-s2.0-85092393351-
dc.identifier.hkuros317269-
dc.identifier.volume201-
dc.identifier.spage102-
dc.identifier.epage113-
dc.identifier.isiWOS:000594740600011-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl1359-6454-

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