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dc.contributor.authorZhou, D.
dc.contributor.authorWang, H.
dc.contributor.authorSaxey, David
dc.contributor.authorMuránsky, O.
dc.contributor.authorGeng, H.
dc.contributor.authorRickard, William
dc.contributor.authorQuadir, Z.
dc.contributor.authorYang, C.
dc.contributor.authorReddy, Steven
dc.contributor.authorZhang, D.
dc.date.accessioned2020-05-21T03:31:38Z
dc.date.available2020-05-21T03:31:38Z
dc.date.issued2019
dc.identifier.citationZhou, D. and Wang, H. and Saxey, D.W. and Muránsky, O. and Geng, H. and Rickard, W.D.A. and Quadir, Z. et al. 2019. Hall–Petch Slope in Ultrafine Grained Al-Mg Alloys. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 50 (9): pp. 4047-4057.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/79368
dc.identifier.doi10.1007/s11661-019-05329-3
dc.description.abstract

The Hall–Petch relation has long been used to relate the yield strength of a metal to its grain sizes in which the effectiveness of grain size strengthening in the metal is dictated by the Hall–Petch coefficient (slope). Therefore, understanding the microstructural dependence of the Hall–Petch slope would be very useful in designing new high-strength ultrafine grained (UFG) metallic materials. In this study, we investigated the microstructural factors affecting the Hall–Petch slope in UFG Al-Mg alloys with an average grain size range from 374 to 639 nm and different Mg contents of 0, 2.5, 5, and 7.5 at. pct. The rods prepared by extrusion of mechanically alloyed powder compacts were annealed for 5 hours at 380 °C, 420 °C, and 500 °C respectively followed by water quenching to produce the alloy samples in this study. The measured Hall–Petch slopes of the samples were found to increase with increasing Mg content and had higher values than those previously reported for Al(Mg) solid solutions with Mg concentrations comparable to the Mg contents in this study. Analysis of X-ray diffraction, transmission electron microscopy, and atom probe tomography experimental data as well as strengthening mechanisms demonstrates that the formation of nanoscale MgO dispersions plays a major role in the improved Hall–Petch slope observed in Al-Mg alloys.

dc.languageEnglish
dc.publisherSPRINGER
dc.subjectScience & Technology
dc.subjectTechnology
dc.subjectMaterials Science, Multidisciplinary
dc.subjectMetallurgy & Metallurgical Engineering
dc.subjectMaterials Science
dc.subjectSTRENGTHENING MECHANISMS
dc.subjectSTRAIN-RATE
dc.subjectPLASTIC-DEFORMATION
dc.subjectTHERMAL-STABILITY
dc.subjectALUMINUM
dc.subjectSIZE
dc.subjectDISPERSION
dc.subjectEXTRUSION
dc.subjectYIELD
dc.subjectMICROSTRUCTURE
dc.titleHall–Petch Slope in Ultrafine Grained Al-Mg Alloys
dc.typeJournal Article
dcterms.source.volume50
dcterms.source.number9
dcterms.source.startPage4047
dcterms.source.endPage4057
dcterms.source.issn1073-5623
dcterms.source.titleMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
dc.date.updated2020-05-21T03:31:36Z
curtin.departmentJohn de Laeter Centre (JdLC)
curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusFulltext not available
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidReddy, Steven [0000-0002-4726-5714]
curtin.contributor.orcidSaxey, David [0000-0001-7433-946X]
curtin.contributor.orcidRickard, William [0000-0002-8118-730X]
curtin.contributor.researcheridReddy, Steven [A-9149-2008]
curtin.contributor.researcheridSaxey, David [H-5782-2014]
curtin.contributor.researcheridRickard, William [E-9963-2013]
dcterms.source.eissn1543-1940
curtin.contributor.scopusauthoridReddy, Steven [7402263354]
curtin.contributor.scopusauthoridSaxey, David [15059256300]
curtin.contributor.scopusauthoridRickard, William [35171231700]


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