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dc.contributor.authorChi, Chao-Tingen_US
dc.contributor.authorChao, Chuen-Guangen_US
dc.contributor.authorLiu, Tzeng-Fengen_US
dc.contributor.authorWang, Che-Chungen_US
dc.date.accessioned2014-12-08T15:15:24Z-
dc.date.available2014-12-08T15:15:24Z-
dc.date.issued2006-11-05en_US
dc.identifier.issn0921-5093en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.msea.2006.07.098en_US
dc.identifier.urihttp://hdl.handle.net/11536/11560-
dc.description.abstractGiven the growing need for environmental protection and lightweight construction, electron beam welding (EBW) is becoming the most important welding technology because it can compensate for the poor formability of magnesium alloys. This paper examines interactions between the properties of three AZ series magnesium alloys and welding conditions. The EBW process can yield four kinds of defect in a weld: cavities, the heat-affected zone (HAZ), undercuts, and root concavities. These defects obviously induce stress concentrations in the weld, and may seriously damage its strength. Additionally, the distribution of precipitates (gamma phase, Mg17Al12) in the fusion zone (FZ) changes from a relatively small number of scattered particles to a dense population of dendrites as the Al content of the magnesium alloy increases. Under excessive tensile stress, alloy weldments break in one of two fracture modes: an irregular FZ fracture, or a regular HAZ fracture. AZ31B usually exhibits the former mode and AZ91D the latter, while AZ61A exhibits each mode half the time. The overall weldability, which depends on the random distribution of these precipitates and defects, is found to be greatest for the AZ61A alloy. The best process window, on the other hand, is found for the AZ91D alloy. Finally, we obtain optimum parameters for the EBW process and empirical formulae for the weldment strength as a function of these parameters. These results are closely related to each other. (c) 2006 Elsevier B.V. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectelectron beam weldingen_US
dc.subjectweldabilityen_US
dc.subjectprocess windowen_US
dc.subjectfracture modeen_US
dc.titleA study of weldability and fracture modes in electron beam weldments of AZ series magnesium alloysen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.msea.2006.07.098en_US
dc.identifier.journalMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSINGen_US
dc.citation.volume435en_US
dc.citation.issueen_US
dc.citation.spage672en_US
dc.citation.epage680en_US
dc.contributor.department材料科學與工程學系zh_TW
dc.contributor.departmentDepartment of Materials Science and Engineeringen_US
dc.identifier.wosnumberWOS:000241683200091-
dc.citation.woscount25-
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