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Title
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Superior ductility and strength enhancement of ZK60 magnesium sheets processed by a combination of repeated upsetting and forward extrusion
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Type
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JournalPaper
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Keywords
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RepeatedUpsetting(RU)process Forwardsheetextrusion ZK60 Mgalloy Mechanical properties Superior ductility
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Abstract
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This researchworkisconcernedwithcreationofZK60Mgsheetsbyvariouscombinationsofthere- peated upsetting(RU)andforwardextrusion(Ex)operations.TheRUprocesswasconductedwithdif- ferent passesandat250 °C, whereasthesubsequentforwardextrusionwasperformedat220 °C. Complementary tensileteststogetherwithfractography,andmicrostructuralandtexturalstudieswere carried outinordertoinvestigatetheinfluence oftheprocesstypesandconditionsonthematerial properties ofthesheetproducts.ItwasfoundthatcombinationoftheRUandExoperationscouldresult in ductileZK60sheetswithimprovedstrengthandstrainhardeningcapacity.Themaximumelongation wasachievedafter3passesofRUfollowedbyExprocess.Thisprocessingroutealsoresultedinbalanced ultimate strengthsinbothextrusionandtransversedirectionswithalmostthehigheststrainhardening capacity.TheeffectsofRUnumberofpassesandforwardextrusionprocessonthemicrostructures, textures,mechanicalpropertiesandthefractureoftheZK60sheetswerealsoinvestigatedand,basedon the experimental findings obtained;severalimportantconclusionsweredrawnandexplainedinthis article.
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Researchers
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Reza Mahmudi (Fourth Researcher), (Third Researcher), (Second Researcher), Faramarz Fereshteh-Saniee (First Researcher)
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