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Obtaining Ultra‑High Strength and Ductility in a Mg–Gd–Er–Zn–Zr

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Vol.:(0123456789)13ActaMetallurgicaSinica(EnglishLetters)https://doi.org/10.1007/s40195-020-01132-xObtainingUltra‑HighStrengthand Ductilityin a Mg–Gd–Er–Zn–ZrAlloyvia Extrusion,Pre‑deformationand Two‑StageAgingLin‑Yue Jia1 ·Wen‑Bo Du1 ·Jin‑Long Fu1 ·Zhao‑Hui Wang1 ·Ke Liu1 ·Shu‑Bo Li1 ·Xian Du1Received:30March2020/Revised:2July2020/Accepted:3July2020©TheChineseSocietyforMetals(CSM)andSpringer-VerlagGmbHGermany,partofSpringerNature2020AbstractTheMg–12Gd–1Er–1Zn–0.9Zr(wt%)alloywithultra-highstrengthandductilitywasdevelopedviahotextrusioncombinedwithpre-deformationandtwo-stageagingtreatment.Theage-hardeningbehaviorandmicrostructureevolutionwereinves-tigated.Pre-deformationintroducedalargenumberofdislocations,resultinginstrainhardeningandhigherprecipitationstrengtheninginthesubsequenttwo-stageaging.Asaresult,thealloyshowedasuperiorstrength–ductilitybalancewithayieldstrengthof506 MPa,anultimatetensilestrengthof549 MPaandanelongationof8.2%atroomtemperature.Thefineranddenserβ′precipitatessignificantlyenhancedthestrength,andthebimodalstructure,smallβ-Mg5REphaseaswellasdenseγ′precipitatesensuredthegoodductilityofthealloy.Itissuggestedthatthecombinationofpre-deformationandtwo-stageagingtreatmentisaneffectivemethodtofurtherimprovethemechanicalpropertiesofwroughtMgalloys.KeywordsMagnesiumalloys ·Pre-deformation ·Two-stageaging ·Precipitationstrengthening ·Mechanicalproperties1IntroductionDuetothegreatpotentialforweightreductioninaerospaceandautomotiveindustries,Mg–RE(−Zn)(RE:rareearth)a

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