Zn对铸态及ECAP态Mg15Al合金组织与性能的影响.pdf

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1、第20卷第4期塑性工程学报Vo1．20No．42013年8月JOURNALOFPLASTICITYENGINEERINGAug．2013doi：10．3969／j．issn．1007—2012．2013．04．012Zn对铸态及ECAP态Mgl5AI合金组织与性能的影响(1．晋中职业技术学院机电工程系，榆次030600)郭玉玲，王伟伟谢超华(2．太原理工大学材料科学与工程学院，太原030024)王红霞曹晓卿。摘要：采用XRD、SEM、EDS和拉伸试验，研究添加Zn元素前后铸态和等通道转角挤压(ECAP)态Mg15A1高铝镁合金的组织和力学性能。结果表明，zn添加到Mg15A1合金中，主要固溶于

2、B—MgA1z相，不生成新相。能够促进铸态Mg15A1合金中aMg晶粒细化，使-MgA1z相质量分数增加，以及网状化加剧；使ECAP挤压后Mg15A1—1Zn合金中—Mg基体晶粒平均尺寸由ECAP态Mg15A1合金的11．3／,m减少到8．73／~m，促进了-MgA1z相的碎化和均匀分布；ECAP挤压能显著提高Mg15A1一lZn和MglSA1合金的综合力学性能，ECAP态Mg15A1—1Zn合金的抗拉强度较铸态合金提高了86，ECAP态Mg15A1合金抗拉强度较铸态提高了6O，而且在屈服强度和塑性变化不大的情况下，ECAP态Mg15A1一IZn合金比ECAP态Mg15A1合金室温抗拉强度提高

3、了61．8MPa。说明Zn元素添加，能促进ECAP挤压对Mg15A1合金的晶粒细化效果，提高合金的综合力学性能。关键词：高铝镁合金；Zn元素；等通道转角挤压；微观组织；力学性能中图分类号：TG146文献标识码：A文章编号：1007—2012(2013)04—0059—07EffectofZnadditiononthemicrostructureandmechanicalpropertiesoftheas—castandECAPedMgl5AIalloyGUOYu-ling’。WANGWei—weiXIEChao—hua。WANGHong—xia。CAOXiao—qing(1．Departmen

4、tofMachineandElectricEngineering，JinzhongVocationalTechnologyInstitute，Yuci030600China)(2．CollegeofMaterialsScienceandEngineering，TaiyuanUniversityofTechnologyTaiyuan030024China)Abstract：Microstructuresandmechanicalpropertiesoftheas—castandequalchannelangularpressed(ECAPed)Mg15A1alloyandMgl5A11Znall

5、oywereinvestigatedbyOM，XRD，SEM，EDSandthetensiletestsinthispaper．TheresultsshowthatZnelementaddedtoMg15A1alloymainlydissolvedintothe~-Mg17Al12phaseandnonewphasepresented．Thegrainsizeoftheas—castMg15A1alloywasdecreasedwithadditionoflwtZnelement，meanwhile，net-work-Mg17A112phasestendtoforlTlwiththeincre

6、asingamountofG—Mg17Al12．AfterprocessingbyECAP，thegrainsizeofd：Mgmatrixwasdecreasedsharply，from11．3m(inMg15A1)to8．73m(inMg15A1—1Zn)andthenetstructureof-Mg17Al12phasewasdisappearedandthemorphologywasmodified．Asaresult，themechanicalpropertiesofMg15A1—1ZnandMgl5A1alloywereimprovedbyECAP，andthetensilestr

7、engthofMg15A1—1ZnalloyandMglSA1alloywasincreasedby86and60respectivelycomparedwithitsas—caststate．Moreover，theincreasedamountofECAPedMg15A1—1V0ZnalloywasgreaterthanthatofECAPedMg15A1。about61．8MPainroom