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时间:2020-04-30
《Al和Zn对铸造Mg-5Sn合金微观组织和力学性能的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第49卷第5期r金属学跋V_01.49No.52013年5月第62l一628页ACTAMETALLURGICASINICAMay2013PP.621—628Al和Zn对铸造Mg一5Sn合金微观组织和力学性能的影响董旭光付俊伟杨院生(中国科学院金属研究所,沈阳110016)摘要根据合金成分设计,在Mg-5Sn铸造合金中逐步添加2%Al及4%zn(质量分数),实验结果表明,单独添加Al后,一次枝晶尺寸减小,且二次臂变的更加细密,合金的延伸率从6.6%提高到22.4%;Al和Zn复合添加后,长程枝晶转变为较为圆整的蔷薇状,在合金中生成了Mg32(A1,Zn)49
2、相,合金的屈服强度和抗拉强度分别达到96和232MPa,但延伸率则下降到l4.8%.通过固溶时效处理,Mg-5SnMZn-2A1合金在175℃时效24h后达到硬度峰值83.5HV,其晶内析出相由沿【0001]晶向分布的MgZn2和块状的Mg2Sn相组成,对应的室温屈服和抗拉强度分别提升到144和264MPa;在150℃下其屈服强度仍可达到138MPa,这表明合金的晶内析出的MgZn2和Mg2Sn相在高温下仍具有良好的强化作用.关键词Mg-5Sn合金,Al和Zn添加,微观组织,时效强化,力学性能,断口分析中图法分类号TG146.22文献标识码A文章编号041
3、2-1961(2013)05—0621—08EFFECTS0FAlANDZnADDITIONONTHEMICRoSTRUCTUREANDMECHANICALPRoPERTIESoFCASTMg-5SnALLoYDDⅣGguang.FUJunwei。】,ⅣGanshengInstituteofMetalResearch,ChineseAcademyofSciences,Shenyang110016Correspondent:'ⅣGYuansheng,professor,f(024)23971728,E-maihysyang@imr.ac.cnSupporte
4、dbyNationalHighTechnologyResearchandDevelopmentProgramofChinaNo.2011BAE22B01—1)Manuscriptreceived2012—12-07,inrevisedform2013-03-08ABSTRACTAcastMg-5Sn一4Zn-2Alalloywasdevelopedbyadding2%A1and4%Znfmassfraction1intoaMg-5Snbasealloy.TheresultsshowedthatthecombinedadditionofA1andZnhadm
5、oreobviousefectondendriterefinementthanthesingleAladdition.ThesingleAladditionremarkablyincreasedtheelongationfrom6.6%to22.4%.WithfurtheradditionofZn,Mg32(A1,Zn)49phasewasintroducedintothesolidifiedmicrostructure.andtheyieldstrengthandultimatetensilestrengthwereincreasedto96and232
6、MPawhileelongationwasdecreasedto14.8%.Afteragingtreatmentat175℃for24h.thereappearedpeakhardnessof83.5HVbyformingtherodhapedMgZn2alongc-axisandcubicMg2Snprecipitatesinto—MgmatrixforMg-5Sn-4Zn-2A1alloy~Withtheagingstrengthening,theyieldstrengthandultimatetensilestrengthwerefurtherin
7、creasedto144and264MPa.respectively.Whenthetestingtemperaturewaselevatedto150℃.theyieldstrengthofpeak-agedMg-5Sn-4Zn-2Alalloystillattainedto138MPa,whichindicatedthatboththeMgZn2andMg2Snprecipitatespossessgoodthermalstabilityforelevatedtemperatureproperty.KEYWoRDSMg-5Snalloy,additio
8、nofA1andZn,micr0structure,agingst
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