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时间:2020-04-30
《Zn及热处理制度对2056铝合金力学性能及局部腐蚀行为的影响.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l7卷第1期粉末冶金材料科学与工程2012年2月Vb1.17NO.1MaterialsScienceandEngineeringofPowderMetallurgyZn及热处理制度对2056铝合金力学性能及局部腐蚀行为的影响罗先甫,郑子樵,葛婧萱,张海锋,钟警(中南大学材料科学与工程学院,长沙410083)摘要:通过拉伸性能测试、晶间腐蚀(IGC)、剥落腐蚀(EXCO)实验、极化曲线测试及透射电镜(TEM)分析,研究Zn元素和不同热处理制度对2056铝合金室温常规力学性能、抗晶间腐蚀性能、抗剥落腐蚀性能及微观组织的影响。结果表明,微量zn均匀存在于合金的各个
2、位置,可促进相的析出和提高合金强度;减小晶内与晶界的电化学腐蚀动力,使晶界析出的相数量减少并不连续分布,无沉淀析出带(PFZ)变窄,提高合金的抗晶间腐蚀性能和抗剥蚀性能。与T6处理态相比,经T8处理后,晶内析出的相数量增加、尺寸减小、分布均匀,合金的强度显著提高,塑性降低;同时,沿晶界析出的相数量减少,PFZ变窄,合金的抗晶间腐蚀和抗剥落腐蚀能力提高。在3.5%的NaCI溶液中进行的极化曲线测试也表现出相同的结果。关键词:Zn;热处理;2056铝合金;局部腐蚀;微观组织中图分类号:TGI46.2文献标识码:A文章编号:1673.0224(2012)1—055.
3、08EffectsofZnandagingconditiononmechanicalpropertiesandlocalcorrosionbehaviorof2056aluminumalloyLUOXian—fu,ZHENGZi—qiao,GEJing—xuan,ZHANGHai—feng,ZHONGJing(SchoolofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,China)Abstract:TheefectsofZnandagingconditiononmec
4、hanicalproperties,intergranularcorrosionresistance,exfoliationcorosionresistanceandmicrostructureof2056aluminumalloywereinvestigatedbymeansoftensiletesting,intergranularcorosionexperiments,exfoliationcorosionexperiments,polarizationcurvesmeasurementandtransmissionelectronmicroscopy(
5、TEM)analysis.TheresultsshowthattraceZndistributesuniformlyinthealloyanditcanpromotetheprecipitationofSphasewhichcanimprovethestrengthanddecreasetheelectrochemistrycorosionkinetics.TheprecipitationofSequilibriumphasesalongthegrainboundariesdecreasesanddistributesdiscontinuously,andth
6、eprecipitatefreezone(PFZ)becomesnarrowerinthealloycontainingZn,whichcanenhancetheexfoliationcorrosionresistanceandtheintergranularcorosionresistanceofthealloy.AfterT8temper,thestrengthimprovesandtheplasticitydecreases.1essphaseprecipitatesuniformlyatthegraininterface.Theprecipitatio
7、nofSequilibriumphasesalongthegrainboundariesdecreasesandthePFZbecomesmuchnarower,whichcanimprovetheintergranularcorrosionresisitanceandexfoliationcorosionresistancecomparedwithT6temper.Thetestofpolarizationcurvesinthe3.5%NaClsolutionrevealsthesameconelusion.Keywords:Zn;agingtreatmen
8、t;2056aluminumalloy
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