资源描述：
《挤压Zn_Cu_Ti合金的组织及其力学性能》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28卷第4期材料科学与工程学报总第126期Vol128No14JournalofMaterialsScience&EngineeringAug.2010文章编号:167322812(2010)0420576206挤压Zn2Cu2Ti合金的组织及其力学性能1,21,21111张喜民,肖来荣,温燕宁,耿占吉,张宏岭,孙泉胜(1.中南大学材料科学与工程学院,湖南长沙410083;2.中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083)【摘要】采用Zn2Ti中间合金等制备了不同铜含量的锌合金,370℃/4h均匀化后
2、在300℃对合金进行了热挤压加工。通过X射线衍射分析、扫描电镜分析和能谱分析以及力学性能测试,研究了合金的微观组织和力学性能之间的关系。结果表明,Zn2Cu2Ti合金主要由锌的固溶体η相,TiZn15相和CuZn4相组成,Ti元素的加入细化了合金的显微组织,提高了合金的力学性能;热挤压过程中,合金发生动态再结晶和局部再结晶晶粒长大现象,TiZn15相和CuZn4相被破碎后沿挤压方向分布于晶界处,有助于阻碍再结晶晶粒的长大;Cu含量在0.5%～3.0%范围内,随着含铜量的增加,Zn2Cu2Ti合金的强度和硬度增大,当Cu含量超过
3、2.0%时伸长率有下降趋势;由于挤压过程中发生了动态再结晶在一定程度上抵消了加工引起的硬化,合金挤压态硬度较铸态硬度提高不大。【关键词】挤压Zn2Cu2Ti合金;微观组织;力学性能;合金化中图分类号:TG146.1文献标识码:AMicrostructureandMechanicalPropertiesofExtrudedZn2Cu2Tialloys1,21,21ZHANGXi2min,XIAOLai2rong,WENYan2ning,111GENGZhan2ji,ZHANGHong2ling,SUNQuan2sheng(1.S
4、choolofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,China;2.KeyLaboratoryofNon2ferrousMaterialsScienceandEngineeringofMinistryofEducation,CentralSouthUniversity,Changsha410083,China)【Abstract】Zn22.0CualloyandaserialsofextrudedZn2Cu2Tialloyswi
5、th0.5wt%to3.0wt%Cuand0.2wt%TiwerepreparedbymeltingthemixtureofZn2Ti,Zn2CuintermediatealloysandhighpurityZinc.Afterhavingbeenhomogenizedat370℃for4h,thealloyswereextrudedat300℃.MicrostructurecharacteristicsandmechanicalpropertieswereinvestigatedbyX2raydiffractometry(X
6、RD),scanningelectronmicroscopy(SEM),X2rayenergy2dispersivespectroscopy(EDS),andmechanicalpropertytests.Theresultsshowedthat,TiZn15andCuZn4intermetallicsformedandtheprimaryintermetallicphaseTiZn15refinedwhichhelpstoimprovemechanicalpropertiesofthealloys.Afterhavingbe
7、enextruded,dynamicrecrystallizationhappenedinthezinc2richedsolidsolution,andtheTiZn15andCuZn4phaseswerescrappedandorientedalongtheextrudingdirection,whichhelpstosuppressthegrowthofgrains;TensilestrengthandVickershardnessincreasedwithincreasingcoppercontentintherange
8、of0.5%to3.0%,butthemaximumelongationof49%occurredwhenthecontentofCuwas2%.Duetothedynamicrecrystallization,theHVsofextrudedalloyswerenotqui
