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时间:2020-06-01
《淬火温度对Al_(0.5)CoCrFeNiSi_(0.2)高熵合金组织结构的影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第30卷第3期材料科学与工程学报总第137期Vo1.30NO.3JournalofMaterialsScience&EngineerinJun.2012文章编号:1673—2812(2012)03—0422—06淬火温度对Al0.5CoCrFeNiSi高熵合金组织结构的影响吴桂芬,唐群华,柯跃前,戴品强。,吴波(1.福州大学材料科学与工程学院,福建福州350108;2.泉州师范学院物理与信息工程学院。福建泉州362000;3.福建工程学院材料科学与工程系。福建福州350108)【摘要】采用真空电弧熔炼的方法制备了高熵合金
2、AlCoCrFeNiSi。.。对其进行600℃到1100℃保温1Oh后淬水的淬火处理。通过金相显微镜、扫描电镜及附带的能谱仪、X射线衍射仪和透射电镜观察分析合金的组织结构。用显微硬度计测定合金的显微硬度。结果表明:铸态和淬火态的合金组织均呈典型的枝晶形貌,枝晶含有非晶相和纳米级颗粒。在淬火加热温度低于800℃时,随着淬火温度升高,晶粒细化、fcc相含量减少,硬度随淬火温度的升高而提高;当温度升高至900℃后,枝晶相长大,fcc相含量增加,大块枝晶中析出一种富含A1、Ni的e相,硬度下降。【关键词】高熵合金;淬火温度;微观
3、组织中图分类号:TG115.2文献标识码:AEffectofQuenchingTemperatureontheMicrostructureofHigh’entropyAl0.5CoCrFeNiSi0.2AlloyWUGui-fen,TANGQun-hua,KEYue-qian,DAIPin-qiang,WUBo(1.CollegeofMaterialsScienceandEngineering,FuzhouUniversity,Fuzhou350108,China;2.CollegeofPhysicsandInforma
4、tionEnginering,QuanzhouNormalUniversity,Quanzhou362000,China;3.DepartmentofMaterialsScienceandEngineering,rujianUniversityofTechnology,Fuzhou350108,China)[Abstract]High—entropyA1。.5CoCrFeNiSio,2alloywaspreparedbythearcmeltingandcastingmethod.As—castalloywasheated
5、at600℃~1100℃forlOhandsubsequentlyquenchedintowater.Microstructureofthealloywascharacterizedbyopticalmicroscopy(0M),scanningelectronmicroscopy(SEM),X—rayenergy—dispersivespectrometry(EDS),X—raydiffractometry(XRD)andtransmissionelectronmicroscopy(TEM).Hardnessofthe
6、alloywasmeasuredbyaVickershardnesstester.Theresultsshowedthatthemicrostructuresofas—castandas—quenchedalloyexhibitedtypicaldendriteandinter—dendritestructures.Dendritescontainedanamorphousphaseandnano—scaleprecipitates.Whenthequenchingtemperatureislowerthan800℃。t
7、hehardnessoftheas—quenchedalloyincreasedwithincreasingquenchingtemperature,thiscanbeattributedtodendriterefinement,inter—dendritephaseincreaseanddecreaseofthefeephase.Whenthequenchingtemperatureishigherthan900℃,thedendritephasegrewup,thefccphaseincreasedandaNi—A1
8、richphaseprecipitatedinthedendrites,whichresultedinthehardnessofalloytodecrease.[Keywords]high—entropyalloy;quenchingtemperature;microstructure高熵合金又称多主元合金Ⅲ,是传统
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