粉末冶金制备AlCrMoNiTi高熵合金的时效硬化特性.pdf

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1、RareMetalMaterialsandEngineeringAvailableonlineatwww．sciencedirect．corn^Volume43，Issue6，June2014^^OnlineEnglisheditionoftheChineselanguagejourna瓣ScienceDU‘irect一AgeHardeningofAlCrMoNiTiHighEntropyAlloyPreparedbyPowderMetallurgyRenBo’I_MaJianhui’ZhaoRuifeng’GuanShaokang，ZhangHongsong’，，，

2、HenanInstituteofEngineering,Zhengzhou451191，China；ZhengzhouUniversity,Zhengzhou450052，ChinaAbstract：TheA1CrMoNiTihighentropyalloywaspreparedbypowdermetallurgyprocess．Itsmicrostructureandhardnessofas—castandannealedstatewerestudied．Theresultsshowthattheas—castalloyexhibitsamixtureofthede

3、ndrite(Cr，Mo)一richbccphaseandtheinterdendrite(Al，Ni，Ti)一richfccphase．TheagedalloycanobtainapeakhardnessHVof6150MPaat900。C，andthenannealsofteningOccursat1000。C，butitshardnessHVstillmaintainedatahighlevelof5160MPa．ThisshowsthattheAICrMoNiTialloyexhibitsagoodhigh—temperatureagehardeningper

4、formance．Agehardeningofthealloyismainlyattributedtothegrainrefinementstrengtheningat800。Candtheprecipitationhardeningofthesecondphase(bcc2)at900。C．Thedisappearedsecondphaseandgraincoarseningarcthemainreasonsforthesofteningannealat1000。C．Keywords：highentropyalloy；powdermetallurgyprocess；

5、solidsolution；microstructure；agehardeningInthe1990s．YehandCantorsuggestedanovelconceptstructuresandproperties，butthereisstillsomeknowledgeonaboutalloydesign，namelymulti—principalhighentropyalloystheHEAsrequiredtobeknown．Inthepast，thepreparation(HEAs1composedofatleastfiveprincil；}aleleme

6、msinmethodsofHEAsweremainlycastingprocessandequimolarornear-equimolarratiosllI2】mechanicalalloying【。】Thealloyspreparedbythe．HEAshavemanyinterestingcharacteristicsasaresultoftheirmulti·principal-traditionalcasttechniquehavemanystructuraldefectssuchaselementmixtures，suchashighmixingentrop

7、y,latticevoids，porosity，lowas-casthardness．Recently，thedistortion，sluggishdifusion，andcocktaileffect，whichareAICrFeNiCoCuandA1NiCrFexMoo2CoCuhighentropyalloysthecorefactorsinfluencingtheirmicrostructuresandhavebeensuccessfullypreparedbypowdermetallurgyproperties【lJ．Comparedwith