准晶增强的Mg-Zn-Al-(Y)合金热压缩变形行为重点

1、4712Vol.47No.122011121520- 1526ACTAMETALLURGICASINICADec.2O11pp.1520-1526Mg 送n -M -Y)1,2)1,2)?1,2)1,2)1)2),200240,200240,Mg -Zn -Al(ZA84)Mg 8Zn FAI -).5Y(ZAY8405)Gleeble-5002300.0015- 1.5s-1,Mg Zn -M -Y)a Mg.:ZA84,ZAY8405,Y;Mg 送n -Al -(Y),ZAY8405;,Mg 送n A -(Y),ZAY8405Y.Mg 送n A ),TG146.2A0412-1961(20

2、11)12-1520-07HOTCOMPRESSIONDEFORMATIONBEHAVIOROFMg 吃n -Al - (Y)ALLOYSREINFORCEDWITHQUASICRYSTALTONGJia n1,2),HUANGHua1,2), YUANGua ngyi n1,2),DINGWenjia ng1,2)1) LightAlloyNetFormi ngNatio nalE ngin eeri ngResearchCe nter,SchoolofMaterialsScie nc eandEngin eeri ng,Sha nghaiJiaoT ongUn iversity,Sha n

3、ghai2002402) TheStateKeyLaboratoryofMetalMatrixComposite,SchoolofMaterialsScie ncea ndEngin eeri ng,Sha nghaiJiaoT ongUn iversity,Sha nghai200240Correspo nden t:YUANGua ngyi n,professor,Tel:(021)34203051,E-mail:gyyua n .c nSupportedbyNatio nalNaturalScie nceFou ndatio nofChi na(No.51174136),

4、SpecializedRes earchFun dfortheDoctoralProgramofHigherEducatio no fChi na(No.20100073110004)an dScie ncean dTech nologyCommissio nofSha nghaiMu nicipality(No.10JC1407400)Manuscriptreceived2011 -06 T7,inrevisedform2011 T0 T5ABSTRACTQuasicrystalphaseo? ersagoodcombinationofstrengthandductilityduetothe

5、st rongin terfacebetwee nthequasicrystalphasea ndtheMgmatrix.HotcompressiontestsofMgZn -Al (Y)basedalloysrei nforcedwithquasicrystalwereperformed on Gleebl 1500thermalsimulati onm achi nean dstra in ratesra ngedfrom0.0015s-1to1.5s-1.atac on sta ntdeformati on temperatureof230 Microstructureevolution

6、ofhot -compressedMgZn -M -(Y)alloysa ndtherelati on shipbetwee n? owstressa ndstrai nratewestudied.XRDa ndSAEDr esultsshowthatthemicrostructuresofascastMg -8Zn FAI(ZA84)andMg -8Zn FAI - 0.5Y(ZAY8405)arecomposedoficosahedralquasicrystalphasea ndaMgmatrix.Thequasicrystalsi nZA84a ndZAY8405alloyshaveas

7、toichiometriccompositio n ofMg38Z n43AI19a ndMg51Z n30AI19respectively.Dy namicrecrystalizatio n(DRX)takep laceduri nghotcompressio nan dthe?owstressi ncreaseswhe nin creasi ngthestrai nrateatac ons tan tcompressio ntemperature,whichca nbereprese ntedbythePowerExp onen tialEquatio n.D eformatio ntwi

8、 nninganddyn amicrecrystalizatio nareeasiertotakeplacei nZAY8405alloysdu etothere ?n eda nddispersedquasicrystalphasewithYadditi on.KEYWORDSMg 4Zn -M -Y)alloy,icosahedralquasicrystal,hotcompressiondeformation, dyn amicrecrystalizatio n*51174136,2010007311000410JC1407400:2011 6-7,:2011 1015 :,1985,D0

9、l:10.3724/SP.J.1037.2011.0037212Mg 送n A -Y)1521J1J3C()J JMg,:(1)Mghcp2；(2)3；(3)J4J()5()6,710 12J2Shechtma n89 .Yua nLiu10,311MPa,214MPa, 17%,20094%, 11 .SomekawaMgZ n 12Mg -Zn AI(ZA84) (ZAY8405)2Mg -Zn -4Al -0.5Y,1ZA84 ZAY8405 99.9%()Mg,Zn,AlMg -25%Y(),(1%SF6+99%CO2,)JMg,Al,ZnMg -5%YJ,740 20mi n,720

10、(,%),ZA84:Z n 7.56,AI4.21,Mg;ZAY8405:Z n7.48,AI4.05, Y0.52,Mg.10mm,15mmGleeble-500J5/s2302min. 20%,40%,60%80%,.0.0015,0.015,0.151.5s-1.Gleeble-500X(Bruker,D8ADVANCEXRD)TEM(JEOL,JEM -010)JLEICAMEF4MJ4%HNO3+96%C2H5OHJ1gHOOCCOOH+ 1mLHNO3+1mLCH3COOH+15OmLH2O22.1Mg 送n l -Y)1ZA84ZAY8405,ZA84J,(1a).0.5%YZA

11、Y8405JZA84,(1b).IPPZA84ZAY840514.8%15.0%.ZA84ZAY8405TEM(2),TEM(EDS)ZA84(A)ZAY8405B,C,D(1).(2ab)5J.ZAY8405Y0.52%(0.15%),1EDSJY0.13%,Y(0.04%)ZAY8405YZAY8405152247f4JIE41ZA84ZAY8405Fig.1Opticalmicrostructuresofas-castZA84(a)a ndZAY8405(b)TOngalloys2ZA84ZA8405TEMSAEDFig.2TEMimagesofas_castZA84(a)a ndZAY

12、8405 (b)alloys(SAEDpatternsshowthequasicrystalli nephasei neachalloy),.3ZA84ZAY8405XRD.13Elser,ZA84ZAY8405(icosahedralphase,lPhase),0.516 nm.ZA84ZAY8405(1),EDSMg38Z n43AI19Mg51Z n30AI19,12,14,15Mg-：n -M.2.2Mg -：n -M -a ;,.20%,ZA84ZAY8405,12ZA84ZAY8405EDSTable1EDSresultsofas -castZA84andZAY8405alloys

13、inFig.2(atomicfraction,%)ElementA(l -Phase)B(Matrix)C(l -Phase)D(I nterface)Mg37.8493.1251.0269.74Z n43.153.8730.1615.89AI19.012.9718.8214.24Y0.000.040.000.13Note:I-Phase icosahedralphase3ZA84ZAY8405XRDFig.3XRDpatternsofas -castZA84a ndZAY8405alloys 12:Mg Z -Y)1523EE4ZA84ZAY8405230, =0.0015s-1Fig.4O

14、pticalmicrostructuresofZA84(a,c,e)a ndZAY8405(b,d,f)alloysdeformedat230a nd0.0015s-1to =20%(a,b), =40%(c,d)and =60%(e,f),18,ZAY8405(4a,b);40%,.(4c,d);2.3Mg Zn -M -Y)60%,(4e,f).2,ZA84ZAY8405230,ZAY8405ZA84,80%,0.0015 1.5s-1,19.BaeSi ngh20,ZAY8405,.,Ag new17,21YMgc/a,.Lee,(),c+ a (Burgers.,c2+a2 11 23

15、 ) a (Burgers,a3 1120 ),.ZA84ZAY8405,152447ZAY84052.4MgNn-M -Y),Mg -Zn-AI -Y)20:(T C=(Fn R2)(h/h0)(1)0& =l n(h/h0),t c,F,R0,hh0,80%-230-10.0015s22.ZA84 ZAY8405,ZAY8405,230 ZA84,JZAY8405.ZA846ZAY8405AZ3123ZA84ZAY8405AZ31,Q o Q Q o o _nu o 20864203642 ? 11111虽 ds皤幡F1M 卑eJL0.00 20.40.6 OS 1.01.21.41jZA

16、84ZAY8405Fig.5Truestress右uestrai ncurvesofZA84(a)a nd ZAY8405(b)alloysatdi ? erentstrainrates( =80%)6ZA84,ZAY8405AZ31Fig.6PeakstressofZA84,ZAY8405a ndAZ31alloysat di? erentstrainrates(230),2.5MgNn-M -Y)J12Mg -：n iAl -Y)1525JT.Ar-rhe nius24=A1sinh( a& )nexp-Q/(RT) ,A1a；c；nJ;R,8.314J/(mol K);T;QJJ/mol

17、,(ac 1.2)J2516J=A2c nexp-Q/(RT)(4)=A3exp( Bc )exp-Q/(RT),A2,A3 B,B =na. TaylerJ，一 =ln A3-Q/(RT)+ Bcln=l nA1-Q/(RT)+nsi nh(ac )(6)ln=l nA2-Q/(RT)+nln c (7)ln &(8)c -In sln c -In s,JBn, a;sinh( aa )-1 n 77,ZA840.99466,0.971790.98499,ZAY84050.99398,0.981760.99077.,22307a,230ZA84ZAY8405 =5.2106 X 10-7ex

18、p(0.0742 a )(9) =9.6105 X 10-7exp(0.0684 a)(10)7c,ZA84ZAY8405n8.3347.762.(9)(10)1讯 j s7ZA84ZAY8405Fig.7Relatio nshipsbetwee nstrai nratea ndpeakstressofZA84andZAY8405alloysat230(a)c -In (b)ln c -In (c)sinh( ao )-ln (T =13.477ln J +194.978(11) c =14.620ln +202.561(12) (11)(12)d(T(T=13.477/ - (13)d d=

19、14.620/(14)(13)(14)JZAY8405JZAY84051526473(1)ZA84ZA8405JMg38Z n43AI19Mg51Z n30AI19, Y.ZA84ZAY8405 ,ZAY8405ZA84ZA84ZAY8405ZA84 ZAY8405AZ31 230,ZA84ZAY84058.3347.762, ZAY8405I DeckerRF.AdvMaterProcesses,1998;154(3):312LiuQ.ActaMetallSi n, 2010;46:1458(.,2010;46:1458)3LuYZ,Wa ngQD,Di ngWJ.MaterLett,200

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