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47 4 Vol.47No.42011 4 462—468 ACTAMETALLURGICASINICAApr.2011pp.462–468 Æ ∗ ( , 110016)( , 100095) ( , 110023)! . , TC11 890—995 0.01—10s−1 . α/β (α ) Hall–Petch .TC11 Hall–Petch . TC11 , , ,Hall–Petch #$ % TG146.2&’ ()A&* 0412−1961(2011)04−0462−07FLOWSOFTENINGMECHANSIMOFATiALLOYWITHLAMELLARSTRUCTUREDURINGSUBTRANSUSDEFORMATIONSONGHongwu,ZHANGShihong,CHENGMingInstituteofMetalResearch,ChineseAcademyofSciences,Shenyang110016LIZhenxi,CAOChunxiaoBeijingInstituteofAeronauticalMaterials,Beijing100095BAOChunlingTitaniumAlloyDivision,ShenyangResearchInstituteofFoundry,Shenyang110023Correspondent:ZHANGShihong,professor,Tel:(024)83978266,E-mail:shzhang@imr.ac.cnSupportedbyNationalBasicResearchProgramofChina(No.51319)Manuscriptreceived2010–10–11,inrevisedform2011–01–22ABSTRACTTheflowstresshasaconsiderableflowsofteningafterapeakstrainhardeningatverylowstrainsforTialloyswithlamellarstructureduringsubtransusdeformation.Inordertostudythemechanismofsuchflowsofteningbehavior,thedeformationbehaviorofTC11Tialloywithalamel-larstructurewasstudiedusingisothermalhotcompressiontestsunderatemperaturerangeof890—995 andastrainraterangeof0.01—10s−1.TheoreticalcalculationshowstheHall–Petchstrength-eningeffectsinducedbyα/βinterfaceaswellasthetwinboundaryinαlamellararefarmoresignif-icantthanthatofthecolonyboundary.TheflowsofteningcanberelatedtoreductionofHall–Petchstrengtheningeffectsduetotransferfromthehardslipmodetothesoftone.KEYWORDSTC11Tialloy,subtransusdeformation,flowsoftening,Hall–Petcheffectα+β ! # $,# ! %&. ’ ( %&, ! ) * * + ,-##51319 ! :2010–10–11, $ :2011–01–22./!$: %,%,1981 , DOI:10.3724/SP.J.1037.2010.00534β && ,)’ ##0 Æ$%&.12%& ’(%, &’3)&& (( $4 * .)%)β 5& α+β ) ##0, #’+*) 6##!Æ$%&, ’(( +7%&.&,3+7%& , ’&&+** .)*β *, ’+* 6) -.(-, + ’(,#,$-%&*’%/8.%α+β ) ,9:) *+(-,.&Æ$%& + ’(%,) ##0#,/’0.(/,)) ’’,%&),($4,’ 4 *-00: +1;11,22-32../03134634,$-%&’% /8.)%, !$-2## %&’% /8, # 43 4 4,=5 !5 Æ$%&6 ) 57.6 ) & 586)6/ !78 9?. 200:70179 &,Ti–6Al–4V;Ti–6242(Ti–6Al–2Sn–4Zr–2Mo–0.1Si) Æ$%& ) & ! 758[1−6].58Æ-,:=Æ$%& Ti–6Al–4V;Ti–6242 )6 ) 8.–8)298)3:(9:4! ;5 @,6 8.)(; 8)(0.1):: =A,7&8.88) B C=:,;-9,-=,)9,5?88)B %@;,)8)(*(0.8);- :;.?58Æ-,Æ$%& 9, #+DD*:+7%& )?) @ : 9,#+.6:=Æ$%& A ,3IMI834[7]*TC11[8−11]+, ) & 58Æ?=A,;5@,*AB 9, Æ$%& 6 ) =(E.. 58[8−11] &B9,F)@Æ ) C8?Æ$%&+7,*Æ$ DG) (.8&Semiatin+[3,12−15] 58Æ?=A,) C8?Æ$%&+7,*&A E,69, FGB;,@’ 9,Æ’ H F).%Æ$DG69, I3BCAAD?[5].5&9: Æ$%&9,57 58 Æ$%& ÆA(9@A,/’!62’? 5BHE. 2B9, /’@Æ Æ$CCBFC GDDD) [6]; 2E IEEJJ#α/βÆ$FHF(Hall–PetchC8 F, 9,/’ 57[15].GH?625B8)KK[16]@)’ I,G 25B3 H CCBFC GDDDII $LLI,J(F 7 7JGJÆ?;GH25B6α/βÆ$FHCHall–PetchK,C8&&!7JGJ,Æ??$LÆ?K(KL,J@M=Æ %&6 4L 57&& 7 LA.Æ$%& 9,57 GM=7 EM,MM6TC11 6 9,& &&58, #9,#+ 7JGJ,Æ %& H,IN9,/’ ##*57.1+,MN$LN4O3PNJON458O43 6TC11 Q4,,O I(PPIN,%) :Al5.8—7.0,Mo2.8—3.8,Zr0.8—2.5,Si0.2—0.35,Fe≤0.25,C≤0.1,N≤0.05,H≤0.05,O≤0.15,TiQP.Q49! Q 6*6 K ,O3)* LRM(α+β)/βR)*+(N)9)S 1000—1020S. ! $L Æ$%&,BF&Q4 )9PH20S(1040S),T*30minR’TO*, %&PDUS(SEM)UÆ3Q1 Q.2%& VR Æ$%&,(E SF&βTU(WX 400—500μm) TF=Y*αÆ$TB,F&βTU9OPαCC% ,CCR QS&VUT αÆ*βÆ,’?CCRαÆ$ SR+S 1.5μm,βÆ$ SR+S 0.3μm.-1W1040 ,30minÆ Z [ TC11 SEMVFig.1SEMimageoflamellarstructureofTC11alloyachievedbytreatmentat1040\holding30minO376]+*WX$L58TC11 Æ$%& )*) & .O39DS TLS C7& Q 7YDUÆV UQ,7&Q^_*X_ WE10mm,‘12mm WXVZ,+* WX$L)Glee-ble3500R *WVL5H&&.) *+V[ \XaUTC11 6 6 & *# *+/8, \X *+ 890,920,950,980*995S;$LO3W8)5?WX) , \X 8)5? 0.01,0.1,1*10s−1,XY!6 6 ]W5 b+H Xc 68 8)5?V[;) P60%,Y*5?5S/s,T*Z3min;VZWX&Zd;’TO*PTY)*) %&. %&(OM) H)Axovert200MAT B SH&&,63SiscIASQ^IN 7(V8e)&&MP IN( ZÆ$R+*TUWX RP);PDUS(SEM)IN)SSX–550RPDUYB SH_ .‘[US(TEM) TECNAI20R, IUW200kV.US H3Z\O3]^U5L8c, 3 ]^U5] I(a’IN) :64%CH3OH+30%C4H10O+6%HClO4,U5@ ]f’ –30S,UW30V.2+,.Z+*WX$L TC11 Æ$%&6 ) [8.–[8)293Q20 $9 Q.9Q[\,’?) @ :8.88) B ;-? 4464]4_4b4g 47 -2TC11 hÆ c^d \ –\ ‘e(f]ge W $^[ a_)Fig.2Compressedtruestress–truestraincurvesofTC11alloyatdifferenttemperaturesandstrainrates0.01s−1(a),0.1s−1(b),1s−1(c)and10s−1(d)(dottedlinescorrespondtothedataaftercorrectionoftemperaturearisinginducedbydeformation)),:;.8.! 88) B %h5B ,;- @, (9;) M8)L-=A, Q0[P‘L=A8)\ ;(S 0.05);5&8_8) ]B ,8. &:,;-a9, (E;)8)(*,=:: :;, Q0[P‘L,)-8)5?(0.01s−1)) ,8),#0.7bL-!,8)5?()(0.1—10s−1),b7)8) 0.9,c=- 9,,J[P‘L88) B 8.- #+J)J;,6=:: :;.9Q2[P‘L,8.6*+*8)5?\ c^:)?) *+:,8.88)5? B*%4),=ATC11 ‘8)5?c^N4;)?8)5?,8.8*+ Y)%-,=ATC11 _*+c^N4,)6) ((( )8)5?) )/’ ) C8‘6H? 9,-=d MI3.9:)8)5?:8) ) C86 ) *+Y),%) *+68. FGa(*, !abAD?8.? .OaN5Z 9 , 6) ##0*YF( 8.),&&i‘.WX) ## *Y[O3:eGJ[17]:ΔT=ηβσdερc(1)e0,ΔT *YA,η d )Y,β ) bR) ) iIN,σ [$8.,ε [$8),ρ e+,c K .6:TC11 ,ρ=4.5g