ࡱ> 130~q` R86bjbjqPqP2N::}%tXXXX8,@tX5j:""""4444444$6h*9N4Q$"""$$4XXs5Q,Q,Q,$X4Q,$4Q,Q,:0,T1 ()_1 3|(50X5i1Rx9G+91x949$1d">",Q,#$?#F"""44+^"""X5$$$$DXXXXXX DNNefNQ_7h1.  Xd S_7h-NeXd~400W[]S YeXd~250*N[͋]S JSV`ZA12TёAmS'`xvzXd ,ge(uLx6Rvؚ)n TtSR{AmSN xvzNJSV`ZA12TёvAmS'`0[JSV`ZA12TёvjRR^RNesQ|f~TnVsۏLNKmՋTRg0~ghfJSV`ZA12TёwQ gS'` vQS'`v'Y\NVvRpeTjRRs gsQ0(W3z`Tw`vN TagN N JSV`ZA12FmmhsQN TvAmSOyr_0(W3z`agN N JSV`ZA12Tёvh‰Ϟ^jRRsvXR NM HTsQGPQX'`vAmSyr'` (Ww`agN N vQh‰Ϟ^jRRsvXR X'Y HTsQAm'`vAmSyr'`0gT 9hncw`agN NvՋ~gNSAmSf[t ^zN^[E]QagNvZA12TёvR`AmS!jW0sQ.͋JSV` ZA12Tё S'` AmS'` h‰Ϟ^ AmS!jWA STUDY ON THE RHEOLOGICAL BEHAVIOR OF SEMI-SOLID ZA12 ALLOYAbstractIn this thesis, the rheological behavior of semi-solid ZA12 alloy was investigated using a specially designed high temperature Couette rheometer.The evolution of shear stress with time and the hysteresis loops of semi-solid ZA12 alloy were measured and analyzed. The results show that semi-solid ZA12 alloy possesses the thixotropic property, which varies with solid fraction and shear rate. In addition, the semi-solid ZA12 alloy slurry exhibits different rheological behaviors under steady state and transient state conditions. In case of steady state, the apparent viscosity of semi-solid ZA12 alloy decreases with the increase of shear rate, showing the pseudo-plastic rheological behavior. However, under the transient state condition, it presents the dilatant rheological behavior, i.e. the apparent viscosity increases as shear rate increases.Finally, based on the transient state experimental results and rheology theory, a dynamic rheological model of semi-solid ZA12 alloy was developed, which could be applicable to practical semi-solid processes.KEY WORDS: semi-solid, ZA12 alloy, thixotropic behavior, rheological behavior, apparent viscosity, rheological model3.  vU_ S_7hv U_Xd & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & `!Abstract & & & & & & & & & & & & & & & & & & & & & & & & & & & & & a!~ & & & & & & & & & & & & & & & & & & & & & & & & & & & 11.1 _ & & & & & & & & & & & & & & & & & & & & & & & & & 11.2 JSV`TёAmS'`xvzsr & & & & & & & & & & & & & & & & & 21.3 KmՋAmS'`v8^(uel & & & & & & & & & & & & & & & & & & & 51.3.1 (u TtSR{_|^KmՋAmS'` & & & & & & & & & & & 51.3.2 GrlKmՋAmS'` & & & & & & & & & & & & & & & & & 61.4 ,gevxvzvvT;NxvzQ[ & & & & & & & & & & & & & & & 8ՋYSՋel & & & & & & & & & & & & & & & & & & & & & 102.1 ؚ)nAmSNSvQpencǑƖ|~ & & & & & & & & & & & & & & & & 102.2 SpeKm[ & & & & & & & & & & & & & & & & & & & & & & & & 15& & & & & & & ~ & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & 110" & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & & 111Se.sReferences & & & & & & & & & & & & & & & & & & & & & & & 112 40 cke S_7hckeW[pe1.52NW[ ~ 1.1 _N, Tё(Wck8^agN NQV @bNuv~~'YY:Nhgr~g0gvfgvb_b OQV-NvTё(WVvRpe20e 1\_Y'N1Y[‰AmR'` Vdk(Wck8^QVagN NfQs)~g0[‰OPgI{N{|v :w070t^NSU\wegvJSV`Tёbb_b/g/fPgeSvQbb_WvN'YSi ]nS0RNNv͑Ɖ0& & 1.2 JSV`TёAmS'`xvzsr:NN[~bc6RJSV`Tёbb_vgsO]zagN HQ_{[JSV`Tёv,gg'`ۏLmeQxvz vQ-NSb[JSV`TёFmmv~~r`bQ(WSϑYVvRpe VSO|P[v:\[0b_` Vv||Z z^Tё^\Fmmv|^I{ (W)n^TRSsI{Y(WSϑq_T NvSSĉ_& & 0& & 1.3 KmՋAmS'`v8^(uel1.3.1 (u TtSR{_|^KmՋAmS'`& & 1.3.2 GrlKmՋAmS'`& & 1.4 ,gevxvzvvT;NxvzQ[~ N@b xvzN[JSV`TёvAmSL:NۏLN'Yϑvxvz FO'YRxvz~g/f(W3z`agN N_v sSAmSf~/fR`[jRRpeASRT_0Rv0& & 50 Vh S_7h EMBED Designer.Drawing.8 V2-1 TtSR{AmSN~g:yaV SHAPE \* MERGEFORMAT ,.`bdf  P c l m DH;ͯ͟xtmgmgtt^th0OJQJo( h0CJh0CJo(h0h0CJOJPJo(h0CJ\aJh0CJ\aJo(h0CJaJh0CJaJo(h0CJo( h0CJh0OJPJo(h0CJOJPJQJaJo( h0o(hdh8!{56CJ\]o(hdh8!{CJo(h05CJ\h05CJ\o($dfX   R _ ! WD`gd0 WD`gd0$a$gd0gd05N566F&pF jl|p 7WD`7gd0 WD`gd0 & Fgd0gd0$a$gd0H\^"$.HJlnx  BDNl(4dhlz|"68:hprth8!{h|k56CJ\]o(h05CJ\o(h05CJ\h0OJQJh0OJQJo(h0 h0o(F(, 2>\^bp:<@DFXZ\ҿҳҳҪҳҪҳҪ֎ֆjh0Uh05CJ\o(h0CJOJQJh0OJQJh0OJQJo( h0o(h0CJo( h0CJh0CJo( h0CJh0h05CJ\h8!{h|k56CJ\]o(h8!{h8!{56CJ\]o(102^d<BZ$a$gd0 iWD`igd0gd0 WD`gd0 WD`gd0gd0 $ & Fa$gd0,",&,(,V,X,Z,\,,,,,,,,,,,- --- -"-$-&-0-4-d.f.h.v....../"0$0&0N0ܱܙh0mHo(sHh05CJ\o(h05CJ\ h0H*o(j~0h0U$jI h0CJKHUVaJo(Uj/h0Ujh0UmHnHuh0 h0o(jh0U$jSI h0CJKHUVaJo(4$,^,~,,,,,,b$IfWD`bgdr $$Ifa$gdr`gd0 $`a$gd0$a$gd0 V2-3 AmSN|~]\OAm z:yaV  EMBED Origin50.Graph V3-2 5uSOSNmbwsQ|h4-1 N TVvRpeTRSsagN NvnNAVvRpefsRSs ( S-1)245 S-1 <  d" 470S-1470 S-1 <  d" 700S-1nAnA0.151.30.041.820.002360.211.310.081.820.00370.541.30.151.820.00450.651.290.281.820.00540.711.280.161.820.0072 60 Se.sReferences  _7hSe.sReferences [1] R Kopp, D Neudenberger, G Winning. Different Concepts of Thixoforging and Experiments for Rheological Data [J]. Journal of Materials Processing Technology, 2001, 111: 48-52[2] T J Chen, Y Hao, J Sun. Microstructural Evolution of Previously Deformed ZA27 Alloy during Partial Remelting [J]. Materials Science and Engineering A, 2002, 337:73-81[3] s`iRQVTёv>f_~~TAmS'`[D][ZSXf[MOe]WSNNWS'Yf[:gh] z| 1988[4] ggt^ AmSf[[M]T\nT\n]N'Yf[QHr>y 19911-3[5] R Kopp, et al. Thixoforging--basic Experiment and Optimized Tool Design[C]. In: Proceedings of the Fifth International Conference on Semi-solid Processing of Alloys and Composites. Golden, CO, 1998. 165-172[6] M Modigell, J Koke. Time-dependent Rheological Properties of Semi-solid Metal Alloys [J]. 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