Acta Metall Sin  1997, Vol. 33 Issue (11): 1171-1181    DOI:

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THERMAL ACTIVATION PARAMETERS OF TENSILE DEFORMATION OF GAMMA TITANIUM ALUMINIDE

WANG Yu;LIN Dongliang(The Public Laboralory of State Education Commission for High Temperature Materials and High Temperature Tests; Shanghai Jiaotong University; Shanghai 200030); C.C. Law(Materials and Mechanics Engineering; United Technologies Coporalion-Pratt & Whitney; East Hartford; CT 06I08; USA)

WANG Yu;LIN Dongliang(The Public Laboralory of State Education Commission for High Temperature Materials and High Temperature Tests; Shanghai Jiaotong University; Shanghai 200030); C.C. Law(Materials and Mechanics Engineering; United Technologies Coporalion-Pratt & Whitney; East Hartford; CT 06I08; USA). THERMAL ACTIVATION PARAMETERS OF TENSILE DEFORMATION OF GAMMA TITANIUM ALUMINIDE. Acta Metall Sin, 1997, 33(11): 1171-1181.

Abstract References Related Articles Recommended Metrics Download:  PDF(1721KB)  Export:  BibTeX | EndNote (RIS)       Abstract  Thermal activation volume V, activation enthalpy △H, activation free enthalpy △G and activation entropy △S of tensile deformation of a gamma titanium aluminide have been measured in a temperature range from low temperature(285 K) to 1273 K. The γ-TiAl has a chemical composition of Ti-47Al-2Mn-2Nb-0.8TiB2 and a microstructure of near lamellar, and the measurement was conducted at yield points. From the values and their temperature dependence of the measured activation parameters, as well as the temperature dependence of yield stress,the dislocation mechanisms of tensile deformation of the alloy have been speculated.It is found that there exist three temperature regions,which correspond to different possible thermal activation mechanisms of dislocation motion. In low temperature region(285-398K), the mechanism is mainly characterized by the overcoming of Peierls-Nabarro resistence. In intermediate temperature region(523-873K), the mechanism is a weak thermally activated process as the plastic flow is neither sensitive to temperature nor to the strain rate.In high temperature region(≥973 K), the rate controlling machanism is dislocation climbing.In addition,it is found that,activation entropy △S, whose variation with temperature is similar to that of activation volume V, also reflects the thermal activation mechanism of dislocation movement in some degree. Key words:  intermetallics      gamma titanium aluminide      tensile deformation      thermal activation      dislocation mechanism      Received:  18 November 1997      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1997/V33/I11/1171 1KimY—W.JOM,1989;41(7):24 2KimY—W.JOM,1994;46(7):30 3YamaguchiM,InuiH.StructuralIntermetallics.Warrendale,PA:TMS,1993:127 4HuangSC,HallEL.MetallTrans,1991;A22:427 5KumpfertJ,KimY—W,DimidukDM.MaterSciEng,1995;A192/193:465 6ChanKS,KimY-WMetallTrans,1993;A24:114 7MorrisMA,LipeT.ScrMetallMater,1994;31:689 8AppelF,SparkaV,WagnerR.MaterResSocSympProc,1995;364:623 9AppelF,WagnerR.In:KimY—W,WagnerR,YamaguchMeds,GammaTitaniumAluminides,TMS,1995:231 10ViguierB,BonnevilleJ.MaterResSocSympProc,1995;364:629 11ViguierB,CieslarM.MaterResSocSympProc,1995;364:653 12ViguierB,CleslarM.In:KimY—W,WagnerR,YamaguchMeds,GammaTitaniumAluminides,TMS,1995:275 13SchoeckG.PhysStatusSolidi,1965;8:499 14SurekT,LutonMJ,JonasJJ.PhilosMag,1994;A69:105 15SchafrikRE.MetallTrans,1977;A8:1003 16GuiuF,PrattPL.PhysStatusSolid,1964;6:111 17LinDongliang,Wangyu,LawCC.MaterSciEng(A),tobePublished18EzzSS,HirschPB.PhilosMag,1994;A69:105 19ConradH.JOM,1964;16:582 20HallEQ.ProcPhysSoc,1951;B64:747 21PetchNJ.JIronSteelInst,1953;174:25 22KrollS,MehrerH,StolwijkN,HerzigC,RosenkranzR,FrommeyerG.ZMettallkd,1992;83:591 23SprengelW,OikawaN,NakajimaH.Intermetallics,1996;4:185 24王瑜,林栋梁.金属学报,1997;33:1021 25JonasJJ,LutonMJ.MetallTrans,1971;2:3492 [1] TIAN Ni, SHI Xu, LIU Wei, LIU Chuncheng, ZHAO Gang, ZUO Liang. 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