喷射沉积铝合金

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1、HightemperaturedeformationbehaviorandmechanismofspraydepositedAl-Fe-V-SialloyXIAOYu-de(肖于德),WANGWi(e王伟),LIWen-xian(黎文献)SchoolofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,ChinaReceived15July2007;accepted10September2007Abstract:Al-8.5Fe-1.3V-1.7Sialloywasprepar

2、edbyspraydepositionandhotextrusion.Thehightemperatureplasticdeformation−4−2−1behaviorofthespraydepositedAl-8.5Fe-1.3V-1.7Sialloywasinvestigatedinthestrainraterangeof2.77×10−2.77×10sandtemperaturerangeof350−550byGleebe℃-1500thermomechanicalsimulator.Themechanismofthehightemperatureplas

3、ticdeformationofthealloyswasstudiedbyTEMassociatedwiththeanalysisofRosler-Artzphysicalconstitutiverelationshipbasedonthemodelofdislocationdetachingfromdispersionparticles.TheresultsshowthatAl-Fe-V-Sialloyhaslowstrainhardeningcoefficient,andevenexhibitsworksoftening.Stressexponentnanda

4、ctivationenergyQwerecalculatedbasedonZener-HollomonrelationandRosler-Artzphysicalmodelrespectively.TheRosler-ArtzphysicalmodelcangiveagoodpredictionfortheabnormalbehaviorofhightemperaturedeformationofspraydepositedAl-Fe-V-Sialloy,thatis,nlargerthan8andQhigherthan142kJ/mol.However,beca

5、useofthehighlyrefinedmicrostructure,thehightemperaturedeformationbehaviorofspraydepositedAl-Fe-V-SialloydeviatesmoreorlessfromthelawpredictedbyusingRosler-Artzphysicalmodel.Keywords:spraydeposition;heat-resistantaluminumalloy;constitutiveequation;hightemperatureplasticdeformation;stre

6、ssexponent;activationenergy;dislocationdetachmentandmechanism,suchasAnsell-Weertmanmodel,critical1IntroductionstressmodelandRosler-Artzphysicalmodel,havebeendiscussedrecently[13−20].Ansell-WeertmanreportedRapidlysolidifiedAl-Fe-V-Siheatresistancethatdislocationcanclimbthedispersedpart

7、iclesorloopaluminumalloyisakindoflight-massstructuraltheparticlesaccordingtoOrowanmechanism,asaresult,materialswithhighspecificstrength,highspecificthesizeofthedispersedparticlesinfluencedthecreepstiffnessandgoodheat-resistance[1−5].Itisabletobeprocessdirectly.Incriticalstressmodel,MI

8、SHAet