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1、AcrametaN.Vol.37,No.11,pp.3099-3105,1989OOOl-6160/89$3.00+0.00PrintedinGreatBritain.AllrightsreservedCopyright01989PergamonPressplcDISLOCATIONSTRUCTUREDUETOHIGHTEMPERATUREDEFORMATIONINy’PHASEOFANICKEL-BASESUPERALLOYDONGLIANGLIN(T.L.LIN)andMAOWENDepartmentofMaterialsScien
2、ceandEngineering,ShanghaiJiaoTongUniversity,Shanghai,China(Received28November1988)Abstract-Thedislocationstructuresofdirectionallysolidified(DS)RenC80superalloyiny’phaseduringtensiledeformationat760°Cand850°Candduringcreepdeformationat760°Cunderastressof618MPahavebeenstu
3、diedbytransmissionelectronmicroscopy.Ithasbeenshownbyanextensiveanalysisofthedislocationsboundingasuperlatticestackingfaultthaty’shearingoccursbyviscousslipofpairsofSISFseparated+(112)superpartials,butthef(110)screwcomponentsofthemhavemovedawayfromtheb(112)edgecomponents
4、on[l1l]plane,leavingastressstabilizedAPBinitswakeintensiledeformation.Incontrasttothetensileglidemechanism,increepdeformationy’shearingoccursbyviscousslipofpairsofSISFseparatedf(112)superpartialswithnetslipvector(110)whilethecoresofthef(112)superpartialsdonotseparateobse
5、rvably.RCum&NousavonsttudieparmicroscopicClectroniqueentransmissionlesstructuresdedislocationsdanslaphasey’dusuperalliageRenC80&labor6parsolidificationdirigeeetdeform&soitentractiona760°Ceta85o”C,soitenfluaged760°Csousunecontraintede618MPa.Uneanalyseapprofondiedesdisloca
6、tionsquibordentunefauted’empilementdesurstucturemontrequelecisaillementdey’alieuparleglissementvisqueuxdepairesdesuperpartiellesSISFl/3(112)dissociees,maisqueleurcomposantesvisl/2(110)sesontdtplac&esparrapportauxcomposantescoinl/6(112)dansunplan{111)enlaissantdansleursil
7、lage,entraction,uneparoid’antiphasestabilisieparlacontrainte.Contrairementaumecanismedeglissemententraction,lecisaillementdey’enfluagealieuparglissementvisqueuxdepairesdesuperpartiellesSISFl/3(112)dissocites,ayantunvecteurglobaldeglissement(110)alorsquelecoeurdessuperpar
8、tiellesl/3(112)nestpasdissociidefaGonobservable.Zusammenfasaung-DieVersetzungsstrukturindery’-Phasederg
