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| DIRECT OBSERVATION ON DISLOCATION AND STACKING FAULT CONFIGURATION OF Ni-BASE ALLOY CONTAINING 6.5% A1 |
| HUANG Xiaoying Central Iron and Steel Research Institute;Ministry of Metallurgical Industry;Beijing |
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Cite this article:
HUANG Xiaoying Central Iron and Steel Research Institute;Ministry of Metallurgical Industry;Beijing. DIRECT OBSERVATION ON DISLOCATION AND STACKING FAULT CONFIGURATION OF Ni-BASE ALLOY CONTAINING 6.5% A1. Acta Metall Sin, 1985, 21(1): 34-149.
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Abstract An electron diffraction contrast observation on the dislocation and stackingfault structure and their movement behaviour in Ni-base alloy containing 6.5% Alwas carried out by means of TEM.The experimental results show as:1.Solution heat treatment processes with different quenching rates influencesignificantly upon the defect configuration.Under high quenching speed,a lot ofmacroholes with characteristic morphology have been observed and analyzed crys-tallographically.2.After solution heat treatment specimens suffered a certain extent of defor-mation plie-ups were observed frequently.There is a critical value of deformationto induce plie-ups in this alloy.Based on the experimental facts,a new conceptabout pile up dislocation density was suggested,which may be useful to describethe relationship between strength and microstructure of the alloy.3.Some interesting reactions of pile-ups have been analyzed and discussed.An in-situ observation of movement of extensive dislocations and the morphologyof leading partials was made by successive photograph technique in TEM.It showseven if dislocations on the same slip plane and under the same thermal stress con-dition,they may be dirived in quite different degrees,some of them extend intotwo partials,the other does not.4.The moving dislocation presented various appearances,a“bow-in”like ora“bow-out”like curve,which does not always coincide with the moving direc-tion of dislocations.This can be explained in consideration of complex stress stateassociated with them.
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Received: 18 January 1985
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1 Cotrell,A.H.,Trans.Metall.Soc.AIME,212(1958) ,192．
2 Armstrong,R.;Codd,I.;Donthwaite,R.M.;Petch,N.J.,Philos.Mag.,7(1962) ,45．
3 郭可信;林保军,物理学报,29(1980) ,494．
4 Whelan,M.J.;Hirsch,P.B.;Horne,W.;Bollmann,W.,Proc.R.Soc.(London),A240(1957) ,524．i |
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