โ Scribed by P.H. Pumphrey; J.W. Edington
No coin nor oath required. For personal study only.
The structure of the semicoherent interface between gram boundary nucleated JI,,C!, and the related austenite gram has been studied in a 90 '$~Cr-~5ยฐ0Si-0.05~oC stainless steel. Transmission electron microscope observations of the direction of Moire fringes, as a fimction of the operative reflection, have shown that for some particles there is a 0.6" twist deviation from the previously reported exact cube/cube orientation relationship. In contrast, other particles have no twist component.
Bright field kinematical imaging conditions have revealed networks of interfacial defects which have been interpreted as dis. locations with a/3 (111) Burgers vectors. The spacing and crystallographic directions of these dislocations account well for the precipitate/matrix relationship in both the cube/cube precipitates ancl those with a twist component.
La structure de l'interface semi-coherent entre ICI&, ayant pris naisaance dans un joint de grains et le gram d'austinite qui lui correspond a bte Btudiee dans un acier inoxydable !20y0 Cr-B5ยฐ/0 Xi-0,050; C Les observations au microscope electronique en transmission de la direction des franges de moire en fonction de la reflexion utilisee ont montre que, pour certaines particules, il se produit une torsion de 0.57' B. partir de la relation d'orientation exacte cube/cube observee anterieurement.
Au contraire, lea eutres particules n'ont aucune composante de torsion. Des reseaux de defauts dans les interfaces ont Bte mis en evidence dans des fends claim en conditions cinematiques.
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