Guinier-Preston Platelets Interaction with Dislocations: Study at the Atomic LevelReportar como inadecuado




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Abstract : Guinier-Preston zones, in Al-1.7 at % Cu, have been studied by means of high resolution electron microscopy. Most of the zones are atomic monolayers. Bilayers have been also observed. Observations have been carried out under 〈100〉 and 〈110〉 orientations. The shearing of a GP zone by an edge dislocation is reported. It is corresponding to one out of the three possible shearing geometries for a given glide plane. It is the one which is essentially at the origin of the chemical hardening of this kind of alloy. The other two variants for a given gliding plane seem to be soft obstacles. It is shown that the sheared GP zone which has been observed is very rich in Cu close to 100%. We know from our other results that the content in Cu can be included in a range from less than 50% to 100%.





Autor: M. Karlík B. Jouffrey

Fuente: https://hal.archives-ouvertes.fr/



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