Abstract
The (Guinier–Preston) GP1 zones were studied by means of high resolution electron microscopy and contrast simulations. In the 〈110〉 zone axis orientation, shearing of a GP1 zone by a dislocation has been observed. Different models of monolayer GP1 zones—containing 100, 80, 60, 50 and 40% Cu (balance of Al)—were used for the multislice simulations. According to the contrast analysis of throughfocus series of experimental images and other experimental data, the GP1 zones with the composition ranging from 40 to 100% Cu coexist. A simple model of a displacement field around the GP1 zone was used in simulations in order to interpret the atomic column displacement measured on some experimental micrographs.
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