naa a22 4500 510814611 CHVBK 20180411083500.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1134/S0031918X13030022 doi (NATIONALLICENCE)springer-10.1134/S0031918X13030022 Crystal structure of ultrathin lamellar precipitates [Elektronische Daten] [A. Alekseev, E. Lukina, Yu. Klochkova] The crystal structure of lamellar precipitates formed in alloys 1213 (Al-Cu-Ag), V-1461 (Al-Cu-Li) and V-1469 (Al-Cu-Li-Ag) has been studied during age hardening. The experimental studies have been performed using transmission electron microscopy. The precipitates have {111} habits and thicknesses of several atomic planes. In diffraction patterns, these plates give a system of diffuse streaks. These ultrathin plates scatter electrons similar to two-dimensional crystal lattices. It is shown that thin plates of precipitates in alloys 1213, V-1461, and V-1469 give identical systems of diffuse streaks. The two-dimensional crystal lattices that give the system of these streaks have a hexagonal symmetry with the following orientation relationship: {ie481-1} and the lattice parameter a f = 0.495 nm (there is no lattice parameter c f for two-dimensional lattices). A sequence of the steps of reconstruction of the spatial structure of plane precipitates is proposed in terms of their thickness, structures of two-dimensional lattices, and type of precipitates (extrinsic or intrinsic). The influence of Ag on the structure of lamellar precipitates in the V-1469 alloy is discussed. Pleiades Publishing, Ltd., 2013 phase transformations nationallicence low-temperature heating nationallicence Al-Li alloys nationallicence δ-phase nationallicence Ω′-phase nationallicence aging nationallicence lattice parameter nationallicence X-ray diffraction analysis nationallicence TEM nationallicence Alekseev A. All-Russia Scientific Research Institute of Aviation Materials, ul. Radio 17, 105005, Moscow, Russia aut Lukina E. All-Russia Scientific Research Institute of Aviation Materials, ul. Radio 17, 105005, Moscow, Russia aut Klochkova Yu All-Russia Scientific Research Institute of Aviation Materials, ul. Radio 17, 105005, Moscow, Russia aut The Physics of Metals and Metallography SP MAIK Nauka/Interperiodica 114/6(2013-06-01), 481-487 0031-918X 114:6<481 2013 114 11508 https://doi.org/10.1134/S0031918X13030022 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0031918X13030022 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Alekseev A. All-Russia Scientific Research Institute of Aviation Materials, ul. Radio 17, 105005, Moscow, Russia aut NATIONALLICENCE 700 1- Lukina E. All-Russia Scientific Research Institute of Aviation Materials, ul. Radio 17, 105005, Moscow, Russia aut NATIONALLICENCE 700 1- Klochkova Yu All-Russia Scientific Research Institute of Aviation Materials, ul. Radio 17, 105005, Moscow, Russia aut NATIONALLICENCE 773 0- The Physics of Metals and Metallography SP MAIK Nauka/Interperiodica 114/6(2013-06-01), 481-487 0031-918X 114:6<481 2013 114 11508 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer