TEM diffraction study of Al2CuMg (S′/S) precipitation in an Al–Li–Cu–Mg(Zr) alloy

Autor:	H. Djaaboube, D. Thabet-Khireddine
Rok vydání:	2012
Předmět:	Diffraction Crystallography Materials science Precipitation (chemistry) Transmission electron microscopy Phase (matter) Alloy engineering Orthorhombic crystal system Zr alloy Selected area diffraction engineering.material Condensed Matter Physics
Zdroj:	Philosophical Magazine. 92:1876-1889
ISSN:	1478-6443 1478-6435
DOI:	10.1080/14786435.2012.659288
Popis:	Transmission electron microscopy (TEM) was used to study the precipitation in an 8090 (Al–2.7Li–1.4Cu–1Mg–0.11Zr (wt %)) alloy. TEM diffraction patterns revealed reflections from the orthorhombic S′/S (Al2CuMg) phase in addition to those of the fcc α matrix, the coherent and ordered δ′(Al3Li) phase of L12 structure and the hexagonal T1 (Al2CuLi) phase. The reflections from the T1 phase were identified and indexed using literature results. Concerning the S′/S phase, a theoretical study, based on its orientation relationships with α, allowed the construction of transformation matrixes between planes and directions of their reciprocal lattices. The calculation shows that 12 different S′/S systems can diffract on a given α phase selected area diffraction (SAD) pattern. Theoretically, two diagrams ( and ) are considered, on which the S′/S reflections are indexed. The results obtained for the theoretical patterns are in good agreement with those observed experimentally.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::295e4951110c5181176ae8349c9287a5 https://doi.org/10.1080/14786435.2012.659288 Zobrazit plný text záznamu