The disordered structure of Q′ and C phases in Al–Mg–Si–Cu alloy. (June 2016)

• Record Type: Journal Article
• Authors: Ding, Lipeng; Hu, Hai; Jia, Zhihong; Weng, Yaoyao; Wu, Xiaozhi; Liu, Qing
• Is Part Of: Scripta materialia. Volume 118(2016)
• Page Start: 55
• Page End: 59
• Publication Date: 2016-06
• Subjects: Aluminum alloys -- Precipitate -- Disordered -- High angle annular dark-field scanning; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2016.03.011
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The disordered structures of the Q′ and C phases in the over-aged Al–Mg–Si–Cu alloy were studied by the atomic resolution high-angle annular dark-field scanning transmission electron microscopy and density functional theory calculations. A Cu cluster-like zone is found in both the well-ordered and disordered regions of the disordered precipitates, which acts as a stable skeleton of these phases. The statistic result shows that the C phase is more preferential to produce disordered structure than the Q′ phase. The mechanism for forming the highly disordered C phase is attributed to the relatively weak metallic bonding between the Al–Si1 and Mg2–Si1 atoms. Graphical abstract: