The disordered structure of Q‿and C phases in Al-Mg-Si-Cu alloy

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• 作者：Lipeng Ding^a ; Hai Hu^b ; Zhihong Jia^a ; ^{zhihongjia@cqu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yaoyao Weng^a ; Xiaozhi Wu^b ; Qing Liu^a
• 关键词：Aluminum alloys ; Precipitate ; Disordered ; High angle annular dark-field scanning
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：118
• 期：Complete
• 页码：55-59
• 全文大小：1452 K

文摘

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.