کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11263116 | 1781703 | 2019 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of Cu and Mn content on solidification microstructure, T-phase formation and mechanical property of AlCuMn alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Solidification microstructure of two AlCuMn alloys (Alloy-1: Al-1.6Cu-0.3Mn, Alloy-2: Al-2.2Cu-0.8Mn) and their precipitation behavior during solutionizing and aging treatments were investigated by optical microscopy, X-ray diffraction, Scanning and Transmission Electron Microscopies. The influence of Cu/Mn content and ratio on mechanical properties was also discussed in this study. Results reveal that Cu/Mn content and ratio have considerable influence on the solidification microstructure of these alloys. In Alloy-1 with low Cu/Mn content and ratio, only small amount of θ-CuAl2 and T-phase (Al20Cu2Mn3) are formed within the interdendritic regions and grains boundaries during solidification. But in Alloy-2 with high Cu/Mn content and ratio, a great amount of bone-like and round multiphase structure is observed in interdendritic regions, which consists of α-Al, θ-CuAl2 and Al13Cu4Mn3 phases. The Al13Cu4Mn3 phase in multiphase structure is demonstrated to be an icosahedral quasicrystalline phase (I-phase). The formation of I-phase in a conventional casting of AlCuMn alloy is related to the stabilizing effect of Fe. Cu/Mn content and ratio also have considerable influence on precipitation behavior of AlCuMn alloy during solutionizing and aging treatment. In Alloy-2, two morphologies of T-phase are formed: large particulate one is transformed from the instability decomposition of I-phase at high temperature and the fine rod-like is precipitated from supersaturated Al solid solution. And further aging does not lead to new precipitates. At each test temperature, both the YS and UTS of Alloy-2 are higher than that of Alloy-1 which is related to the formation of a great amount of T-phase particles during solution treatment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 774, 5 February 2019, Pages 758-767
Journal: Journal of Alloys and Compounds - Volume 774, 5 February 2019, Pages 758-767
نویسندگان
Soban Muddassir Dar, Hengcheng Liao, Aiqun Xu,