کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7880617 | 1509589 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mechanisms of formation of Al4Cu9 during mechanical alloying: An experimental study
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Mechanisms of formation of Al4Cu9 during mechanical alloying: An experimental study Mechanisms of formation of Al4Cu9 during mechanical alloying: An experimental study](/preview/png/7880617.png)
چکیده انگلیسی
In spite of its complex structure, the Cu-rich γ1-Al4Cu9 compound is frequently observed in Al-Cu processing. In order to better understand the intriguing formation of this compound, a thorough experimental study of Al-25 at.% Cu mixtures produced by mechanical alloying (MA) was performed. Strong morphological changes are found to occur for moderate milling times. γ1-Al4Cu9 is formed during the early milling steps (5.5 h), its volume fraction increasing continuously with milling time, while the equilibrium θ-Al2Cu expected for this composition is detected only for longer times (90 h). Whereas the early formation of γ1 suggests that its nucleation should occur at Al/Cu interfaces, direct visualization reveals the presence of γ1 crystallites within Cu-rich zones. The thermal instability of MA-formed γ1-Al4Cu9 is evidenced, this phase evolving towards θ-Al2Cu at temperatures lower than those predicted for equilibrium conditions. These observations indicate that γ1-Al4Cu9 may be able to form through non-thermally activated mechanisms.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 87, 1 April 2015, Pages 216-224
Journal: Acta Materialia - Volume 87, 1 April 2015, Pages 216-224
نویسندگان
R. Besson, M.-N. Avettand-Fènoël, L. Thuinet, J. Kwon, A. Addad, P. Roussel, A. Legris,