کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5456258 | 1514656 | 2017 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Development of a high temperature high strength Al alloy by addition of small amounts of Sc and Mg to 2219 alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The paper reports a significant improvement in tensile properties, in particular at 200 °C, of commercial 2219 Al alloy by addition of small amounts of Sc (0.8 wt%) and Mg (0.45 wt%), and employing copper mould suction casting followed by natural ageing and cold rolling. Microstructural examination and measurement of hardness were performed in order to explain the effects of Sc and Mg at each processing step. It is found that the remarkable improvement of room temperature strength occurs due to fine grain size, Al3Sc and Al3(Sc,Zr) dispersoids, GP zones on {100} and {111} planes, and work hardening. On exposure at 200 °C, the GP zones transform primarily to θⲠprecipitates and a few Ω precipitates. Sc and Mg atoms segregate at the θâ²/matrix interface, which suppress the coarsening of θⲠprecipitates and make them stable at higher temperatures. Thus, the work reports extremely high 0.2% proof stress of 542 MPa at room temperature, 378 MPa at 200 °C and 495 MPa at room temperature after 200 h exposure at 200 °C accompanied by reasonable ductility. Theoretical yield strength is calculated on the basis of the observed microstructure and is found to be in good agreement with the experimentally obtained value.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 687, 27 February 2017, Pages 221-231
Journal: Materials Science and Engineering: A - Volume 687, 27 February 2017, Pages 221-231
نویسندگان
S. Mondol, T. Alam, R. Banerjee, S. Kumar, K. Chattopadhyay,