کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7969146 | 1514346 | 2018 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of trace amounts of added Sc on microstructure and mechanical properties of 2055 aluminum 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 effects of Sc additions and isothermal aging on the microstructure and mechanical properties of 2055 aluminum alloy have been investigated. The isothermal aging temperatures investigated were 175â¯Â°C and 200â¯Â°C. Results show that the aging temperature does not affect the type of precipitates in both Sc-free and Sc-added 2055 Al alloys. While remarkable changes in the size and number density of T1 (Al2CuLi) precipitates have been observed. For samples aged at 175â¯Â°C for 8â¯h, the average length of T1 precipitates was increased from 39.9â¯nm to 45.6â¯nm, the number density decreased from 5.77â¯Ãâ¯1022â¯mâ3 to 3.68â¯Ãâ¯1022â¯mâ3 after Sc addition. On the contrary, when samples were aged at 200â¯Â°C for 8â¯h, the length decreased from 59.89â¯nm to 43.32â¯nm and number density increased from 2.13â¯Ãâ¯1022â¯mâ3 to 3.00â¯Ãâ¯1022â¯mâ3 by adding trace Sc. Slight deterioration of tensile strength and yield strength with higher ductility was founded at the aging temperature of 175â¯Â°C for 8â¯h due to the larger size and lower number density of T1 precipitates along with the formation of a W (AlCuSc) phase during the casting or homogenization processes. When aging temperature increased to 200â¯Â°C, tensile strength and yield strength were significantly improved by Sc addition without losing ductility. Highly dense fine T1 precipitates take responsible for the strength improvement, and to some extent it compensated the strength loss caused by the formation of W phase. A “vacancy-prison” mechanism was adopted to explain the effect of Sc additions on the precipitation of T1 phase as a function of aging temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 141, July 2018, Pages 248-259
Journal: Materials Characterization - Volume 141, July 2018, Pages 248-259
نویسندگان
Bo Jiang, Danqing Yi, Xiaoou Yi, Feng Zheng, Haisheng Wang, Bin Wang, Huiqun Liu, Zhan Hu,