کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1574410 1514712 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Formation and reversion of clusters during natural aging and subsequent artificial aging in an Al-Mg-Si alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Formation and reversion of clusters during natural aging and subsequent artificial aging in an Al-Mg-Si alloy
چکیده انگلیسی
The continuous changes in number density, size distribution and chemical composition of clusters during natural aging (NA), and subsequent artificial aging (AA) at 443 K, in an Al-0.62Mg-0.93Si (mass%) alloy have been evaluated using atom probe tomography. The data show almost no change in the average size and Mg/Si ratio (at% ratio) of clusters during NA. The highest hardness and most-dense clusters, following NA, and the largest drop in hardness, during AA for 1.2 ks, are observed in the material with the longest NA period. In contrast with the published literature, which suggests that only small clusters revert into solution, the number density of clusters decreased, with no dependence on the cluster size, during AA for 1.2 ks, resulting in a slight decrease in the average radius of clusters. Things to be emphasized are that the number density of clusters with the Mg/Si ratio below 0.4 stays pretty much the same during AA, whereas other clusters decrease during the first 1.2 ks and then increase again during the prolonged AA for up to 3.6 ks. This work is the first to reveal that the typical Si-rich clusters can neither be dissolved nor grow further, although the size is small. In other words, it is believed that the typical Si-rich clusters can lead to the retardation of the hardness increase during AA called as negative effect of NA.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 631, 17 April 2015, Pages 86-96
نویسندگان
, , , ,