کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1639659 1517056 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of pre-aging on precipitation behavior of Al-1.29Mg-1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Zn-0.1 Ti alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Effect of pre-aging on precipitation behavior of Al-1.29Mg-1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Zn-0.1 Ti alloy
چکیده انگلیسی

By means of Vickers-hardness and electrical conductivity measurements, DSC tests and TEM analyses, the effect of different pre-aging treatments on precipitation characteristic of the Al-1.29Mg-1.22Si-0.68Cu-0.69Mn-0.3Fe-0.2Fe-0.1Ti (mass fraction, %) alloy during subsequent artificial aging was investigated. The results indicate that with increasing pre-aging time from 2.5 min to 10 min at 170 °C, the number of formed β” nuclei increases, resulting in promoting artificial aging kinetics and enhancing peak hardness. The hardness of pre-aged alloy reduces within lower temperature range of non-isothermal aging and increases in early stage of isothermal aging at 170 °C. The size and density of clusters in pre-aged samples determine the hardenability in early stage of artificial aging. Pre-aging has dual mechanisms: namely, clusters (β” nuclei) formed by pre-aging can inhibit the precipitation of GP zones during natural aging, and can quicken the precipitation of β” phase in the early stage of subsequent artificial aging.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 16, Issue 4, August 2006, Pages 917-921