کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1639611 1517043 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microscopic phase-field simulation for precipitation behavior of Ni-Al-Cr alloy during two-step aging
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Microscopic phase-field simulation for precipitation behavior of Ni-Al-Cr alloy during two-step aging
چکیده انگلیسی

Based on the microscopic phase-field model, the pre-aging temperature effects on the precipitation mechanism and microstructure evolution during two-step aging for Ni75Al9Cr16 alloy were simulated. The results show that the early precipitation mechanism of L12 phase is the mixed mechanism of spinodal decomposition and non-classical nucleation growth, whereas the early precipitation mechanism of DO22 phase is spinodal decomposition when the pre-aging temperature is 873 K. The early precipitation mechanism of L12 phase is non-classical nucleation growth, whereas the early precipitation mechanism of DO22 phase is spinodal decomposition when the pre-aging temperature is 973 K. Under the effects of elastic strain energy, the cubic particles exhibit directional alignment along [100] and [010] directions during the late precipitation, which is more obvious at lower pre-temperature. DO22 phases appear earlier than L12 phases under these two kinds of precipitation processes; and the nucleation incubation time becomes long with the increase of pre-temperature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 18, Issue 4, August 2008, Pages 930-937