کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1613122 1516311 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
First-principles study of Mn, Al and C distribution and their effect on stacking fault energies in fcc Fe
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
First-principles study of Mn, Al and C distribution and their effect on stacking fault energies in fcc Fe
چکیده انگلیسی


• DFT calculations.
• Distribution of carbon, manganese and aluminum impurities in austenite.
• Calculated stacking fault energies using VASP.
• Effect of impurities on stacking fault energies.
• Effect of Mn–C clusters and Al-short range ordering on stacking fault energies.

Using ab initio simulation of manganese, aluminum and carbon impurities in fcc Fe, we demonstrated the features in their distribution, which involves repulsion of interstitial carbon atoms, formation of Mn–C pairs as well as short range Al-ordering of the D03-type. We modeled the formation of stacking faults (SF) and analyzed the impurity effect on the intrinsic stacking fault energy (SFE), which controls the plasticity mechanism in austenitic alloys. First, we found that impurities have an influence on the SFE only when they are located within a few atomic layers near a stacking fault. As a result, the SFE is highly sensitive to the concentration of impurities in the vicinity of stacking fault defect. Aluminum and carbon as well as manganese for concentrations higher than 15 at.% increase the SFE, while the formation of Mn–C pairs and Al-ordering restrain the SFE growth. Short range Al-ordering strongly decreases the unstable stacking fault energy (USFE) making the formation of the stacking fault much easier, but does not affect the SFE that can explain the observed planar glide deformation before the occurrence of mechanical twinning regardless of the SFE.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 582, 5 January 2014, Pages 475–482
نویسندگان
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