کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1601623 | 1005206 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reactive processing of nanostructured nickel aluminide intermetallics starting from elemental nanopowders
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The current paper investigates the fabrication of nanostructured intermetallic alloys Ni3Al starting from elemental nanopowders Ni and Al micro-alloyed with different compositions of submicron B and Nb metal powders. Low-energy reaction synthesis (RS) of the nanopowder green's compact in an air furnace was successfully carried out from which a nanostructured micro-alloyed Ni3Al alloy was successfully produced. The nanopowders were completely reacted to form the intended single-phase nanostructured Ni3Al with no remaining nanopowders up to 0.3 and 4Â wt% compositions of B and Nb, respectively, with a maximum relative density of 90%. Microstructure examination revealed that the micro-alloyed Ni3Al alloys produced contain very fine grain structures (120-140Â nm) which resulted in an almost 200% increase in the microhardness, as well as a considerable increase in the final product ductility as a result of small micro-alloying additions of B (0.1Â wt%) and Nb (up to 4Â wt%). Both SEM/EDS analysis and XRD were used to examine the phase compositions after the in situ reactive processing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 15, Issue 8, August 2007, Pages 1057-1065
Journal: Intermetallics - Volume 15, Issue 8, August 2007, Pages 1057-1065
نویسندگان
S.O. Moussa, A. Sherif El-Gizawy, M. Samy El-Shall,