کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6464607 1362207 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Amorphization and nanocrystalline Nb3Al intermetallic formation during mechanical alloying and subsequent annealing
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Amorphization and nanocrystalline Nb3Al intermetallic formation during mechanical alloying and subsequent annealing
چکیده انگلیسی


- Formation of amorphous structure at a low temperature.
- Nb3Al intermetallic compound with nanocrystalline structure.
- Intermetallic phases formation during mechanical alloying and heat treatment.

In this paper the formation as well as the stability of Nb3Al intermetallic compounds from pure Nb and Al metallic powders through mechanical alloying (MA) and subsequent annealing were studied. According to this method, the mixture of powders with the proportion of Nb-25 at% Al were milled under an argon gas atmosphere in a high-energy planetary ball mill, at 7, 14, 27 and 41 h, to fabricate disordered nanocrystalline Nb3Al. The solid solution phase transitions of MA powders before and after annealing were characterized using X-ray diffractometry (XRD). The microstructural analysis was performed using scanning electron microscopy (SEM) as well as transmission electron microscopy (TEM). The results show that in the early stages of milling, Nb(Al) solid solution was formed with a nanocrystalline structure that is transformed into the amorphous structure by further milling times. Amorphization would appear if the milling time was as long as 27 h. Partially ordered Nb3Al intermetallic could be synthesized by annealing treatment at 850 °C for 7 h at lower milling times. The size of the crystallites after subsequent annealing was kept around 45 nm.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advanced Powder Technology - Volume 28, Issue 2, February 2017, Pages 340-345
نویسندگان
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