کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1449175 988693 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transformation of ordered face-centered tetragonal θ-MnNi phase to face-centered cubic austenite during isothermal aging of an Fe–Mn–Ni alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Transformation of ordered face-centered tetragonal θ-MnNi phase to face-centered cubic austenite during isothermal aging of an Fe–Mn–Ni alloy
چکیده انگلیسی

The transformation of the grain boundary fct θ-MnNi precipitates to thermodynamically stable austenite was investigated in an Fe–Mn–Ni alloy using transmission electron microscopy (TEM). During aging of Fe–Mn–Ni alloys, fine bands began to develop in the θ-MnNi intermetallic particles. The HAADF images revealed these thin bands to be stacking faults and twins that were formed by the glide of 16〈112〉-type Shockley partial dislocations on {1 1 1} planes. The presence of iron in the twin bands was detected by electron energy-loss spectroscopy (EELS) analysis. These observations supported the conclusion that the crystal structure of the twin bands was transformed to that of face-centered cubic (fcc) austenite by iron diffusion into the twin bands. A further transformation of the θ-MnNi particle to austenite was proceeded by the development of new austenite bands rather than by the broadening of the existing bands. The mechanism of this transformation was discussed based on the crystal structure of both phases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 56, Issue 6, April 2008, Pages 1306–1314
نویسندگان
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