کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5458245 | 1516165 | 2017 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal stability of γⲠphase in long-term aged Co-Al-W alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Three cast alloys with compositions of Co-9Al-8W-0.1B, Co-9Al-9W-0.1B and Co-9Al-11W-0.1B (all atomic percent) were aged at 900 °C for 200 h, 500 h, 1000 h, 2000 h, 5000 h and 10000 h to investigate the thermal stability of L12 type γâ²-Co3(Al,W) precipitates. The microstructure during the extended ageing process was observed by Scanning and Transmission Electron Microscopy in order to investigate the evolution of the γ/γⲠtwo-phase microstructure and the formation of any additional phases. It was found after 5000 h ageing that four phases, γ, γâ², D019 and B2, were present within the microstructure as identified by X-ray Diffraction combined with Transmission Electron Microscopy and Electron Backscattered Diffraction. The γⲠprecipitates coarsened according to modified Lifshitz, Slyozov and Wagner theory generally. The fraction of γⲠphase decreased while that of D019 phase increased contrarily. The phase transformation process from γâ²-L12 to D019 was illustrated by Transmission Electron Microscopy. Stacking faults were identified as the initial step of the decomposition of the γⲠphase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 729, 30 December 2017, Pages 266-276
Journal: Journal of Alloys and Compounds - Volume 729, 30 December 2017, Pages 266-276
نویسندگان
Yuzhi Li, Florian Pyczak, Michael Oehring, Li Wang, Jonathan Paul, Uwe Lorenz, Zekun Yao,