کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7969092 | 1514346 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dispersoids and γⲠprecipitates in an ultrafine grained René 88DT - 5vol.%Y2O3 alloy with outstanding thermal stability
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We report on an ultrafine-grained (UFG) René 88DT-5vol.%Y2O3 alloy with a high thermal stability fabricated through high energy mechanical milling and thermomechanical powder consolidation. The as-extruded sample consists of an ultrafine grained γ matrix with an average size of 122â¯nm with Y4Al2O9 nanoparticles (average size: 12.6â¯nm) and TiN particles (size about 150â¯nm) being dispersed in the matrix. The UFG microstructure of the alloy showed an outstanding thermal stability with the average grain size only increasing slightly from 122 to 145â¯nm after holding at 1120â¯Â°C (0.85Tm, where Tm is the solidus temperature of the alloy in Kelvin scale) for 2â¯h and subsequently holding at 760â¯Â°C for 16â¯h. Due to the consumption of γⲠforming elements, Ti and Al, by the formation of the Y4Al2O9 and TiN dispersoids, the content of γⲠprecipitates in the microstructure of the heat treated sample is significantly reduced, as confirmed by experimentation and calculation using the JMatPro software. Additionally, the size of γⲠprecipitates also sharply decreased to 20-30â¯nm in the heat treated UFG René 88DT-5vol.%Y2O3 alloy, in contrast to a size of 100-150â¯nm in the Y2O3-free base alloy under the same heat treatment condition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 141, July 2018, Pages 139-147
Journal: Materials Characterization - Volume 141, July 2018, Pages 139-147
نویسندگان
Tian Xia, Chao Yang, Wei Zeng, Yuehuang Xie, Yiwen Zhang, Deliang Zhang, Guoliang Zhu, Da Shu, Enrique J. Lavernia,