کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7970528 | 1514387 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructural characterization of a new mechanically alloyed Ni-base ODS superalloy powder
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The microstructure of a new Ni-base oxide dispersion strengthened superalloy powder was studied for high temperature gas turbine applications after the mechanical alloying process. In this study, an atomized powder with a composition similar to the CMSX-10 superalloy was mechanically alloyed with yttria and Hf powders. The mechanically alloyed powder included only the supersaturated solid solution γ phase without γⲠand yttria provided by severe plastic deformation, while after the 3-step aging, the γⲠphase was precipitated due to the partitioning of Al and Ta to the γⲠand Co, Cr, Re, W, and Mo to the γ phase. Mechanical alloying modified the morphology of γⲠto the new coherent γ-γⲠnanoscale lamellar structure to minimize the elastic strain energy of the precipitation, which yielded a low lattice misfit of 0.16% at high temperature. The γⲠlamellae aligned preferentially along the elastically soft [100] direction. Also, the precipitated oxide particles were refined in the γ phase by adding Hf from large incoherent YAlO3 to fine semi-coherent Y2Hf2O7 oxide particles with the average size of 7 nm and low interparticle spacing of 76 nm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 100, February 2015, Pages 135-142
Journal: Materials Characterization - Volume 100, February 2015, Pages 135-142
نویسندگان
S.M. Seyyed Aghamiri, H.R. Shahverdi, S. Ukai, N. Oono, K. Taya, S. Miura, S. Hayashi, T. Okuda,