کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5454736 | 1514359 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure characterization and mechanical properties of TiAl-based alloys prepared by mechanical milling and spark plasma sintering
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Microstructure characterization and mechanical properties of TiAl-based alloys prepared by mechanical milling and spark plasma sintering Microstructure characterization and mechanical properties of TiAl-based alloys prepared by mechanical milling and spark plasma sintering](/preview/png/5454736.png)
چکیده انگلیسی
High Nb containing TiAl alloy powders with or without mechanical milling were consolidated by spark plasma sintering (SPS) technique. The effects of SPS temperature and mechanical-milling treatment on phase constitution and microstructure were studied, and the mechanical properties at room temperature were tested. The phases in the as-atomized powder are composed of major α2 phases, a few γ phases and a trace of β phases. After milling, the diffraction peaks for α2 phase are obviously broadened, and the intensities of diffraction peaks for both γ phase and β phase are decreased. Similar phase constitution including a large quantity of γ phases and a few α2 phases are exhibited in the alloys sintered by either as-atomized powder or as-milled powder. At a sintering temperature of 1200 °C, the microstructure of the alloy sintered by using as-atomized powder consists of inhomogeneous γ and α2 phases as well as a few α2/γ lamellar colonies. By contrast, the densities increase and the microstructures are apparently refined for the alloys sintered by using as-milled powder. Fully dense alloys with uniformly distributed γ and α2 grains can be obtained at extending milling time or increasing rotating speed. The nucleation of γ phase during SPS of the powders is dependent on recrystallization. The heterogeneity of deformation should be responsible for the formation of heterogeneous γ grains in the alloys sintered by using as-atomized powder. The heterogeneous grain size for the alloys sintered by using as-milled powders is mainly derived from the inhomogeneous nucleation of γ phase and the uneven distribution of α2 grains. Good mechanical property accompanied by a fine grain size and a dense microstructure can be achieved by optimizing the process parameters.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Characterization - Volume 128, June 2017, Pages 75-84
Journal: Materials Characterization - Volume 128, June 2017, Pages 75-84
نویسندگان
Yan Wang, Chi Zhang, Yong Liu, Shouxin Zhao, Jianbo Li,