کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5455384 | 1514638 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of nano-twinning on the deformation and mechanical behaviours of TiAl alloys with distinct microstructure at elevated loading temperatures
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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: Effects of nano-twinning on the deformation and mechanical behaviours of TiAl alloys with distinct microstructure at elevated loading temperatures Effects of nano-twinning on the deformation and mechanical behaviours of TiAl alloys with distinct microstructure at elevated loading temperatures](/preview/png/5455384.png)
چکیده انگلیسی
To study the influence of the microstructure on both the deformation mechanisms and mechanical properties of TiAl alloys at elevated temperatures, Ti-44Al (at%) alloy with a fully lamellar microstructure and Ti-47Al (at%) alloy with a duplex microstructure were prepared by adjusting the Al content. Hot compression tests at temperatures ranging from 600 â to 1000 â were performed on both the Ti-44Al and the Ti-47Al alloys. The analysis of the deformation mechanism reveals that nano-twinning is the dominant deformation mechanism of the γ phase. Nanoscale twins in a single γ phase traverse the whole γ phase grain, rather than becoming inhibited by the lamellar interfaces in the γ/α2 lamellar colonies. Thus, the length of nano-twins in a single γ phase is much longer than that in a γ phase lamella within γ/α2 lamellar colonies, resulting in a lower yield strength but better ductility. By increasing the loading temperature, the ductility of the γ/α2 lamellar colonies is markedly improved due to dynamic recrystallization (DRX), while the ductility of the single γ phase is improved by dislocations that traverse the twin boundaries at higher loading temperatures. Moreover, the effects of nano-twinning on the deformation and mechanical behaviours of TiAl alloys, especially at elevated loading temperatures, are discussed in detail.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 705, 29 September 2017, Pages 210-218
Journal: Materials Science and Engineering: A - Volume 705, 29 September 2017, Pages 210-218
نویسندگان
Yanjun Hao, Jinxu Liu, Shukui Li, Jianchong Li, Xuzhen Liu, Xinya Feng,