کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5460095 | 1516170 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Shearing mechanisms of stacking fault and anti-phase-boundary forming dislocation pairs in the γⲠphase in Ni-based single crystal superalloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Shearing mechanisms of stacking fault and anti-phase-boundary forming dislocation pairs in the γⲠphase in Ni-based single crystal superalloy Shearing mechanisms of stacking fault and anti-phase-boundary forming dislocation pairs in the γⲠphase in Ni-based single crystal superalloy](/preview/png/5460095.png)
چکیده انگلیسی
Ni-based superalloys rely on high volume fractions of L12 ordered γⲠphase precipitates for strength against creep deformation at elevated temperatures. However, under certain conditions dislocations existing in the FCC γ matrix may enter the L12 γⲠphase in pairs. The shear motion of different combinations of dislocation pairs creates different planar defects in the γⲠphase, including anti-phase boundaries (APB) or stacking faults. The formation of an APB requires the shear distortion associated with an a/2ã110ã dislocation and the formation of a stacking fault requires the shear distortion associated with a kã112ã dislocation. Given that the native dislocations in FCC structure are a/2ã110ã, the formation mechanism of kã112ã dislocations remains to be clarified. Different mechanisms have been suggested for the formation of stacking faults in the γⲠphase in the literature. In this study, the shearing motions of various partial dislocation pairs and the planar defects formed in the γⲠphase were investigated by means of transmission electron microscopy and the mechanisms were analyzed in terms of their crystallographic and energetic implications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 724, 15 November 2017, Pages 287-295
Journal: Journal of Alloys and Compounds - Volume 724, 15 November 2017, Pages 287-295
نویسندگان
Haibo Long, Yinong Liu, Deli Kong, Hua Wei, Yanhui Chen, Shengcheng Mao,