کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7882303 | 1509607 | 2014 | 19 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the nature of γⲠphase cutting and its effect on high temperature and low stress creep anisotropy of Ni-base single crystal superalloys
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: On the nature of γⲠphase cutting and its effect on high temperature and low stress creep anisotropy of Ni-base single crystal superalloys On the nature of γⲠphase cutting and its effect on high temperature and low stress creep anisotropy of Ni-base single crystal superalloys](/preview/png/7882303.png)
چکیده انگلیسی
The creep anisotropy of the single crystal superalloy LEK 94 deformed in tension along [0 0 1] and [1 1 0] directions at 1293 K and 160 MPa was investigated. Elementary microstructural processes which are responsible for a higher increase in creep rates with strain during [1 1 0] as compared to [0 0 1] tensile loading were identified. [1 1 0] tensile creep is associated with a higher number of γⲠphase cutting events, where two dislocations with equal Burgers vectors of type ã1 1 0ã jointly shear the γⲠphase. The resulting ã2 2 0ã-type superdislocation can move by glide. In contrast, during [0 0 1] tensile loading, two dislocations with different ã1 1 0ã-type Burgers vectors must combine for γⲠphase cutting. The resulting ã2 0 0ã-type superdislocations can only move by a combination of glide and climb. The evolution of dislocation networks during creep determines the nature of the γⲠphase cutting events. The higher [1 1 0] creep rates at strains exceeding 2% result from a combination of a higher number of cutting events (density of mobile dislocations in γâ²) and a higher superdislocation mobility (ã2 2 0ã glide) in the γⲠphase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 69, May 2014, Pages 246-264
Journal: Acta Materialia - Volume 69, May 2014, Pages 246-264
نویسندگان
L. Agudo Jácome, P. Nörtershäuser, C. Somsen, A. Dlouhý, G. Eggeler,