کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5016720 | 1465583 | 2017 | 32 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Quasi-periodic variation of Peierls stress of dislocations in face-centered-cubic metals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Quasi-periodic variation of Peierls stress of dislocations in face-centered-cubic metals Quasi-periodic variation of Peierls stress of dislocations in face-centered-cubic metals](/preview/png/5016720.png)
چکیده انگلیسی
The Escaig stress, i.e. the shear stress perpendicular to the Burgers vector, modulates the stacking fault area between two partials of a full dislocation, in turn, affects the mobility of the dislocation. In this paper, using the newly improved semi-discrete variational Peierls-Nabarro (SVPN) model we studied the variation of Peierls stress (Ïp) of dislocations in face-centered-cubic crystals with respect to the Escaig stress. We found that Ïp quasi-periodically oscillates and the oscillation gradually decreases with the increase of Escaig stress. This quasi-periodic variation of Ïp can be mathematically described by the combination of a sinusoidal and an exponential function, and further accounted for by the variation of the stacking fault width (SFW) between two partials during their movement under applied stress. For the maximum Ïp, SFW is about integral multiples of the Peierls period. For the minimum Ïp, SFW is around half-integral multiples of Peierls period. The variation of Ïp is associated with the oscillation magnitude of SFW from half-integral multiples to integral multiples of the Peierls period and then back to integral multiples of Peierls period caused by the Escaig stress. Molecular dynamics (MD) simulations further examined quasi-periodic variation of Ïp, validating the SVPN model's capability of predicting sophisticated behavior of dislocation under applied stress.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Plasticity - Volume 90, March 2017, Pages 156-166
Journal: International Journal of Plasticity - Volume 90, March 2017, Pages 156-166
نویسندگان
Guisen Liu, Xi Cheng, Jian Wang, Kaiguo Chen, Yao Shen,