Đăng nhập
 
Tìm kiếm nâng cao
 
Tên bài báo
Tác giả
Năm xuất bản
Tóm tắt
Lĩnh vực
Phân loại
Số tạp chí
 

Bản tin định kỳ
Báo cáo thường niên
Tạp chí khoa học ĐHCT
Tạp chí tiếng anh ĐHCT
Tạp chí trong nước
Tạp chí quốc tế
Kỷ yếu HN trong nước
Kỷ yếu HN quốc tế
Book chapter
Tạp chí quốc tế 2020
Số tạp chí 201(2020) Trang: 412-424
Tạp chí: Acta Materialia

We examined fatigue-crack-growth behaviors of CoCrFeMnNi high-entropy alloys (HEAs) under as-fatigued and tensile-overloaded conditions using neutron-diffraction measurements coupled with diffraction peak-profile analyses. We applied both high-resolution transmission electron microscopy (HRTEM) and neutron-diffraction strain mapping for the complementary microstructure examinations. Immediately after a single tensile overload, the crack-growth-retardation period was obtained by enhancing the fatigue resistance, as compared to the as-fatigued condition. The combined mechanisms of the overload-induced larger plastic deformation, the enlarged compressive residual stresses and plastic-zone size, the crack-tip blunting ahead of the crack tip, and deformation twinning governed the pronounced macroscopic crack-growth-retardation behavior following the tensile overload. A remarkable fracture surface of highly-periodic serrated features along the crack-propagation direction was found in the crack-growth region immediately after the tensile overload. Moreover, a transition of plastic deformation from planar dislocation slip-dominated to twinning-dominated microstructures in the extended plastic zone was clearly observed at room temperature in the overloaded condition, in accordance with the simulated results by a finite element method (FEM). The above tensile overload-induced simultaneously combined effects in the coarse-grained CoCrFeMnNi shed light on the improvement of fatigue resistance for HEAs applications.

Các bài báo khác
Số tạp chí 0(2020) Trang: 1-17
Tạp chí: Annals of Operations Research
Số tạp chí 10(2020) Trang: 464-466
Tạp chí: International Journal of Scientific and Research Publications
Số tạp chí 8(2020) Trang: 29
Tạp chí: Economies
Số tạp chí 19(2020) Trang: 1-19
Tạp chí: International Journal for Equity in Health
Số tạp chí 225(2020) Trang: 1-17
Tạp chí: Chemical Engineering Science
Số tạp chí 8(2020) Trang: 1006-1016
Tạp chí: Global Scientific Journal
Số tạp chí 3(2020) Trang: 83-90
Tạp chí: International Journal of Science and Management Studies
Số tạp chí 56(2020) Trang: https://doi.org/10.1051/limn/2020012
Tạp chí: Annales Limnologie - Interntaional Limmnology


Vietnamese | English






 
 
Vui lòng chờ...