skip to main content
Ngôn ngữ:
Giới hạn tìm kiếm: Giới hạn tìm kiếm: Dạng tài nguyên Hiển thị kết quả với: Hiển thị kết quả với: Chỉ mục

On the stacking fault energy related deformation mechanism of nanocrystalline Cu and Cu alloys: A first-principles and TEM study

Zhang, Yong ; Guo, Jinming ; Chen, Jianghua ; Wu, Cuilan ; Kormout, Karoline Sophie ; Ghosh, Pradipta ; Zhang, Zaoli

Journal of Alloys and Compounds, 05 March 2019, Vol.776, pp.807-818 [Tạp chí có phản biện]

ISSN: 0925-8388 ; E-ISSN: 1873-4669 ; DOI: 10.1016/j.jallcom.2018.10.275

Toàn văn sẵn có

Trích dẫn Trích dẫn bởi
  • Nhan đề:
    On the stacking fault energy related deformation mechanism of nanocrystalline Cu and Cu alloys: A first-principles and TEM study
  • Tác giả: Zhang, Yong ; Guo, Jinming ; Chen, Jianghua ; Wu, Cuilan ; Kormout, Karoline Sophie ; Ghosh, Pradipta ; Zhang, Zaoli
  • Chủ đề: Nanocrystalline Cu Alloys ; Stacking Fault Energy ; Deformation Mechanism ; First-Principles Calculations ; Hrtem ; Engineering ; Chemistry ; Physics
  • Là 1 phần của: Journal of Alloys and Compounds, 05 March 2019, Vol.776, pp.807-818
  • Mô tả: Bulk nanocrystalline alloys usually possess enhanced properties than their coarse-grained counterparts. Here, first-principles calculations and aberration-corrected transmission electron microscope (TEM) were employed to investigate the atomic-scale deformation mechanism of Cu-based alloys. The effect of alloying element concentration and temperature-induced solute distribution on the unstable stacking fault energy (γ ), stable stacking fault energy (γ ) and unstable twin fault energy (γ ) were calculated using a Fermi–Dirac distribution of solutes for 42 binary Cu-X alloys. At medium temperature (>200 K) or low solute concentrations (<15 at.%), the stacking fault energies calculated from the Fermi–Dirac model accord well with the available experimental and theoretical results. The deformation mechanism was then evaluated by α = γ /γ and β = γ /γ , smaller α (β) favors an easier formability of extended dislocations (twins). Most subgroup VI-VIII metals in the periodic table can slightly increase the γ , γ and γ of Cu, and have almost no influence on α and β. While main group and subgroup II-V elements can decrease γ , γ and γ as well as the values of α and β. For alloying elements of Pd, Ag, Pt and Au, the values of α and β increase, suggesting a tendency of deformation mechanism from extended dislocations to full dislocations. Furthermore, high-resolution TEM (HRTEM) images of four representative nanocrystalline alloys (pure Cu, Cu-Fe, Cu-Ag and Cu-Zn) corroborates the prodiction with α and β as well as the empirical twinnability. The α and β remain almost the same as that of pure Cu when alloyed with Fe while they decrease with Zn, and the extended dislocations and twins were commonly observed for Cu, Cu-Fe and Cu-Zn. The α and β increased with Ag addition although the γ decreased, and the extended dislocations were barely observed for Cu-Ag sample. The theoretical and microstructural correlation provides insights into the deformation mechanism of Cu-based alloys.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0925-8388 ; E-ISSN: 1873-4669 ; DOI: 10.1016/j.jallcom.2018.10.275

Đang tìm Cơ sở dữ liệu bên ngoài...