2015年4月1日 · The TEM studies were carried out using a Philips CM 30™ instrument operating at an accelerating voltage of 300 kV. At longer milling times (90 h), bright-field (BF) images were used to observe the crystallites, and selected area electron diffraction (SAED) was employed to identify the crystallography and the nature of the phases.

摘要 通过透射电子显微镜(TEM) 研究了形成在Cu (001) 和(111) 表面上的θ (θ)-Al2Cu/Cu 和γ2 (γ2)-Al4Cu9/Cu 界面的取向关系和界面平面。 在单晶 NaCl 表面上生长外延薄 Cu 膜，然后蒸发 Al 形成 θ-Al2Cu 和 γ2-Al4Cu9。

2021年1月1日 · TEM DFI and high-resolution lattice images showed that the grain size of θ-Al 2 Cu and γ 2-Al 4 Cu 9 could be as small as ~5 nm. These orientation relationships having a low misfit between IMC and Cu at the interface may reduce …

2021年9月5日 · In the thermodynamic description of the Al-Cu series by Kaufman et al. [4], four intermediate phases were considered, θ (Al 2 Cu), η2 (AlCu), γ1 (Al 4 Cu 9), and β (BCC), of which β phase is only above 873 K appear. Then Chen et al. [5] introduced two other random phases, δ and α2 phases, into the thermodynamic model.

The deformation microstructure of polycrystalline samples upon a tension test was investigated by Transmission Electron Microscopy (TEM). Corresponding straining mechanisms were also identified...

2024年9月4日 · The results show that the submicron intermetallic compounds Al2Cu and Al4Cu9 are formed from the casting-rolling Cu/Al composites. After 15% tensile deformation, many gaps occurred in the interface layer, but at the gaps, there was …

The γ2-Al4Cu9 phase has good orientation relationships to Cu and therefore low interfacial energies. In addition, the energy of formation of γ2-Al4Cu9 is about 1.2 times than that of eta (η)-AlCu. Therefore γ2-Al4Cu9 nucleates first after θ-Al2Cu.

使用第一性原理方法研究了AlCu、Al 2 Cu 和Al 4 Cu 9 在压力下的结构、弹性和热力学性质。 体积比 ( V / V 0 )和平衡晶格常数 ( a / a 0 、 b / b 0 和 c / c 0 )随着压力的增加而减小。 Al 4 Cu 9 在结构稳定性方面优于 AlCu 和 Al 2 Cu，因为它具有最低的内聚能 (Δ E）。 弹性常数 ( C ij ) 表明 AlCu、Al 2 Cu 和 Al 4 Cu 9 在 0-20 GPa 的压力下是机械稳定的。 增加压力增强了抗变形能力。 杨氏模量 ( E )的结果表明AlCu和Al 4 Cu 9 比Al 2 Cu更硬。

Cross-sectional lamellas were prepared from each layer by the focused ion beam (FIB) technique, and then investigated by transmission electron microscopy (TEM) techniques, including: bright field, dark field and HRTEM imaging, selected area electron diffraction (SAED), TEM energy dispersive spectroscopy (EDS), scanning TEM (STEM).

2025年2月1日 · In this letter, multiscale analysis of shock Hugoniot of Al-Cu composites using prediction models, muliti-stage light gas gun, and first-principles (FP) simulations was employed to investigate the effect of Al 4 Cu 9 IMCs on the shock Hugoniot.