The structure and the properties of S-phase in AlCuMg alloys

Formation mechanism of precipitate T1 in AlCuLi alloys

“…The latter is equipped with aberration-correctors for the probe-forming lens, and operated at 200kV with convergence semi-angle of 21.4 mrad and HAADF collection semi-angles of 53 to 200 mrad. In STEM mode, the HAADF detector [21], which collects the high-angle elastic scattering electrons, provides a Z contrast proportional to Z 1.7-2.0 [22,23]. In here, the Cu atoms exhibit the brightest contrast, whereas, the Li atoms show the weakest contrast.…”

“…For all structures, k-points sampling using Monkhorst-Pack method [27] was increased to reach the precision of 0.1kJ/mol. The thermal contributions and zero-vibration energy differences or contributions were ignored because of their little effects on the Al alloy system [23].…”

The possibilities to lower the stacking fault energies of aluminum materials investigated by first-principles energy calculations

“…The properties of Al materials depend strongly on their microstructures such as precipitates of alloying elements [4][5][6][7], grain size and texture, and as well their crystal defects such as dislocations, stacking faults (SFs), solutes of alloying elements, vacancies and interstitials [8][9][10]. With the rapid development of the cosmic space and nuclear industries, many devices made of aluminum alloys may serve under the condition of irradiation damage.…”

A hybrid aluminium alloy and its zoo of interacting nano-precipitates

“…S-Al2CuMg [33,34,35] is found less frequently than L. GPB units, which usually play the role of nucleating the S phase [11], are commonly observed on the S-Al interfaces. The same are Si-containing disordered regions typical of L phases, marked with rounded rectangles on Fig. …”