Al3(Sc,Zr)-based precipitates in Al–Mg alloy: Effect of severe deformation

A Scandium Modified Al-0.7 Fe Binary Alloy: Improvement of Creep- Resistance Property

“…It can be explained by the following schematic of dislocation motion in Figure 8. As it can be seen, a counter flux [27] of Sc solute atoms have opposite direction to vacancies, and the density of dislocations decreased as it can be seen in Figures 3 and 7. These vacancies increase at grain boundary, and a counter Sc flux increases at grain interior, as it is at elevated temperature, still to a equilibrium state.…”

“…In the formation of fine and coherent Al 3 Sc precipitates with the L1 2 structure, which remain high creep-resistance to ~300℃ [25,26], due to a slow-diffusion element of Sc. Yu et al [27] has found that pure Al 3 Sc precipitates and misfit dislocations can be observed only when the size of precipitates is larger than 16 nm. Additionally, the trace diffusivity of Sc in Al-0.7Fe alloy, may further impede the dislocations and grain boundary motions, and provide higher creep-resistance property than Al-0.7Fe alloy, as shown in Table 1.…”

Precipitate-induced nonlinearities of diffusion along grain boundaries in Al-based alloys

“…The deformed microstructures were described in detail in previous publications [4,7,31]. Here we will present the most relevant details and the results for the microstructures relevant for subsequent diffusion measurements.…”

“…[7] for additional alloying components as, e.g., Mn, Ti, Zr) was produced by continuous casting, and ingots were homogenized by annealing at (643 ± 10) K for 12 h. The ingots were then extruded at 653 K imposing about 70% strain. The resulting rods were subjected to eight passes of ECAP processing at a temperature of 573 K with application of about 100 MPa back pressure following the route B C [27].…”

“…A complex Al-based alloy is chosen for the investigation. We chose Mg and Sc as main alloying components, since good experiences with nanoprecipitation have been made [6,7]. The 57 Co isotope is chosen as a convenient tracer element for this system.…”