Effect of Processing Parameters on the Microstructure of Mechanically Alloyed Nanostructured Al‐Mn Alloys

Power law scaled hardness of Mn strengthened nanocrystalline Al Mn non-equilibrium solid solutions

“…In the present work, the influence of Mn on the Al-Mn solid solution lattice parameter, φ, Δρ , and hardness are investigated via first-principles calculations based on density functional theory (DFT) [40]. Darling et al [10,21]; there is also good match to the experimentally measured lattice parameters in dash lines, reported by Jones (which includes the results of Bletry, Babic, and…”

“…The experimentally obtained lattice parameters,shown by dashed lines(Bletry, Babic et al, and Stump and Jansen) are reported in Jones[44] and Ruan and Schuh[9]. The navy solid line is based on the experimental data points (solidopen symbols) measured by Darling et al[10,21]. The solid symbols are obtained from firstprinciples calculations.…”

“…Moreover, the most recent measurements by Darling et al[10,21] show that the hardness of the nanocrystalline Al-Mn solid solutions improves linearly with increasing Mn concentration. Moreover, Ruan and Schuh[9] report that the hardness of macrocrystalline Al-Mn solid solutions increases from 1 GPa to 2.8 GPa with adding Mn from 0 at.% to 7.5 at.%, which also have a significant decrease in grain size.…”

“…GPa have been reported [9][10][11]21] along with enhanced bending ductility [11] and toughness [9,10,13,22]. However, despite reporting these remarkable properties, very little has been done to separate and quantify the contributions from the various strengthening mechanisms in these alloys, such as grain size refinement, particle strengthening, and the formation of nonequlibrium solid solutions.…”

“…are reasonable and can be attributed to the thermal expansion of the solid solution. The firstprinciples calculations using PAW-GGA-PBEsol result in a smaller lattice parameter (-3.2%) and equilibrium volume (-2.3%) than those obtained via PAW-GGA (as shown in Table S1 To correlate the lattice parameter and hardness of the Al-Mn solid solutions [10,21,44], the effects of Mn on the EWF are studied through comparing two different pseudopotentials. The predicted EWF values together with the key parameters in the Halas-Durakiewicz model [25,42,43] for Al, Mn, and the Al-Mn solid solutions are summarized in Table S1 of the supplementary information, which are also compared with available experimental and theoretical data in the literature.…”