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Strengthening of nanocrystalline Al using grain boundary solute additions: Effects of thermal annealing and ion irradiation
Strengthening of nanocrystalline Al by grain boundary solute additions was investigated for a series of dilute aluminum alloys, Al-Sc, Al-Sb, Al-Cr, and Al-W with grain sizes in the range of 50–200 nm. Thermal annealing of the alloys at low temperatures led to alloy softening, but with negligible change in the grain size. The re- duction in strength can be attributed to the loss of solute in the grain boundaries arising from grain boundary diffusion and precipitation. Annealing at higher temperatures led to grain growth, but with little additional loss of strength, a result of precipitation hardening. The Al-Sc and Al-Sb alloys were additionally subjected to ion irradiation at various temperatures. Furthermore, these studies revealed that annealed samples regained their hardness due to solute redistribution by ion beam mixing. Alloy strength was independent of grain size between 50 and 150 nms. Irradiation-induced segregation of Sb to grain boundaries in Al-Sb further enhanced strengthening.
Materials Data on AlSb by Materials Project
AlSb is Wurtzite structured and crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. Al3+ is bonded to four equivalent Sb3- atoms to form corner-sharing AlSb4 tetrahedra. There are three shorter (2.70 Å) and one longer (2.71 Å) Al–Sb bond lengths. Sb3- is bonded to four equivalent Al3+ atoms to form corner-sharing SbAl4 tetrahedra.
Materials Data on AlSb by Materials Project
AlSb is BCT5-derived structured and crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. Al3+ is bonded to five equivalent Sb3- atoms to form a mixture of edge and corner-sharing AlSb5 trigonal bipyramids. There are a spread of Al–Sb bond distances ranging from 2.79–2.88 Å. Sb3- is bonded to five equivalent Al3+ atoms to form a mixture of distorted edge and corner-sharing SbAl5 trigonal bipyramids.