Figure 5
Formation of amorphous and nanocrystalline phases on the as-sputtered and annealed libraries. (a) Isothermal cut from the Al-Cu-Fe system at 700 °C, redrawn from reference40 (Republished with permission of Royal Society of Chemistry; permission conveyed through Copyright Clearance Center, Inc.). In this figure, the quasicrystalline phase (i-QC) is shown along with the phases that form two-phase fields with it. Those phases are φ-Al10Cu10Fe, ω-Al7Cu2Fe, β-AlFe(Cu) and λ-Al13Fe4. The two-phase fields are delineated by blue lines connecting them to i-QC. Compositions which exhibited amorphous XRD patterns in the as-sputtered libraries are represented as a blue-shaded area. (b,c) Compositions with nanocrystalline grain structure after annealing at 400 °C and 520 °C, respectively. These are the compositions between i-QC and λ-Al13Fe4, of which both are phases with a high degree of polytetrahedral atomic structure.
