Mechanical Properties of Al–Cu–Fe Alloys Sintered at High Pressure

Abstract

The structure and mechanical behavior at room temperature of bulk sintered materials with high hydrostatic pressure are studied. Quasicrystalline Al₆₃Cu₂₅Fe₁₂ and Al_62.7Cu₂₅Fe₁₂Sc_0.3 powders and Al₆₆Cu₁₈Fe₈Cr₈, powder, which is the quasicrystal approximant, are sintered at high pressure. The powders are obtained by water atomization technique. At an optimal hot compaction pressure of 4.5 GPa, the porosity of the materials is lower than 2%. Sintering is conducted at 700°С. The strain curves of quasicrystals and their approximants that are brittle at standard test conditions are obtained by indentation technique. It is shown that the crystalline approximants of quasicrystals are much closer in their mechanical behavior to quasicrystals than to crystalline solids.