On The Mechanical Milling of AlCuCo Quasicrystalline Phase

Abstract

In the present work, the Al₆₅Cu₁₅Co₂₀ alloy composition was processed by high-energy ball milled to systematically evaluate the phase transitions of the quasicrystalline prealloyed ingot. The quasicrystalline alloy was previously fabricated by conventional casting techniques. Subsequently, this alloy was milled for different times using an SPEX mixer mill. The microstructures were examined by high-resolution electron microscopy and the structural changes were also analyzed by Xray diffraction patterns. The results indicate that the quasicrystalline alloy is stable after 5 h of milling, containing nanoquasicrystalline domains. However, the sample milled by 10 h shows a quasicrystal-to-amorphous phase transition. Subsequently, after 20 h of milling, the amorphous phase re-crystallizes to the B2 structure type.