Abstract
Cube-shaped precipitates in the peak-aged Al–4.0Mg–1.5Cu–0.25Ge (wt.%) alloy were found to exhibit a pseudo five-fold symmetry in their electron diffraction patterns along the ⟨1 1 0⟩ and ⟨1 1 3⟩ zone axes of the Al matrix. These strengthening precipitates, designated as the Z′, possess a structure in a transition state from an icosahedral quasicrystal phase to a face-centred cubic (FCC) quasicrystal approximant phase. After prolonged ageing, the Z′ phase transforms into the FCC equilibrium Z phase having atoms in a periodic icosahedral arrangement.
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