Crystal–quasicrystal transition depending on cooling rates in directionally solidified Al–3Mn–7Be (at.%) alloy

Formation of Quasicrystalline Phases and Their Close Approximants in Cast Al-Mn Base Alloys Modified by Transition Metals

“…For many years it was believed that a fine two-phase microstructure composed of I-phase and Al can be formed only by rapid solidification techniques. However, it has been shown that Be addition strongly enhances I-phase nucleation in the Al-Mn alloys providing quasicrystals containing microstructures at considerable lower cooling rates [16][17][18][19][20]. Be addition is also known for being carcinogenic and causing other serious diseases, such as berylliosis [21], thus, other elements that could enhance the I-phase formation during conventional casting processes are desirable.…”

Controllable 3D morphology and growth mechanism of quasicrystalline phase in directionally solidified Al–Mn–Be alloy

“…3(d)], indicating a simple icosahedral phase. 1 The average composition of the primary I-phase particles is measured about Al 55 Be 30 Mn 15 by Auger electron spectroscopy and energy dispersive spectrometry in our previous work, 32 and the corresponding valence electrons per atom ratio (e/a) for this composition is 1.70. Thus, this phase clearly belongs to the Frank-Kasper type.…”

Dynamic Fracture Mechanism of Quasicrystal-Containing Al–Cr–Fe Consolidated Using Spark Plasma Sintering

“…For some stable QCs with a polycrystalline structure, obvious temperature-induced influences on hardness and thermal expansion have been observed [23][24][25]. In addition, studies on the equilibrium phase diagram, the effect of annealing on the quality of the stable icosahedral structure, and the orientation dependence on icosahedral phase growth have been conducted [25][26][27][28]. However, the mechanical properties of QCs at dynamic deformation rates are seldom reported.…”