Publication | Closed Access
Formation of quasicrystals in bulk glass forming Zr–Cu–Ni–Al alloys
372
Citations
0
References
1996
Year
Materials EngineeringMaterials ScienceEngineeringGlass-forming LiquidGlass TransitionGlass Transition TemperatureApplied PhysicsGlass Transition TemperaturesGlass MaterialBulk GlassAmorphous MetalCrystallographyBest GlassMicrostructureAmorphous Materials
Zr65Cu17.5Ni10Al7.5 as well as Zr69.5Cu12Ni11Al7.5 belong to the best glass forming alloys known. Glass transition temperatures of melt-spun ribbons are 372 and 360 °C, respectively. TEM and x-ray analysis of samples annealed above the glass transition temperature exhibit the formation of quasicrystalline microstructures with small amounts of crystalline phases. The metastable icosahedral phase is primitive with a quasilattice constant a=0.253 nm; its composition as determined by EDX is close to Zr69.5Cu12Ni11Al7.5. In both glasses, growth of the quasicrystals has been observed to be time-dependent (r∝t1/2), thus indicating a diffusion controlled transformation.