Compositions of different phases appearing during devitrification of Zr46.75Ti8.25Cu7.5Ni10Be27.5 bulk metallic glass |
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| Authors: | B. Van de Moortèle § T. Epicier J. L. Soubeyroux J. M. Pelletier |
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| Affiliation: | 1. GEMPPM , Unité Mixte de Recherche associée au CNRS 5510, batiment B. Pascal, Institut National des Sciences Appliquées , 69621 Villeurbanne Cedex, France;2. Laboratoire de Cristallographie , CNRS–CRETA , 25 avenue des Martyrs, BP 166, 38042 Grenoble, France |
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| Abstract: | The devitrification process of Zr46.75Ti8.25Cu7.5Ni10Be27.5 metallic glass during annealing in the supercooled liquid region has been studied by conventional, high-resolution and analytical transmission electron microscopy (TEM). Two kinds of particle appear during devitrification: quasicrystals and crystalline precipitates. Nanoanalysis with energy-dispersive X-ray spectroscopy and electron energy-loss spectroscopy reveal that quasicrystals are Be free, while the crystallites have the ZrBe2 hexagonal structure. These experiments confirm the key role of Be during devitrification. They also indicate that quasicrystals can form in the system Zr–Ti–Cu–Ni (without Be), as further evidenced by direct synthesis and an in situ neutron diffraction investigation, according to the chemical composition deduced from the TEM analysis. |
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