On the stable Mg-Zn-Y quasicrystals

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · Metallurgical Transactions, A

DOI:https://doi.org/10.1007/BF02651927· OSTI ID:282228

Luo, Z P ^[1]; Sui, H X ^[2]; Zhang, S Q ^[1]

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1. Beijing Inst. of Aeronautical Materials (China)
2. Beijing Lab. of Electron Microscopy (China)

By the conventional air-cooled casting method, bulk ingots with a large fraction of stable Mg-Zn-Y icosahedral quasicrystals, both simple and face-centered, were obtained. The quasicrystal structures were directly confirmed by high-resolution electron microscopy (HREM) observations. The electron diffraction patterns from the quasicrystals were studied by computer simulations. A coexisting crystalline phase of the quasicrystals was identified as the Mg{sub 7}Zn{sub 3} phase, which was proved to be the (1/1) approximant of the quasicrystals. The quasicrystals were stable during a continuous heating process. However, at high temperature, oxidation occurred, and thus, Y{sub 2}O{sub 3} and MgO products were formed. Oxidation at high temperatures is characteristic for the Mg-Zn-Y alloys and differs from Al-base alloys.

• Sponsoring Organization: USDOE
• OSTI ID: 282228
• Journal Information: Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 7 Vol. 27; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
COMPUTERIZED SIMULATION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
ELECTRON DIFFRACTION
INTERMETALLIC COMPOUNDS
MAGNESIUM BASE ALLOYS
MELTING
POWDERS
TRANSMISSION ELECTRON MICROSCOPY
YTTRIUM ALLOYS
ZINC ALLOYS