Structural features in icosahedral Al{sub 63}Cu{sub 25}Fe{sub 12}

Conference · Tue Aug 20 00:00:00 EDT 1991

OSTI ID:10118909

Howell, R H; Solal, F; Turchi, P E.A. ^[1]; Berger, C ^[2]; Calvayrac, Y ^[3]

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1. Lawrence Livermore National Lab., CA (United States)
2. Centre National de la Recherche Scientifique (CNRS), 38 -Grenoble (France)
3. Centre National de la Recherche Scientifique (CNRS), 94 - Vitry-sur-Seine (France). Centre d`Etudes de Chimie Metallurgique

Since the discovery of a quasicrystalline phase in Al-Mn alloys a substantial amount of work has been done to understand the structural and physical properties of this new class of materials. More recently the discovery of a thermodynamically stable icosahedral phase in AlCuFe presents the opportunity to study pure quasicrystalline phases of high structural quality by eliminating known defects, especially phason disorder by conventional heat treatment. In particular it was shown that annealing treatments of as quenched samples resulted in a dramatic reduction in the width of the diffraction peaks associated with the elimination of as quenched defects, present in other quasicrystals. Positron annihilation lifetime measurements have a high sensitivity to intrinsic defects and positron annihilation radiation angular correlation measurements are well suited to measurements of electronic structure in systems where the defect effects do not dominate. We have measured positron annihilation lifetime and angular correlations on quasicrystalline samples of Al{sub 63}Cu{sub 25}Fe{sub 12} in the pure icosahedral phase.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10118909
• Report Number(s): UCRL-JC-105980; CONF-9108150-4; ON: DE92006902
• Resource Relation: Conference: 9. international conference on positron annihilation,Szombathely (Hungary),26-31 Aug 1991; Other Information: PBD: 20 Aug 1991
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
CRYSTAL DEFECTS
ANNEALING
COPPER ALLOYS
IRON ALLOYS
TEMPERATURE DEPENDENCE
POSITRONS
ANNIHILATION
ELECTRONIC STRUCTURE
360102
360101
360104
STRUCTURE AND PHASE STUDIES
PREPARATION AND FABRICATION
PHYSICAL PROPERTIES