Yurechko M. Phase equilibria in ternary systems on the aluminum basis, which contain quasiperiodic and related periodic phases

Українська версія

Thesis for the degree of Candidate of Sciences (CSc)

State registration number

0402U000301

Applicant for

Specialization

  • 02.00.04 - Фізична хімія

14-01-2002

Specialized Academic Board

Д 26.001.03

Taras Shevchenko National University of Kyiv

Essay

Phase equilibria in the binary Al-Pd, Al-Rh alloy systems and the ternary Al-Pd-Co, Al-Pd-Mn, Al-Cu-Rh alloy systems in the vicinity of quasicrystalline and related crystalline phases (so called approximants) in the Al-rich compositional range (more than 50 at.% Al) were investigated. Polythermal sections for the binary alloy sections in the compositional range more than 50 at.% Al and isothermal sections for the ternary alloy systems in Al-rich range at different temperatures were constructed. New intermediate phases obtained in the investigated systems were structurally characterized with X-ray analysis and electron diffraction method (transmission electron microscopy). Basing on the literature data and own experimental results the conclusion was made that an electon concentration is actually the necessary condition for the quasicrystaline structure to exist. But only the certain structure of atomic clusters with noncrystallographic symmetry which build quasicrystalline structure, together with their special arrangement in space and their special electron concentration lead to decreasing of the general energy of quasicrystal electron system and therefore to the stabilization of that structure.

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