Characteristics of phase nucleation and growth during oriented crystallization of alloys of the Si-TaSi/sub 2/ and Si-NbSi/sub 2/ eutectic systems

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:5975758

Grabovetskaya, G P; Butkevich, L M

The authors investigate the effect of the nucleation conditions and the initial concentration of the components on the nature of the change in the phase composition and structure along the length of the directionally crystallized bars of alloys in the Si-TaSi/sub 2/ and Si-NbSi/sub 2/ eutectic systems. The compositions of the investigated alloys are given. The starting materials were silicon of semiconductor purity, tantalum, and niobium produced by electron beam melting. The alloys were crystallized directionally by the Czochralski method. The nature of the structure and the volume ratio of the phases in the investigated alloys depend significantly on the type of seed, i.e., on the nucleation conditions of the eutectic grain. The basic phases in the eutectic alloys of the Si-TaSi/sub 2/ and Si-NbSi/sub 2/ systems are the disilicides TaSi/sub 2/ and NbSi/sub 2/ respectively.

• Research Organization: Tomsk State Univ., USSR
• OSTI ID: 5975758
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Journal Name: Inorg. Mater. (Engl. Transl.); (United States) Vol. 23:2; ISSN INOMA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
COHERENT SCATTERING
CRYSTAL GROWTH METHODS
CRYSTAL STRUCTURE
CRYSTALLIZATION
CZOCHRALSKI METHOD
DIFFRACTION
DIFFUSION
ELEMENTS
EUTECTICS
FIBERS
GRAIN ORIENTATION
MICROSTRUCTURE
NIOBIUM COMPOUNDS
NIOBIUM SILICIDES
NUCLEATION
ORIENTATION
PHASE STUDIES
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SCATTERING
SEMIMETALS
SILICIDES
SILICON
SILICON COMPOUNDS
TANTALUM COMPOUNDS
TANTALUM SILICIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION