Crystallization and glass formation in electron and laser beam irradiated Cu-Zr alloys

Conference · Sun Nov 01 04:00:00 EST 1987

OSTI ID:5614801

Huang, J S; Kaufmann, E N; Wall, M A; Olsen, B L

Four Cu-Zr alloys, Cu/sub 56/Zr/sub 44/, Cu/sub 50/Zr/sub 50/, Cu/sub 47/Zr/sub 53/, and Cu/sub 33/Zr/sub 67/, were surface melted with electron and pulsed laser beams to compare their kinetics of nucleation, growth and glass formation. It was observed that the ease of glass formation increased in the order: Cu/sub 33/Zr/sub 67/, Cu/sub 47/Zr/sub 53/, Cu/sub 56/Zr/sub 44/, and Cu/sub 50/Zr/sub 50/. The nucleation and regrowth produced different metastable phases. At the equiatomic composition, the preferred phase is a CsCl-type (B2) BCC structure. As the composition deviates from this, the preferred phase is either orthorhombic or tetragonal with a much larger unit cell not previously reported in the literature. The maximum growth velocity of these metastable phases was found to be about 0.025 m/s. The slow kinetics are responsible for the ease of glass formation in these systems. 4 refs., 7 figs., 2 tabs.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5614801
• Report Number(s): UCRL-96793; CONF-871124-32; ON: DE88003390
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360106 -- Metals & Alloys-- Radiation Effects
ALLOYS
BCC LATTICES
COOLING
COPPER ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALLIZATION
CUBIC LATTICES
ELECTRON BEAM MELTING
ENERGY LEVELS
EXCITED STATES
GLASS
HEATING
KINETICS
LASER-RADIATION HEATING
MELTING
METASTABLE STATES
MICROSTRUCTURE
NUCLEATION
ORTHORHOMBIC LATTICES
PHASE TRANSFORMATIONS
PLASMA HEATING
SUPERLATTICES
TETRAGONAL LATTICES
VITRIFICATION
ZIRCONIUM ALLOYS