Deformation-induced amorphization of crystalline particles in a Cu-Ti metallic glass

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7156532

Kamenetzky, E A; Askenazy, P D; Tanner, L E; Johnson, W L

Crystalline particles and grains embedded in Cu/sub 35/Ti/sub 65/ glass ribbons have been amorphized by isothermal cold rolling. The structural evolution has been studied by x-ray diffraction and TEM techniques. Initial particle morphologies are spherulitic and spherical, the latter with sizes ranging between 10 and 100 nm. The new amorphous phase seems to nucleate at crystalline-amorphous matrix interfaces. Initially there is a well-defined interface between the new and the existing amorphous phases but it disappears as rolling progresses. Crystallites on a nanoscale still present in the final stages of particle amorphization have been observed by convergent beam electron diffraction. After sufficient deformation the consolidated ribbon becomes completely glassy. A morphological description of the transformation process in terms of crystal destabilization and solid-state particle melting is presented.

• Research Organization: Lawrence Berkeley Lab., CA (USA); California Inst. of Tech., Pasadena (USA). W.M. Keck Lab. of Engineering Materials; Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: FG03-86ER45242; W-7405-ENG-48; AC03-76SF00098
• OSTI ID: 7156532
• Report Number(s): LBL-22787; CONF-861207-74; ON: DE87006138
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
AMORPHOUS STATE
COHERENT SCATTERING
COPPER ALLOYS
CRYSTAL STRUCTURE
DEFORMATION
DIFFRACTION
ELECTRON MICROSCOPY
FABRICATION
MATERIALS WORKING
METALLIC GLASSES
MICROSCOPY
MICROSTRUCTURE
ROLLING
SCATTERING
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
VITRIFICATION
X-RAY DIFFRACTION