Influence of oxygen and other impurities on the crystallization of NiZr/sub 2/ and related metallic glasses

Journal Article · Thu Jan 01 04:00:00 EST 1987 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.338847· OSTI ID:6816253

Altounian, Z; Batalla, E; Strom-Olsen, J O; Walter, J L

The role of oxygen and other impurities on the crystallization characteristics of Ni-Zr glasses near the composition NiZr/sub 2/, as well as for FeZr/sub 2/, CoZr/sub 2/, and NiHf/sub 2/, has been investigated. For NiZr/sub 2/ glasses with 1 at. % oxygen, the first crystallization product is the metastable E9/sub 3/ structure with a = 1.227 nm instead of the equilibrium C16 structure. A similar effect is found for samples containing approx. >3 at. % B. For FeZr/sub 2/, CoZr/sub 2/, and NiHf/sub 2/ the first crystallization product is also E9/sub 3/ structure, even with very small levels of oxygen (less than or equal to 0.2 at. %). The formation of the E9/sub 3/ structure is always accompanied by an increase in the electrical resistivity, an increase which transmission electron microscopy shows is intrinsic to the phase and unrelated to crystallite size. For Ni/sub 36.5/Zr/sub 63.5/ and Ni/sub 42/Zr/sub 58/ the crystallization is also accompanied by an increase in electrical resistance and the evolution of a crystal structure similar to the E9/sub 3/ structure in the size of the unit cell and packing fraction but with a different space group. We propose that the formation of these structures is triggered by atomic size nuclei of ZrO/sub 2/, (or ZrB/sub 2/) quenched in from the melt.

• Research Organization: Rutherford Physics Building, McGill University, 3600 University Street, Montreal, Quebec, Canada H3A 2T8
• OSTI ID: 6816253
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 61:1; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
COBALT ALLOYS
CRYSTAL STRUCTURE
CRYSTALLIZATION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
HAFNIUM ALLOYS
HAFNIUM BASE ALLOYS
IMPURITIES
IRON ALLOYS
MELTING
METALLIC GLASSES
NICKEL ALLOYS
NONMETALS
OXYGEN
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS