Thermal and mechanical stability of a Ni/sub 55/Cr/sub 5/Nb/sub 40/ metallic glass
Differential scanning calorimetry temperature dependence of ductility and hardness and stress relaxation measurements have been employed to study thermal and mechanical stability. The results are compared with data reported for Ni/sub 60/Nb/sub 40/ glass to ascertain the effects of Cr addition. Crystallization temperature and activation energy for crystallization of Ni/sub 55/Cr/sub 5/Nb/sub 40/ glass are less than that of the binary alloy. Annealing embrittlement is observed in the ternary glass, however, ductile-brittle transition temperature is reduced by Cr. Hardness increases on annealing and follows a behaviour similar to that of embrittlement. Kinetic studies of annealing embrittlement and stress relaxation yield activation energies for structural relaxation. These values are smaller than for Ni/sub 60/Nb/sub 40/.
- Research Organization:
- Defence Metallurgical Research Lab., P.O. Kanchanbagh, Hyderabad-500 258 (IN)
- OSTI ID:
- 7008964
- Journal Information:
- Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 34:7; ISSN AMETA
- Country of Publication:
- United States
- Language:
- English
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360202 -- Ceramics
Cermets
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360203 -- Ceramics
Cermets
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360204* -- Ceramics
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ACTIVATION ENERGY
ANNEALING
CALORIMETRY
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHROMIUM COMPOUNDS
CRYSTALLIZATION
DUCTILE-BRITTLE TRANSITIONS
DUCTILITY
EMBRITTLEMENT
ENERGY
GLASS
HARDNESS
HEAT TREATMENTS
KINETICS
MECHANICAL PROPERTIES
NICKEL COMPOUNDS
NIOBIUM COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
RELAXATION
STABILITY
STRESS RELAXATION
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS