Change of viscosity during structural relaxation of amorphous Fe/sub 40/Ni/sub 40/B/sub 20/

Journal Article · Fri Feb 28 23:00:00 EST 1986 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(86)90084-2· OSTI ID:5002283

Van den Beukel, A; Huizer, E; Mulder, A L; Van den Zwaag, S

Measurements of viscosity as a function of time and temperature have been carried out in a temperature range where structural relaxation occurs (450-600 K). Analysis shows different behavior in two temperature ranges: (1) Range I (520-600 K). In this range changes of viscosity can be described in terms of the annealing out of flow defects (TSRO). The activation energy for motion and annihilation of the flow defects is Q = 250 kJmol. The isoconfigurational viscosity is temperature dependent according to eta -- exp(QRT) with Q/sub eta/ = 304 kJmol. A possible explanation for the difference between Q and Q/sub eta/ is proposed. (2) Range II (<520K). Here the isoconfigurational ln eta vs T/sup -1/ plots yield an activation energy of about 250 kJmol, close to the value for annihilation of flow defects. The increase of viscosity observed in this range is ascribed to an increase of chemical order.

• Research Organization: Lab. of Metallurgy, Delft Univ. of Technology, Rotterdamseweg 137, 2628 AL Delft (NL)
• OSTI ID: 5002283
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 34:3; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals &amp; Alloys-- Structure &amp; Phase Studies
360103 -- Metals &amp; Alloys-- Mechanical Properties
ACTIVATION ENERGY
ALLOY SYSTEMS
ALLOYS
AMORPHOUS STATE
BORON ALLOYS
ENERGY
IRON ALLOYS
NICKEL ALLOYS
RELAXATION
STRESS ANALYSIS
STRESS RELAXATION
STRESSES
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE EFFECTS
TERNARY ALLOY SYSTEMS
THERMAL STRESSES
VISCOSITY