Non-Newtonian plastic flow of a Ni-Si-B metallic glass at low stresses
The problem of the rheological behavior of metallic glasses (MGs) is quite important both from theoretical and practical viewpoints. Early experiments carried out on MGs at temperatures T > 300 K using low shear stress levels revealed plastic flow to be Newtonian while measurements at relative high shear stresses (more than 200 to 400 MPa, depending on temperature, thermal prehistory of samples and chemical composition) indicated a non-linear behavior with 1 < m < 12. Numerous investigations performed later both on as-cast and relaxed MGs of various chemical compositions using a number of testing methods (tensile creep, tensile and bend stress relaxation) showed that a transition from Newtonian behavior at low stresses to a non-linear flow at high stresses was observed. At present, such a situation is considered to be generally accepted. The authors performed precise creep measurements of a Ni-Si-B metallic glass. The results obtained indicate that plastic flow in this case at low tensile stress (12 {le} {sigma} {le} 307 MPa) is clearly non-Newtonian and, consequently, the viscosity is stress dependent.
- Research Organization:
- State Pedagogical Univ., Voronezh (RU)
- OSTI ID:
- 20023121
- Journal Information:
- Scripta Materialia, Vol. 39, Issue 10; Other Information: PBD: 13 Oct 1998; ISSN 1359-6462
- Country of Publication:
- United States
- Language:
- English
Similar Records
Heat Transfer in Complex Fluids
Recommendations for rheological testing and modelling of DWPF melter feed slurries