Newtonian flow in bulk amorphous alloys
Bulk amorphous alloys have many unique properties, e.g., superior strength and hardness, excellent corrosion resistance, reduced sliding friction and improved wear resistance, and easy formability in a viscous state. These properties, and particularly easy formability, are expected to lead to applications in the fields of near-net-shape fabrication of structural components. Whereas large tensile ductility has generally been observed in the supercooled liquid region in metallic glasses, the exact deformation mechanism, and in particular whether such alloys deform by Newtonian viscous flow, remains a controversial issue. In this paper, existing data are analyzed and an interpretation for the apparent controversy is offered. In addition, new results obtained from an amorphous alloy (composition: Zr-10Al-5Ti-17.9Cu-14.6Ni, in at. %) are presented. Structural evolution during plastic deformation is particularly characterized. It is suggested that the appearance of non-Newtonian behavior is a result of the concurrent crystallization of the amorphous structure during deformation.
- Research Organization:
- Lawrence Livermore National Lab., CA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 20104669
- Resource Relation:
- Conference: 1999 Materials Research Society Fall Meeting, Boston, MA (US), 11/29/1999--12/01/1999; Other Information: PBD: 2000; Related Information: In: Superplasticity -- Current status and future potential. Materials Research Society symposium proceedings, Volume 601, by Berbon, P.B.; Berbon, M.Z.; Sakuma, T.; Langdon, T.G. [eds.], 386 pages.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Nano-scratch behavior of a bulk Zr-10Al-5Ti-17.9Cu-14.6Ni amorphous alloy
Superplastic behavior of a Zr-10Al-5Ti-17.9Cu-14.6Ni metallic glass in the supercooled liquid region