Fatigue of a Zr-Ti-Cu-Ni-Be bulk amorphous metal: Stress/life and crack-growth behavior
- Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering
In sharp contrast to oxide glasses, bulk metallic glasses can be surprisingly ductile. For example, recent experiments on a bulk Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5} (at%) alloy have demonstrated that amorphous metals can exhibit fracture toughnesses as high as {approximately} 55 MPa {radical}m, although mechanistically this result is not understood. Recent results also show fatigue-crack growth properties comparable to that of high-strength steels and aluminum alloys. However, corresponding stress/life (S/N) behavior on smooth-bar, nominally crack-free specimens, which are traditionally used to assess total life and crack initiation characteristics, have to date not been investigated in bulk amorphous metals. Accordingly, the current study is focused on the S/N behavior of a bulk amorphous Zr-Ti-Cu-Ni-Be alloy, with the objective of examining the relationship between fatigue crack initiation and propagation in comparison to behavior in traditional crystalline alloys.
- Sponsoring Organization:
- Department of the Air Force, Washington, DC (United States)
- OSTI ID:
- 611559
- Journal Information:
- Scripta Materialia, Vol. 38, Issue 4; Other Information: PBD: 13 Jan 1998
- Country of Publication:
- United States
- Language:
- English
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