期刊
SCRIPTA MATERIALIA
卷 54, 期 3, 页码 355-361出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2005.10.007
关键词
metallic glasses; fatigue; shear bands; damage
Cyclic fatigue was investigated in metallic glasses using fracture mechanics-based crack-growth and stress-life experiments. Steady-state crack growth in a Zr-based bulk metallic glass occurred with a Paris law exponent of similar to 1.5. Growing planar fatigue cracks were often noted to destabilize into a wavy crack front geometry, and the conditions determining the stability of these cracks are analyzed. Transient crack-growth rates were measured during variable-amplitude fatigue. Stress-life experiments showed low endurance limits. Fatigue damage initiated at an angle to the applied load, but changed direction at a critical length and grew as mode I cracks. However, the initiation stage of fatigue damage was very short, and almost the entire fatigue life was spent in the crack-growth stage. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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