Comparison of fatigue lives between grain boundaries and component single crystals of copper bicrystals
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Z. F. Zhang
und
Z. G. Wang
Abstract
Fatigue lives of grain boundaries (GBs) and component crystals were measured by using [123]/[335] and [5 9 13]/ [579] Cu bicrystals with a perpendicular GB at room temperature in air. The results show that the GBs were always the preferential sites for fatigue crack initiation and propagation in the two groups of bicrystals under cyclic tensiontension loading as well as push-pull straining control. When an [123]/[335] bicrystal with reduced section area was tested by cyclic tension-tension loading, the [335] component crystal always had a relatively higher fatigue life than the [123] component crystal. As a result, the fatigue life increased in the order of GB, [123] and [335] component crystals. When the two groups of bicrystals were subjected to cyclic push-pull straining, the GB of the [5 9 13]/[579] bicrystal showed a higher fatigue life than that of the [123]/[335] bicrystal, which was suggested to be partially attributed to the difference in the component crystal orientations in the two bicrystals. By using scanning electron microscopy and electron channeling contrast techniques, the fatigue damage features on the surfaces and fatigue fractography were examined. Based on the present results, the fatigue cracking mechanisms along GBs and persistent slip bands in Cu bicrystals are discussed.
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This work was financially supported by the Special Funding for the National 100 Excellent Ph. D. Thesis provided by the Chinese Academy of Sciences. One of the authors (Z. F. Z.) wishes to acknowledge the Alexander von Humboldt Foundation for providing a postdoctoral fellowship.
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© 2002 Carl Hanser Verlag, München
Artikel in diesem Heft
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- Notifications/Mitteilungen
- Personal/Personelles
- Information
- Conferences/Konferenzen
Artikel in diesem Heft
- Frontmatter
- Articles/Aufsätze
- Niobium bulk and grain boundary diffusion in alpha-iron
- Comparison of fatigue lives between grain boundaries and component single crystals of copper bicrystals
- Interfacial reaction between liquid Sn-20In-2.8Ag solder and Ag substrate
- Modelling the continuous cooling transformation diagram of engineering steels using neural networks
- Modelling the continuous cooling transformation diagram of engineering steels using neural networks
- Characterization of the metastable austenite in low-alloy FeCMnSi TRIP-aided steel by neutron diffraction
- Self-organized criticality – a model for recrystallization?
- Strain softening effects in texture and microstructure of torsioned pre-deformed Al rods
- Microstructural evolution in as-cast hypereutectic Al-Si alloys with different La additions
- Wear behaviour of graphitic aluminium composite sliding under dry conditions
- Temperature dependence of Young’s Modulus of alumina short fiber reinforced Zn–Al MMCs produced by pressure die-casting
- Notifications/Mitteilungen
- Personal/Personelles
- Information
- Conferences/Konferenzen
