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Article: Evolution of Slip Morphology and Fatigue Crack Initiation in Surface Grains of Ni200
- Article from:
- Metallurgical and Materials Transactions
- Article date:
- November 1, 2009
- Author:
CopyrightCopyright Minerals, Metals & Materials Society Nov 2009. Provided by ProQuest LLC. (Hide copyright information)
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The evolution of slipbands into fatigue cracks in surface grains of commercially pure Ni. Ni200 (99.35Ni-0.4Fe-0.25Cu. in wt pct), was studied at ambient temperature. Round-bar specimens with electropolished surfaces were fatigued under displacement-controlled, fully reversed conditions at four strain amplitudes under a nominal strain rate of 1 Ã 10^sup -3^ s^sup -1^. Low-cycle fatigue tests were periodically interrupted to characterize the slip morphology at various fatigue cycles using scanning electron microscopy. The results showed that the distribution of slip in Ni200 varied considerably in individual surface grains at a given strain amplitude. Some grains were deformed more severely ...
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