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| Size Effects On Deformation And Fatigue Behavior Of A Micron-Sized Stainless Steel |
| ZHANG Guangping;TAKASHIMA Kazuki; HIGO Yakichi |
| Shenyang National Laboratory for Materials Science; Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016 |
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Cite this article:
ZHANG Guangping; TAKASHIMA Kazuki; HIGO Yakichi. Size Effects On Deformation And Fatigue Behavior Of A Micron-Sized Stainless Steel. Acta Metall Sin, 2005, 41(4): 337-341 .
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Abstract Micron-sized cantilever beams of a 304 stainless steel were fabricated by focused-ion-beam
(FIB). The static bending and dynamic bending tests of the microbeams were carried out. The
results show that with decreasing the beam thickness, the yield strength of the microbeam
increases and the ductility decreases. The relation between the yield strength of the microbeam
and beam thickness is similar to the Hall-Petch relation of the grain size strengthening. The
increase in the yield strength of the thinner microbeam is attributed to the increase in the strain
gradient contribution due to inhomogeneous deformation of the small dimensional material. The
decrease in the ductility of the microbeam is attributed to fewer mobile dislocations in the grain.
The threshold of the fatigue crack initiation from the notch of the microbeam is close to that of
the bulk material.
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Received: 22 June 2004
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