Fracture behavior of micro-sized Ni-P Amorphous alloy specimens has been investigated using a newly developed mechanical testing machine. Specimens with dimensions of 10 × 12 × 50 μm were prepared by focused ion beam machining. Two types of specimens with different crack geometries were prepared. One specimen has a notch with root radius is 0.25 μm and the other has a fatigue pre-crack. The shapes of the load-displacement curves are different for each type of specimen. The fracture strength of the specimens with a notch is higher than that with a fatigue pre-crack and the fracture surfaces of the specimens are also different for each type of specimen. This may be due to the difference in stress concentration at the crack (notch) tip, and indicates that even a notch with a root radius of 0.25 μm is not able to be regarded as a crack for micro-sized specimens. Therefore, the introduction of a fatigue pre-crack is essential for the evaluation of fracture toughness for such micro-sized specimens.
|ジャーナル||Materials Research Society Symposium - Proceedings|
|出版ステータス||Published - 2000|
|イベント||Materials Science of Microelectromechanical Systems (MEMS) Devices II - Boaton, MA, USA|
継続期間: 1999 11 29 → 1999 12 1
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