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Fracture Behavior of Micro-Sized Ni-P Amorphous Alloy Specimens

Published online by Cambridge University Press:  10 February 2011

Y. Ichikawa ,
S. Maekawa ,
K. Takashima ,
M. Shimojo ,
Y. Higo  and
M. V. Swain
Y. Ichikawa
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, yichikawa64@pi.titech.ac.jp
S. Maekawa
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, yichikawa64@pi.titech.ac.jp
K. Takashima
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, yichikawa64@pi.titech.ac.jp
M. Shimojo
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, yichikawa64@pi.titech.ac.jp
Y. Higo
Affiliation:
Precision and Intelligence Laboratory, Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan, yichikawa64@pi.titech.ac.jp
M. V. Swain
Affiliation:
Biomaterials Science Research Unit, University of Sydney, Australian Technology Park Eveleigh, NSW 1490, Australia
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Abstract

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 μtm and the other has a fatigue pre-crack. The shapes of the loaddisplacement 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 605: Symposium MM – Materials Science of Microelectromechanical Systems Devices II , 1999 , 273
Copyright
Copyright © Materials Research Society 2000

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