Fatigue properties for micro-sized Ni-P amorphous alloy specimens

S. Maekawa, K. Takashima, Masayuki Shimojo, Y. Higo, M. V. Swain

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


Fatigue crack propagation tests at different stress ratios of 0.1 and 0.5 have been performed on microsized Ni-P amorphous alloy specimens to investigate the influence of stress ratio in the crack growth properties of microsized materials. The specimens tested were cantilever-beam-type with dimensions of 10 × 12 × 50 μm 3 prepared by focused ion beam machining. Notches with a depth of 3 μm were introduced in all specimens. The entire set of fatigue tests as performed using a newly developed fatigue testing machine in air at room temperature. Fine stripes deduced to be striations were observed on the fatigue fracture surface. Careful measurements of the striation spacings were made. Fatigue crack propagation rate, that is striation spacing, is plotted as a function stress intensity factor range. Fatigue crack propagation rate at stress-ratios of 0.1 and 0.5 in microsized Ni-P amorphous alloy specimens are given by da/dN approx. 1.3 × 10 -8 ΔK 1.16 and da/dN approx. 3.7 × 10 -8 ΔK 0.5, respectively. At a given ΔK, crack propagation rate at a stress ratio of 0.5 was higher than that at 0.1. It is considered that a decrease in crack propagation rate at stress ratio of 0.1 is due to a decrease in effective stress intensity factor range ΔK eff, by the effect of crack closure.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Number of pages6
Publication statusPublished - 2000
Externally publishedYes
EventMaterials Science of Microelectromechanical Systems (MEMS) Devices II - Boaton, MA, USA
Duration: 1999 Nov 291999 Dec 1


OtherMaterials Science of Microelectromechanical Systems (MEMS) Devices II
CityBoaton, MA, USA


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Maekawa, S., Takashima, K., Shimojo, M., Higo, Y., & Swain, M. V. (2000). Fatigue properties for micro-sized Ni-P amorphous alloy specimens. In Materials Research Society Symposium - Proceedings (Vol. 605, pp. 247-252). Materials Research Society.