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

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

Research output: Contribution to journalConference articlepeer-review

5 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 μm3 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 ΔK1.16 and da/dN approx. 3.7 × 10-8 ΔK0.5, 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 ΔKeff, by the effect of crack closure.

Original languageEnglish
Pages (from-to)247-252
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - 2000 Dec 1
EventMaterials Science of Microelectromechanical Systems (MEMS) Devices II - Boaton, MA, USA
Duration: 1999 Nov 291999 Dec 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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