日本金属学会誌

J. Japan Inst. Metals, Vol. 32, No. 6 (1968),
pp. 559-565

On Fatigue Fracture in Pure α-Titanium—A Study by Electron Fractography—

Muneaki Shimura1 and Yoshihiro Shinohara2

1The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai
2Student,Department of Metallurgy,Faculty of Engineering,Tohoku University, Sendai

Abstract:

A study by electron fractography has been made of fatigue fracture at low amplitude and room temperature in pure α-titanium. There are three modes of fracture topography that are characteristic of the mechanisms of fracture operating during the propagation of cracks. The first mode topography, corresponding to the initial shear mode crack growth stage, is composed of the facets with deformation marking and the steps which is related to the deformation twinning near the crack tip. The second mode topography, corresponding to the next intermediate growth stage exhibits very little steps, scale-like structure and obscure striations on the wide facets and presents an appearance of cleavage fracture. The third mode topography, corresponding to the final tensile mode crack growth, shows ductile striations normal to the direction of crack growth. The striations are nearly always straight and are hardly influenced by grain-boundaries, sub-boundaries and twin-boundaries.


(Received 1967/12/28)

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