The entering behavior of environmental gases into the plastic zone around fatigue crack tips in titanium

Author: Shimojo M.   Myeong T.   Higo Y.   Iguchi R.  

Publisher: Springer Publishing Company

ISSN: 1543-1940

Source: Metallurgical and Materials Transactions A, Vol.28, Iss.6, 1997-06, pp. : 1341-1346

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Abstract

Fatigue crack growth tests were performed on titanium in vacuum, a nitrogen gas, inert gases (helium and argon), and air. Fracture surface morphologies were different from each other even if these environments were mild. Microcracks which were parallel to the striations were observed on the fracture surfaces, and the frequency of them increased with the environment becoming active (He2