Materials Transactions Online

Transactions of the Japan Institute of Metals, Vol. 21 No. 2 (1980) pp.89-98
© 1980 The Japan Institute of Metals

Effect of Crystal Boundaries on the Initiation of Fatigue Cracks in Aluminum Bicrystals*

Genjiro Mima**, Fukuji Inoko***
and Ken Atagi**

Four types of aluminum bicrystals having a longitudinal twist boundary parallel to the {111} plane and with a misfit angle of about 0.38 rad (22°) were grown by a modified Bridgman method. The fatigue tests were done on a bending fatigue testing machine and carried out at a constant strain amplitude of about 0.2% and cyclic frequencies of 30.4 Hz.
It has been found that fatigue cracks are initiated along the crystal boundaries. The initiation of the fatigue cracks along the crystal boundaries is due to the operation of the secondary slip systems whose slip planes are parallel to the crystal boundary one.

(Received September 3, 1979)

*This paper was published originally in Japanese in Journal of the Japan Inst. of Metals, 42 (1978), 887.
**Anan Technical College, Anan 774, Japan.
***Department of Production Mechanics, Technical College, The University of Tokushima, Tokushima 770, Japan.

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