日本金属学会誌

J. Japan Inst. Metals, Vol. 49, No. 9 (1985),
pp. 723-728

Effect of Inclination of Slip Planes on Fatigue Crack Initiation along Grain Boundaries in Aluminum Bicrystals

Ken Atagi1, Fukuji Inoko2 and Genjiro Mima3

1Anan Technical College, Anan
2Technical College, The University of Tokushima, Tokushima
3Anan Technical College, Anan. Now Emeritus Professor of Osaka University

Abstract:

In order to examine the initiation of fatigue cracks along grain boundaries, three kinds of aluminum bicrystals were tested by bending fatigue under a constant strain amplitude of 0.2% and a cyclic frequency of 30.4 Hz.
It has been found that the initiation of fatigue cracks along the boundaries occurs under the following conditions: (a) 111 in at least one component crystal is parallel to the boundary plane (it is not always necessary for 111 in the other component crystal to be parallel to the boundary plane) and (b) the slip system parallel to the boundary plane is remarkably activated in the vicinity of the boundary.


(Received 1985/5/20)

Keywords:

bending fatigue, aluminum bicrystal, crack initiation along boundary, constant amplitude, slip plane parallel to boundary plane


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