Abstract
The creep properties at 825°C of the directionally solidified eutectic (Co, Cr)(Co, Cr)7C3 have been investigated for uniaxial stresses applied at various angles α to the direction of fibre alignment. There is a systematic deterioration in creep properties as α increases from 0 to 90°, the stress to rupture in 100 h decreasing from 254 to 107 MPa. Creep ductility increases both with increasing α and with decreasing stress. The stress exponent n relating minimum creep rate to stress varies little over the range of orientation, having a constant value of 5.5 ± 1. The major benefit of fibre reinforcement is found when α is <∼15°. This observation is consistent with a simple model of the creep mechanism.
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