The dependence of yield strength on lamellar termination density in Co-CoAl eutectic alloys

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The compressive yield strength of directionally solidified Co-CoAl eutectic alloys was measured in specimens containing a range of lamellar termination densities but at approximately a constant interlamellar spacing. The yield strength was found to decrease as the transverse lamellar termination density increased. A linear dependence of yield strength on the distance between the terminations is observed provided the spacing between terminations is less than 500 μ. For spacings greater than this, the yield strength is approximately constant. These observations are attributed to a relaxation in constraint on deformation between the two phases due to the initiation of enhanced slip in the vicinity of the terminations. © 1985.

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Acta Metallurgica