It used to be thought that addition of carbon to Fe–Cu compacts inhibited compact growth by reducing solubility of copper in iron, but this effect is in fact slight. The theory that formation of Fe–Cu–C ternary liquid phase promoted shrinkage by liquid phase sintering has also been discounted. It has more recently been shown that carbon additions reduce growth by preventing boundary penetration of iron by copper. The present study verifies the importance of the proportion of high and low dihedral angles which the copper phase forms with γ-iron: carbon inhibits compact growth by causing these angles to increase. PM/0516
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References
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GummessonP. U. and FORSSL.: Proc. 11th Annual Meeting of the Metal Powder Association, 1955, 56.
