Abstract
The crystallography and interfacial free energy of noncoherent twin boundaries in copper have been investigated. It is found that the noncoherent twin boundary is approximately parallel to a {113} plane of one crystal and to a {335} plane of the other. The ratio of the interfacial free energy of noncoherent twin boundaries to the average grain boundary free energy in copper is found to be 0.80±0.015. Two measurements by a second method confirm the magnitude of this value.

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