Abstract
The method of zero creep utilizing the concept of balance of surface tension in thin wires, and the observation of twin boundary-grain boundary intersections in thin foils have been combined in a simultaneous measurement of absolute (average) interfacial free energies in 80 20 NiCr (Chromel-A) at 1060 °C. Using optical microscopy and scanning electron microscopy to measure and identify equilibrium grain lengths and wire diameters, and transmission electron (projection shadowgraph) microscopy to accurately determine the dihedral angles at the intersection of grain boundaries with the wire surface, the surface and grain boundary free energies were measured to be 1960 and 680 erg cm 2 respectively. From measurements of a representative number of low-torque twin-grain boundary inter sections in thin foils by transmission electron microscopy, the twin boundary free energy was calculated to be 17 erg cm 2 from a relative twin/grain boundary free energy ratio of 0.025.
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