Abstract

The Einstein flux equation is used to predict the apparent temperature hysteresis in hydride precipitation and dissolution in zirconium alloys first observed in 1964. The new interpretation is consistent with Gibbs’ Phase Rule: there can be only one solvus. X-ray diffraction of the remnant hydride record from fracture surfaces of Zr-2.5Nb after delayed hydride cracking showed no dependence on the approach to the test temperature, which is consistent with the predictions of the Einstein flux equation.

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