Abstract
A RECENT investigation1 of the Zr–Hf–H equilibrium system at pressures less than one atmosphere of hydrogen gas revealed the presence of hysteresis. Although this was not unexpected2, it was somewhat disconcerting and demanded further elucidation. Results presented here will show that: (1) decomposition pressure hysteresis must be considered when dealing with equilibrium between gases and multi-component alloy systems; (2) hysteresis always involved a region of more than one phase and was most prominent at lower temperatures where diffusion was slowest; (3) no evidence for an interfering surface film was found; (4) internal factors such as stress and large surface area accompanying a martensitic reaction are prominent in the hysteresis reactions of the Zr–Hf–H system.
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KATZ, O., ALFRED BERGER, J. Decomposition Pressure Hysteresis in the Zirconium-Hafnium-Hydrogen System. Nature 203, 1163–1165 (1964). https://doi.org/10.1038/2031163b0
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DOI: https://doi.org/10.1038/2031163b0
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