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    STP1169

    Internal Friction and Young's Modulus Measurements in Zr-2.5Nb Alloy Doped with Hydrogen

    Published: 01 January 1992


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    Abstract

    The presence of hydrides is an important factor in assessing the potential for delayed hydride cracking in Zr-2.5Nb alloys, and consequently, the terminal solid solubility (TSS) of hydrogen in the material is an important parameter. In pure zirconium doped with hydrogen, the TSS is marked by a dissolution peak of internal friction on heating and a truncated precipitation peak associated with hydride nucleation on cooling. These phenomena occur only at low frequencies and are accompanied in torsion pendulum studies by autotwisting of the sample (or zero-point drift) that stops abruptly at the TSS. Neither the dissolution/precipitation peaks nor the autotwisting phenomena are observed in Zr-2.5Nb. However, the TSS is also marked by an abrupt change in the slope of Young's modulus as a function of temperature. This phenomenon is observed regardless of the frequency (in the range 1 Hz to 120 kHz) and in both pure zirconium and Zr-2.5Nb alloys. The reasons for the absence of the dissolution/precipitation peak in Zr-2.5Nb alloys are discussed and the use of Young's modulus changes to investigate the TSS of hydrogen and the hysteresis between heat-up and cool-down TSS curves is demonstrated.

    Keywords:

    terminal solid solubility, hydrogen, zirconium, zirconium alloys, dissolution peaks, nucleation peaks, autotwisting, internal friction, Young's modulus, internal stress, materials damping, mechanical properties


    Author Information:

    Ritchie, IG
    Senior scientist and scientist, AECL Research, Whiteshell Laboratories, Pinawa, Manitoba

    Pan, Z-L
    Senior scientist and scientist, AECL Research, Whiteshell Laboratories, Pinawa, Manitoba


    Committee/Subcommittee: E28.10

    DOI: 10.1520/STP17973S