Dilatometer for the in situ observation of high-temperature, high-pressure hydrogen attack.
A differential dilatometer capable of detecting volume changes of 1 part in 10(5) in specimens exposed to a hydrogen atmosphere at 6.2 MPa and 500 degrees C is described. The swelling of an alloy under hydrogen-attack conditions can be studied over a wide range of hydrogen pressures and temperatures by use of a single specimen.
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Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439.