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Abstract
Abstract The kinetics of degassing and reverse β→α hydride transformation initiated in the unstrengthened β-hydride of Pd in the thermodynamically open Pd–H system is studied. An isothermal kinetic diagram was constructed and its shape was similar to those of transformations in steel during heating. With optical microscopy in situ and video-registration methods the morphology of new α-phase precipitations is studied. It is shown that the process of α-phase generation in subsurface layers depends on the orientation of the grain crystal lattice to the surface. α-Phase nuclei grow in borders of the grain in which they were generated. It is shown that hydrogen macro-stresses may be generated throughout the whole volume of the β-hydride sample and they relax by means of grain borders appearance (mutual grains displacement). During the process of β→α transformation local internal hydrogen stresses may slow down both degassing and β→α transformation.
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