Stabilization of Lattice Defects in HPT-Deformed Palladium Hydride

Abstract:

Recent investigations on palladium hydride (Pd-H) showed, for the first time, evidence of formation of vacancy-hydrogen (Vac-H) clusters during Severe Plastic Deformation (SPD) effected by High Pressure Torsion (HPT). Vacancy concentrations produced in Pd-H by this method are extraordinarily high. DSC-scans show that the thermal stability range of vacancies is extended by about 150K due to trapping of hydrogen leading to the formation of vacancy-hydrogen clusters. Recent experiments give evidence that the mobility of the H atoms and/or the vacancies is conditional for the formation of Vac-H clusters during HPT. Results furthermore indicate defect stabilization by hydrogen trapping not only for vacancy-type defects but also for dislocations and grain boundaries.

• Periodical: Materials Science Forum (Volumes 667-669)
• Pages: 427-432
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.667-669.427
• Online since: December 2010
• Authors: Matthias Bönisch, Michael Josef Zehetbauer, Maciej Krystian, Daria Setman, Gerhard Krexner
• Keywords: Differential Scanning Calorimetry (DSC), High Pressure Torsion (HPT), Hydrogen, Lattice Defect, Trapping, Vacancy

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