Effects of hydrogen exposure temperature on the tensile strength, microhardness and ductility of Pd/Ag (25wt.%) alloy

Strength, Hardness, and Ductility Evidence of Solid Solution Strengthening and Limited Hydrogen Embrittlement in the Alloy System Palladium-Copper (Cu wt. % 5–25)

“…With respect to the resistance of palladium-silver alloys to hydrogen embrittlement, most studies done in this area have been qualitative or, at best, limited in their quantitative characterization. However, several authors of the present investigation have carried out rigorous quantitative studies on hydrogen embrittlement in palladium-silver alloys [15][16][17][18]. These studies have indeed found that alloying palladium with silver can result in significant reduction in the susceptibility of the metal matrix to the damaging effects of hydrogen embrittlement.…”

“…It has been suggested that an important factor in the resistance to hydrogen embrittlement in certain palladium-based alloy systems is a suppression of a discontinuous phase transition from a dilute solution of hydrogen in the alloy matrix (referred to as the α phase) to a dense solution of hydrogen in the alloy matrix, referred to as a β hydride phase. Several authors of the current study have offered a detailed explanation of the suppression of the α to β phase transition in the palladium-silver-hydrogen system [15][16][17][18]20]. Since the details of the explanation of the suppression of the α to β phase transition are available elsewhere, we will offer a more cursory explanation here for the palladium-copper alloy system.…”

“…With fewer dislocations being generated, the strength, hardness, and ductility parameters of the hydrogen-cycled alloy matrix will be less impacted by hydrogen exposure. The suppression of the miscibility gap in the palladium-silver-hydrogen system and its impact on the mechanical properties of the palladium-silver alloy matrix has been thoroughly characterized for alloys up to a silver content of 25 weight percent silver [15][16][17][18]. Pressure-composition isotherms, x-ray diffraction, and electrical resistance studies have been used to investigate the suppression of the miscibility gap in the palladiumcopper-hydrogen system [29][30][31][32].…”

Nanoindentation of palladium–hydrogen

“…Changes were also reported in the hardness, with increases apparently resulting from both a / b and b / a transformations. Recent work has furthered this [6] and studied the mechanical effects of the cycling temperature [7,8]. The report of reduced stiffness was confirmed by a more recent study [9] based on using micro-cantilevers to measure resonance frequencies under a controllable hydrogen atmosphere.…”

Thermodynamic Assessment of a Solar-Driven Integrated Membrane Reactor for Ethanol Steam Reforming

“…Among them, dense metallic membranes offer high selectively and H 2 permeance. In particular, Pd-Ag membranes are studied because of the ability to inhibit hydrogen embrittlement at lower temperatures [18][19][20]. Pd-Ag membranes are commonly fabricated on porous ceramic supports, which allows them to withstand a high-pressure difference between the two sides of the membrane [21].…”