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Abstract
Strength, hardness, and ductility characteristics were determined for a series of palladium-copper alloys that compositionally vary from 5 to 25 weight percent copper. Alloy specimens subjected to vacuum annealing showed clear evidence of solid solution strengthening. These specimens showed, as a function of increasing copper content, increased yield strength, ultimate strength, and Vickers microhardness, while their ductility was little affected by compositional differences. Annealed alloy specimens subsequently subjected to exposure to hydrogen at 323 K and PH2 = 1 atm showed evidence of hydrogen embrittlement up to a composition of ~15 wt. % Cu. The magnitude of the hydrogen embrittlement decreased with increasing copper content in the alloy.
Highlights
If you Google the phrase “uses of hydrogen”, you quickly appreciate how versatile and important a substance hydrogen is
If one is to appreciate the effects of hydrogen exposure on the mechanical properties of palladium-copper alloys, it seems obvious that baseline values of the mechanical properties are needed
The present results indicate that significant solid solution strengthening occurs in palladium-copper alloys with copper contents up to 25 weight percent
Summary
If you Google the phrase “uses of hydrogen”, you quickly appreciate how versatile and important a substance hydrogen is. In addition to its many industrial uses, hydrogen’s use in energy related areas of science and technology is of critical importance. As a primary energy carrier, hydrogen has risen in prominence in the areas of fuel cell development and vehicle design. For all the attractive features possessed by hydrogen as an alternative energy carrier to fossil fuels, there are lingering issues that need to be addressed. One impediment to the use of hydrogen as an energy carrier is its safe storage. Another issue with the use of hydrogen as an energy carrier is the need to purify the hydrogen from impure sources (such as during steam methane reforming)
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