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- W2605394193 startingPage "176" @default.
- W2605394193 abstract "When palladium is coated onto group Va metals such as niobium, the hydrogen absorption rate becomes comparable to that in the diffusion-controlled case, and various problems relevant to the generation of stresses are expected to arise due to the existence of hydrogen concentration gradient during the absorption-desorption cyclings. One of these problems hitherto observed is the occurrence of hydrogen induced rupture during the cyclings carried out at temperatures sufficiently higher than that of α+β→α transition.In order to investigate into these problems in detail, the hydrogen absorption rates were controlled by coating palladium and nickel onto niobium substrates and the resultant specimens were subjected to the hydrogen absorption-desorption cycling at 723 K and PH2≤37 kPa. Following the cycling the topology of the specimen was examined to see whether fracture occurred or not. Then the coated layer was removed and changes in the hardness and X-ray diffraction half-width were measured along the depth direction of the niobium substrate.Results obtained are summarized as follows:(1) Remarkable increase in the hardness of niobium was observed, especially in the vicinity of its surface, when the palladium coated one was subjected to the cycling. On the contrary, increase in the hardness of nickel coated niobium following the cycling was negligibly small.(2) However, when palladium coated niobium was subjected to step by step absorption and desorption, the increase in hardness was also very small.(3) The changes of X-ray diffraction half-width behaved similar to those of hardness. The remarkable increases in both hardness and half-width might be due partly to the stress generation mentioned above.(4) Fracture was observed in palladium coated niobium and not in nickel coated one. It originated from heavy worked regions such as marked or welded zone of niobium, whenever niobium had not been annealed after these working processes." @default.
- W2605394193 created "2017-04-28" @default.
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- W2605394193 date "1982-01-01" @default.
- W2605394193 modified "2023-09-23" @default.
- W2605394193 title "On the Hardening and Fracture Initiation of Palladium and Nickel Coated Niobium Resulting from Hydrogen Absorption-desorption Cycling" @default.
- W2605394193 doi "https://doi.org/10.2320/jinstmet1952.46.2_176" @default.
- W2605394193 hasPublicationYear "1982" @default.
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