Institute of Physics of Materials AS CR, v. v. i. > Projects > Diffusion of hydrogen in alloys Mg-Ni modified by chosen elements that suppress the stability of hydrides

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Diffusion of hydrogen in alloys Mg-Ni modified by chosen elements that suppress the stability of hydrides

Anotace

The aim of the project is (i) to obtain the diffusion coefficients of hydrogen in Mg, Mg-xNi and Mg-xNi-yX alloys with the third element X that shows no significant tendency to hydride formation and (ii) to measure the hydrogen desorption spectras of modified (Mg-xNi-yX)-H alloys by DSC. The alloys will be prepared by ball milling and following pressure compacting and by ball-milling followed by induction melting. Average Ni concentration will be x = 10, 23.5 (eutectic), 40, 54.5 (Mg2Ni) and 60 wt.%. Alloying elements X will be chosen from group II.-IV. (X: Zn, Ga, In, Si, Ge and Sn) and their concentration y will be in units of weight percent. Characteristics of the samples will be checked by electron microanalysis using SEM/EDAX and by DSC. Experimental temperatures will span from the room temperature up to the solidus. Diffusion coefficients will be obtained by tenzimetric method: The samples will be hydrogenised by gaseous hydrogen in a furnace. Diffusion coefficients will be calculated from time dependence of pressure of hydrogen released from the samples.