Effect of mechanical milling on the microstructure and hydrogen interaction of both Mm-Ni and MmNi5-Ni mixtures

M.R. ESQUIVEL; G. MEYER

MATERIALS SCIENCE FORUM

Trans Tech Publications

Lugar: Berna; Año: 2008 vol. 570 p. 72 - 78

0255-5476

Mechanical milling (MM) and a combination of MM and temperature heating were used to synthesize the intermetallic MmNi5 and a MmNi5-Ni mixture, respectively. The process evolution with time was analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). SEM was used to characterize size and morphology of particles in order to reveal the governing mechanisms during the milling of each system. X-ray diffraction (XRD) was utilized to determine strain and crystallite size changes introduced by milling. The effects of integrated milling time on the sorption properties of the MmNi5-Ni mixture were analyzed. Results were correlated to defects introduced into microstructure.  A comparison of the final characteristics of alloys obtained in each case is also shown.