Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1484474 | Journal of Non-Crystalline Solids | 2008 | 5 Pages |
Abstract
Interactions in the La1âxNdxNi3.5Al1.5-Ð2 (x = 0.1 and 0.2) system was studied from room temperature up to 950 °C at the initial hydrogen pressure of 5 MPa through differential thermal (DTA) and X-ray phase analyses. Heating two-phase alloys (x = 0.1 and 0.2) in hydrogen results in their disproportionation (at 530 and 560 °С, respectively) and the formation of NiAl and unidentified amorphous products. The single-phase La0.9Nd0.1Ni3.5Al1.5 alloy decomposes in hydrogen at 900 °С into a hydride of rare-earth metals and an Ni3Al intermetallic; traces of NiAl and hydride of a phase of the CaCu5-type structure have also been observed. Heating the disproportionated samples in vacuum to 520-550 °С leads to their recombination into a homogenized phase with a CaCu5-type structure. In other words, the increase of neodymium content shifts the reaction equilibrium of La1âxNdxNi3.5Al1.5 alloys with hydrogen towards recombination.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Ð.Ð. Trostianchyn, Ð.Ð. Bulyk, I.V. Trostianchyn, S.I. Mudry,