Atomic interactions and hydrogen-induced γ* phase in fcc iron-nickel alloys

✍ Scribed by Movchan, D. N. ;Shyvanyuk, V. N. ;Shanina, B. D. ;Gavriljuk, V. G.

• Book ID: 105365617
• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 377 KB
• Volume: 207
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200925548

✦ Synopsis

Abstract

Energy of metal–metal (Me–Me) and metal–hydrogen (Me–H) bonds in hydrogen‐free and hydrogen‐charged fcc iron, nickel, and iron–nickel alloys are ab initio calculated. It is shown that short‐range decomposition of Fe–Ni solid solution and difference in Fe–H and Ni–H bonds are responsible for splitting of γ reflections in the X‐ray diffraction patterns, which is at variance with the common interpretation in terms of a hydrogen‐caused γ* phase. X‐ray diffraction measurements confirm the absence of miscibility gap in the FeNi–H solid solution and its occurrence in Ni–H. Results of calculations are consistent with the absence of H–H pairs in pure nickel.