Superabundant vacancies and enhanced diffusion in Pd-Rh alloys under high hydrogen pressures

Journal Article · Thu Feb 15 00:00:00 EST 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(95)00491-2· OSTI ID:194932

Watanabe, K; Okuma, N; Fukai, Y ^[1]; Sakamoto, Y ^[2]; Hayashi, Y ^[3]

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1. Chuo Univ., Tokyo (Japan). Dept. of Physics
2. Nagasaki Univ. (Japan). Dept. of Materials Science and Engineering
3. Kyushu Univ., Fukuoka (Japan). Dept. of Materials Science

In the authors` recent experiments on a number of metal-hydrogen systems, they discovered that the equilibrium concentration of metal-atom vacancies is greatly enhanced under high hydrogen pressures. They suggested that this phenomenon of superabundant vacancy formation should be the cause of the hydrogen-induced migration of metal atoms reported for some Pd alloys. The purpose of this paper is to provide detailed structural information on the formation of superabundant vacancies and its effects on the phase separation process in Pd{sub 0.8}Rh{sub 0.2} alloys by performing in situ X-ray diffraction at high temperatures and high hydrogen pressures.

• OSTI ID: 194932
• Journal Information: Scripta Materialia, Vol. 34, Issue 4; Other Information: PBD: 15 Feb 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PALLADIUM ALLOYS
VACANCIES
SELF-DIFFUSION
RHODIUM ALLOYS
HYDROGEN
METALLURGICAL EFFECTS
SAMPLE PREPARATION
MELTING
ANNEALING
X-RAY DIFFRACTION
PHASE STUDIES
PRESSURE DEPENDENCE