Characterization of internal oxidation and permeability of oxygen in Pd/Al alloys using hydrogen isotherms

Journal Article · Fri Mar 15 04:00:00 EST 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(95)00614-1· OSTI ID:215360

Noh, H; Flanagan, T B ^[1]; Balasubramaniam, R ^[2]; Eastman, J A ^[3]

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1. Univ. of Vermont, Burlington, VT (United States)
2. Indian Inst. of Technology, Kanpur (India). Dept. of Materials and Metallurgical Engineering
3. Argonne National Lab., IL (United States). Materials Science Div.

Eastman and Ruehle have shown that substitutional fcc Pd-Al alloys can be internally oxidized to produce Al{sub 2}O{sub 3} precipitates within a metal matrix. Emphasis in this study will be characterizing of internally oxidized alloys using hydrogen at contents r > 0.01; these are easily accessible by gas phase measurements which will be carried out to p{sub H{sub 2}} {le} 5 bar. The hydrogen isotherms of palladium and a Pd{sub 0.97}Al{sub 0.03} alloy both exhibit plateau pressure regions where a dilute and hydride phase co-exist. If complete internal oxidation takes place, it is expected that the isotherm for the Pd{sub 0.97}Al{sub 0.03} alloy will change to that for pure Pd. Partial oxidation should lead to two plateau pressures, one characteristic of the alloy and one of pure Pd and their relative breadths will be proportional to the fractions of each.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 215360
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 6 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
DIFFUSION
HYDRIDES
HYDROGEN
INTERFACES
MEDIUM PRESSURE
MICROSTRUCTURE
PALLADIUM ALLOYS
PERMEABILITY
PRECIPITATION