Original title: Modification of transmissivity of hydrogen through the surface of Ni3Al by alloying
Authors: Čermák, Jiří ; Rothová, Věra
Document type: Papers
Conference/Event: Metal 01, Ostrava (CZ), 2001-05-15 / 2001-05-17
Year: 2001
Language: eng
Abstract: Hydrogen invasion into Ni3Al-M was studied by gas-permeation method in temperature range 573 - 1 223 K. The dependence of hydrogen permeation flux J(d) through the membrane-like samples on the samples thickness d enabled us to assess the influence of the surface upon the rate of permeation. The surface transmissivity was introduced as a quantitative characteristic describing the rate of the process. Influence of three modifying elements M = Fe, Cr and Zr was studied. It was found that Zr supports and, on the contrary, Cr eliminates the inhibiting effect of the surface. The iron did not alter significantly the hydrogen transmissivity, and it causes enhanced grain boundary brittleness in hydrogen environment.
Keywords: hydrogen; permeation; surface
Project no.: CEZ:AV0Z2041904 (CEP), IBS2041105 (CEP), GA106/99/1179 (CEP)
Funding provider: GA AV ČR, GA ČR
Host item entry: Metal 01

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0074679

Permalink: http://www.nusl.cz/ntk/nusl-26498


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Research > Institutes ASCR > Institute of Physics of Materials
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