Segregation phenomena at growing alumina/alloy interfaces

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The chemistry and structure at the scale/alloy interface are important factors governing scale adhesion. The chemical changes can occur from segregation of impurities in the alloy, such as sulphur and carbon, or alloying elements such as chromium, aluminium and reactive elements. This paper reviews studies of the changes of interfacial composition with oxidation time for Al{sub 2}O{sub 3} formed on several model alumina-forming alloys, and tries to relate that to the interfacial strength. Results show that sulphur segregation to oxide/metal interfaces can indeed occur, but the type and amount of segregants at the interface depend on the alloy composition and ... continued below

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Hou, Peggy Y. March 30, 2005.

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The chemistry and structure at the scale/alloy interface are important factors governing scale adhesion. The chemical changes can occur from segregation of impurities in the alloy, such as sulphur and carbon, or alloying elements such as chromium, aluminium and reactive elements. This paper reviews studies of the changes of interfacial composition with oxidation time for Al{sub 2}O{sub 3} formed on several model alumina-forming alloys, and tries to relate that to the interfacial strength. Results show that sulphur segregation to oxide/metal interfaces can indeed occur, but the type and amount of segregants at the interface depend on the alloy composition and the interface structure. Co-segregation of impurities with alloying elements can also occur, resulting in multi-layer segregants at the interface. Sulphur-containing interfaces are indeed weaker, but the major role of sulphur is to enhance interfacial void formation. Reactive elements in the alloy not only gather sulfur but also exert an additional positive effect on scale adhesion.

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  • Sym. Corrosion Science in the 21st Century,Manchester, UK, July 6-11, 2003

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  • Report No.: LBNL--52959
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 881828
  • Archival Resource Key: ark:/67531/metadc886295

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  • March 30, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 29, 2016, 6:58 p.m.

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Hou, Peggy Y. Segregation phenomena at growing alumina/alloy interfaces, article, March 30, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc886295/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.