Interfacial segregation, pore formation and scale adhesion on NiAlalloys

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Alloys of commercial grades that do not contain a reactive element, such as yttrium, often develop pores at the scale/alloy interface. The accumulation and growth of these pores greatly weaken scale adhesion. The purpose of this study is to evaluate pore development in Fe-40at%Al and determine the change in pore volume with oxidation time. Experimental results are then compared to a theoretical calculation where all vacancies are allowed to condense as voids. After removing the oxide scales that formed after various times of oxidation at 1000 C in oxygen, the alloy surface was analyzed using scanning electron microscopy (SEM) and ... continued below

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Hou, Peggy Y. & Priimak, K. October 9, 2001.

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Description

Alloys of commercial grades that do not contain a reactive element, such as yttrium, often develop pores at the scale/alloy interface. The accumulation and growth of these pores greatly weaken scale adhesion. The purpose of this study is to evaluate pore development in Fe-40at%Al and determine the change in pore volume with oxidation time. Experimental results are then compared to a theoretical calculation where all vacancies are allowed to condense as voids. After removing the oxide scales that formed after various times of oxidation at 1000 C in oxygen, the alloy surface was analyzed using scanning electron microscopy (SEM) and atomic force microscopy (AFM) to determine the size and depth of interfacial pores. Results are discussed in light of possible mechanisms involved in pore formation at scale/alloy interfaces.

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  • Journal Name: Oxidation of Metals; Journal Volume: 63; Related Information: Journal Publication Date: 2005

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  • Report No.: LBNL--55446
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 886826
  • Archival Resource Key: ark:/67531/metadc876059

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  • October 9, 2001

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 30, 2016, 1:54 p.m.

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Hou, Peggy Y. & Priimak, K. Interfacial segregation, pore formation and scale adhesion on NiAlalloys, article, October 9, 2001; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc876059/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.