HRTEM Study of the Role of Nanoparticles in ODS Ferritic Steel

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Structures of nanoparticles and their role in dual-ion irradiated Fe-16Cr-4.5Al-0.3Ti-2W-0.37Y{sub 2}O{sub 3} (K3) ODS ferritic steel produced by mechanical alloying (MA) were studied using high-resolution transmission electron microscopy (HRTEM) techniques. The observation of Y{sub 4}Al{sub 2}O{sub 9} complex-oxide nanoparticles in the ODS steel imply that decomposition of Y{sub 2}O{sub 3} in association with internal oxidation of Al occurred during mechanical alloying. HRTEM observations of crystalline and partially crystalline nanoparticles larger than {approx}2 nm and amorphous cluster-domains smaller than {approx}2 nm provide an insight into the formation mechanism of nanoparticles/clusters in MA/ODS steels, which we believe involves solid-state amorphization and re-crystallization. ... continued below

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Hsiung, L; Tumey, S; Fluss, M; Serruys, Y & Willaime, F August 30, 2011.

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Structures of nanoparticles and their role in dual-ion irradiated Fe-16Cr-4.5Al-0.3Ti-2W-0.37Y{sub 2}O{sub 3} (K3) ODS ferritic steel produced by mechanical alloying (MA) were studied using high-resolution transmission electron microscopy (HRTEM) techniques. The observation of Y{sub 4}Al{sub 2}O{sub 9} complex-oxide nanoparticles in the ODS steel imply that decomposition of Y{sub 2}O{sub 3} in association with internal oxidation of Al occurred during mechanical alloying. HRTEM observations of crystalline and partially crystalline nanoparticles larger than {approx}2 nm and amorphous cluster-domains smaller than {approx}2 nm provide an insight into the formation mechanism of nanoparticles/clusters in MA/ODS steels, which we believe involves solid-state amorphization and re-crystallization. The role of nanoparticles/clusters in suppressing radiation-induced swelling is revealed through TEM examinations of cavity distributions in (Fe + He) dual-ion irradiated K3-ODS steel. HRTEM observations of helium-filled cavities (helium bubbles) preferably trapped at nanoparticle/clusters in dual-ion irradiated K3-ODS are presented.

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PDF-file: 14 pages; size: 1.3 Mbytes

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  • Presented at: 2010 MRS Fall Meeting, Boston, MA, United States, Nov 28 - Dec 03, 2010

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  • Report No.: LLNL-PROC-497352
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1026918
  • Archival Resource Key: ark:/67531/metadc834289

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  • August 30, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 8, 2016, 8:14 p.m.

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Hsiung, L; Tumey, S; Fluss, M; Serruys, Y & Willaime, F. HRTEM Study of the Role of Nanoparticles in ODS Ferritic Steel, article, August 30, 2011; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc834289/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.