Spinodal Decomposition and Ordering Transformation in U-6 wt% Nb

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Phase stability and aging mechanisms in a water-quenched (WQ) U-6wt% Nb (WQ-U6Nb) alloy artificially aged at 200 C (16 hours) and naturally aged at room temperature for 15 years have been investigated. Age hardening/softening phenomenon is recorded from the artificially aged samples by microhardness measurement. The age hardening can be readily rationalized by the occurrence of spinodal decomposition (or fine-scaled Nb segregation), which results in the formation of a modulated structure in the aged samples. Prolonged aging leads to age softening of the alloy by coarsening of the modulated structure. Disorder-order or chemical ordering transformation is found within the naturally ... continued below

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Hsiung, L M August 15, 2005.

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Phase stability and aging mechanisms in a water-quenched (WQ) U-6wt% Nb (WQ-U6Nb) alloy artificially aged at 200 C (16 hours) and naturally aged at room temperature for 15 years have been investigated. Age hardening/softening phenomenon is recorded from the artificially aged samples by microhardness measurement. The age hardening can be readily rationalized by the occurrence of spinodal decomposition (or fine-scaled Nb segregation), which results in the formation of a modulated structure in the aged samples. Prolonged aging leads to age softening of the alloy by coarsening of the modulated structure. Disorder-order or chemical ordering transformation is found within the naturally aged alloy according to TEM observations of antiphase domain boundaries (APBs) and superlattice diffraction patterns. The formation of a partially ordered phase in the naturally aged alloy is proposed and identified.

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PDF-file: 10 pages; size: 0.7 Mbytes

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  • Presented at: Solid? Solid Phase Transformations in Inorganic Materials 2005, Phoenix, AZ, United States, May 29 - Jun 03, 2005

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  • Report No.: UCRL-PROC-214640
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 878608
  • Archival Resource Key: ark:/67531/metadc873819

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 15, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 9:35 p.m.

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Hsiung, L M. Spinodal Decomposition and Ordering Transformation in U-6 wt% Nb, article, August 15, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc873819/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.