The development of a ductility-based aging model for low temperature aged U-6Nb alloy

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This study focuses on the ductility evaluation of low-temperature (100 and 200 C) aged U-6Nb alloy. The objective is to develop a ductility-based aging model to improve lifetime prediction for weapon components in the stockpile environment. Literature review shows that the work hardening n-value and the strain-rate hardening mvalue are the two most important metallurgical factors for the uniform and the post-uniform (necking) ductility control, respectively. Unfortunately, both n and m values of the U-6Nb alloy are lacking. The study shows that the total ductility of U-6Nb is dominated by the uniform ductility, which deteriorates in both 100 C and ... continued below

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Bridges, B March 24, 2005.

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This study focuses on the ductility evaluation of low-temperature (100 and 200 C) aged U-6Nb alloy. The objective is to develop a ductility-based aging model to improve lifetime prediction for weapon components in the stockpile environment. Literature review shows that the work hardening n-value and the strain-rate hardening mvalue are the two most important metallurgical factors for the uniform and the post-uniform (necking) ductility control, respectively. Unfortunately, both n and m values of the U-6Nb alloy are lacking. The study shows that the total ductility of U-6Nb is dominated by the uniform ductility, which deteriorates in both 100 C and 200 C aging. Further analysis shows that the uniform ductility correlates well with the work hardening n-value of the later stage deformation in which dislocation-slip is the mechanism. The kinetics of the loss of uniform ductility and the associated reduction in work-hardening n-value in low temperature aging will be used for the development of a ductility-based aging model. The necking ductility appears to be a minor but significant factor in the total ductility of U-6Nb. It does not show a clear trend due to large data scatter. The uncertain nature of necking failure may always hinder a reliable measurement of necking ductility. Consequently, a precise measurement of strain-rate hardening m-value could be a viable alternative to model the metallurgical contribution to the necking ductility. The conventional strain rate step-change method and the ABI (Automated-Ball-Indentation) test both show promising result in m-value measurement.

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PDF-file: 7 pages; size: 0.5 Mbytes

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  • Presented at: The 26th Compatibility, Aging, and Stockpile Stewardship Conference, Aiken, SC, United States, Apr 26 - Apr 28, 2005

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  • Report No.: UCRL-CONF-211065
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 918415
  • Archival Resource Key: ark:/67531/metadc888186

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  • March 24, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 23, 2016, 3:25 p.m.

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Bridges, B. The development of a ductility-based aging model for low temperature aged U-6Nb alloy, article, March 24, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc888186/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.