Design of an Eta-Phase Precipitation-Hardenable Nickel-Based Alloy with the Potential for Improved Creep Strength Above 1023?K (750?°C)
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  • 作者:Matthew J. Wong ; Paul G. Sanders
  • 刊名:Metallurgical and Materials Transactions A
  • 出版年:2015
  • 出版时间:July 2015
  • 年:2015
  • 卷:46
  • 期:7
  • 页码:2947-2955
  • 全文大小:1,897 KB
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  • 作者单位:Matthew J. Wong (1)
    Paul G. Sanders (1)
    John P. Shingledecker (2)
    Calvin L. White (1)

    1. Department of Materials Science & Engineering, Michigan University, 1400 Townsend Dr., Houghton, MI, 49931, M&M Building 512, Houghton, MI, USA
    2. Electric Power Research Institute, Charlotte, NC, USA
  • 刊物类别:Chemistry and Materials Science
  • 刊物主题:Chemistry
    Materials Science
    Metallic Materials
    Structural Materials
    Physical Chemistry
    Ceramics,Glass,Composites,Natural Materials
  • 出版者:Springer Boston
  • ISSN:1543-1940
文摘
In a number of nickel-based superalloy systems strengthened by gamma prime (γ-, eta-phase (Ni3Ti, η) forms during prolonged high-temperature exposure, but its effect on mechanical properties is not well characterized. Using thermodynamic modeling and design-of-experiments techniques, three modifications of the nickel-based superalloy Nimonic (Nimonic? is a trademark of Special Metals Corporation group of companies.) 263 were identified that yield increased volume fractions of the eta-phase (Ni3Ti, η) at temperatures above 1023?K (750?°C). Volume fractions of η-phase were evaluated for each alloy and heat-treatment condition using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Compared to Nimonic 263, small additions of V and Ta were found to increase the volume fraction of η-phase above 1023?K (750?°C) from approximately 5?pct to above 15?pct, thus providing a route for future mechanical behavior experimental studies, which was not in the scope of this work.

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