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Long-Term Stability of 14YT-4Sc Alloy at High Temperature
Mechanical and Materials Engineering Faculty Publications and Presentations
  • Lulu Li, North Carolina State University at Raleigh
  • Weizong Xu, North Carolina State University at Raleigh
  • Mostafa Saber, Portland State University
  • Yuntian Zhu, North Carolina State University at Raleigh
  • Carl C. Koch, North Carolina State University at Raleigh
  • Ronald O. Scattergood, North Carolina State University at Raleigh
Document Type
Publication Date
  • Stability mechanics,
  • Alloys -- Effect of high temperature on,
  • Nanocrystals,
  • Ferromagnetic materials
14YT alloy (Fe-14Cr-0.25wt.%Y2O3-0.4wt.%Ti) with 4 at.% Sc addition was previously reported to exhibit a nanoscale microstructure and high strength when annealed at temperatures up to 1000 °C (0.65Tm) for 1 hour. Here we report that the microstructure and mechanical behavior of 14YT-4Sc alloy after long-term annealing for up to 60 hours at 1000 °C. FIB analysis shows abnormal grain growth with annealing time, while a large fraction of the matrix still consists of nanoscale grains. TEM images reveal a slight growth of nano grains, with estimated grain growth exponent, n, to be 0.29. Sc-Ti-Y-O enriched nano oxide particles (nm) were observed in EDS mapping of the 14YT-4Sc-60h sample. The nano-structure retention at the high temperature of 1000 °C for 60 hours is attributed to these complex nano oxides.

This is the authors accepted manuscript reproduced here with permission. The definitive version copyright 2015 Elsevier is available at the publisher site.

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Citation Information
Lulu Li, Weizong Xu, Mostafa Saber, Yuntian Zhu, Carl C. Koch and Ronald O. Scattergood, Long-term stability of 14YT-4Sc alloy at High temperature, Materials Science & Engineering A