Long-term stability of 14YT-4Sc alloy at high temperature

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

8 Scopus Citations
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Author(s)

  • Lulu Li
  • Weizong Xu
  • Mostafa Saber
  • Carl C. Koch
  • Ronald O. Scattergood

Detail(s)

Original languageEnglish
Pages (from-to)222-228
Journal / PublicationMaterials Science and Engineering A
Volume647
Online published8 Sep 2015
Publication statusPublished - 28 Oct 2015
Externally publishedYes

Abstract

14YT alloy (Fe-14Cr-0.25wt%Y2O3-0.4wt%Ti) with 4at% Sc addition was previously reported to exhibit a nanoscale microstructure and high strength when annealed at temperatures up to 1000°C (0.65Tm) for 1h. Here we report that the microstructure and mechanical behavior of 14YT-4Sc alloy after long-term annealing for up to 60h 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 (< 10 nm) were observed in EDS mapping of the 14YT-4Sc-60h sample. The nano-structure retention at the high temperature of 1000°C for 60h is attributed to these complex nano oxides.

Research Area(s)

  • Grain growth, Long-term stability, Nanocrystalline ODS ferritic alloys, Sc stabilization

Citation Format(s)

Long-term stability of 14YT-4Sc alloy at high temperature. / Li, Lulu; Xu, Weizong; Saber, Mostafa; Zhu, Yuntian; Koch, Carl C.; Scattergood, Ronald O.

In: Materials Science and Engineering A, Vol. 647, 28.10.2015, p. 222-228.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal