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Title: Sintering behavior of Lanthana-bearing nanostructured ferritic steel consolidated via spark plasma sintering

Elemental powder mixture of Fe–14Cr–1Ti–0.3Mo–0.5La2O3 (wt%) composition is mechanically alloyed for different milling durations (5, 10 and 20 h) and subsequently consolidated via spark plasma sintering under vacuum at 950 °C for 7 min. The effects of milling time on the densification behavior and density/microhardness are studied. The sintering activation energy is found to be close to that of grain boundary diffusion. The bimodal grain structure created in the milled and sintered material is found to be a result of milling and not of sintering alone. The oxide particle diameter varies between 2 and 70 nm. As a result, faceted precipitates smaller than 10 nm in diameter are found to be mostly La–Ti–Cr-enriched complex oxides that restrict further recrystallization and related phenomena.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2]
  1. Univ. of Idaho, Moscow, ID (United States); Center for Advanced Energy Studies (CAES), Idaho Falls, ID (United States)
  2. Boise State Univ., Boise, ID (United States); Center for Advanced Energy Studies (CAES), Idaho Falls, ID (United States)
Publication Date:
OSTI Identifier:
1294356
Report Number(s):
INL/JOU--13-30950
Journal ID: ISSN 1438-1656
Grant/Contract Number:
AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
Advanced Engineering Materials
Additional Journal Information:
Journal Volume: 18; Journal Issue: 2; Journal ID: ISSN 1438-1656
Publisher:
Wiley
Research Org:
Idaho National Laboratory, Idaho Falls, ID (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS mechanical alloying; spark plasma sintering; heterogeneous microstructure; nanostructured ferritic steel; lanthanum oxide