Stability of Y–Ti–O precipitates in friction stir welded nanostructured ferritic alloys

X. Yu; B. Mazumder; M. K. Miller; S. A. David; Z. Feng

doi:10.1179/1362171815Y.0000000002

Stability of Y–Ti–O precipitates in friction stir welded nanostructured ferritic alloys

X. Yu, B. Mazumder, M. K. Miller, S. A. David, Z. Feng

Materials Joining

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14 Scopus citations

Abstract

Nanostructured ferritic alloys, which have complex microstructures consisting of ultrafine ferritic grains with a dispersion of stable oxide particles and nanoclusters, are promising materials for fuel cladding and structural applications in the next generation nuclear reactor. This study evaluates microstructure of friction stir welded nanostructured ferritic alloys using electron microscopy and atom probe tomography techniques. Atom probe tomography results revealed that nanoclusters are coarsened and inhomogeneously distributed in the stir zone and thermomechanically affected zone. Three hypotheses on coarsening of nanoclusters are presented. The hardness difference in different regions of friction stir weld has been explained.

Original language	English
Pages (from-to)	236-241
Number of pages	6
Journal	Science and Technology of Welding and Joining
Volume	20
Issue number	3
DOIs	https://doi.org/10.1179/1362171815Y.0000000002
State	Published - Mar 1 2015

Keywords

Atom probe tomography
Friction stir weld
Nanostructured ferritic alloys
Oxide dispersion strengthened alloys

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title = "Stability of Y–Ti–O precipitates in friction stir welded nanostructured ferritic alloys",

abstract = "Nanostructured ferritic alloys, which have complex microstructures consisting of ultrafine ferritic grains with a dispersion of stable oxide particles and nanoclusters, are promising materials for fuel cladding and structural applications in the next generation nuclear reactor. This study evaluates microstructure of friction stir welded nanostructured ferritic alloys using electron microscopy and atom probe tomography techniques. Atom probe tomography results revealed that nanoclusters are coarsened and inhomogeneously distributed in the stir zone and thermomechanically affected zone. Three hypotheses on coarsening of nanoclusters are presented. The hardness difference in different regions of friction stir weld has been explained.",

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T1 - Stability of Y–Ti–O precipitates in friction stir welded nanostructured ferritic alloys

AU - Yu, X.

AU - Mazumder, B.

AU - Miller, M. K.

AU - David, S. A.

AU - Feng, Z.

PY - 2015/3/1

Y1 - 2015/3/1

N2 - Nanostructured ferritic alloys, which have complex microstructures consisting of ultrafine ferritic grains with a dispersion of stable oxide particles and nanoclusters, are promising materials for fuel cladding and structural applications in the next generation nuclear reactor. This study evaluates microstructure of friction stir welded nanostructured ferritic alloys using electron microscopy and atom probe tomography techniques. Atom probe tomography results revealed that nanoclusters are coarsened and inhomogeneously distributed in the stir zone and thermomechanically affected zone. Three hypotheses on coarsening of nanoclusters are presented. The hardness difference in different regions of friction stir weld has been explained.

AB - Nanostructured ferritic alloys, which have complex microstructures consisting of ultrafine ferritic grains with a dispersion of stable oxide particles and nanoclusters, are promising materials for fuel cladding and structural applications in the next generation nuclear reactor. This study evaluates microstructure of friction stir welded nanostructured ferritic alloys using electron microscopy and atom probe tomography techniques. Atom probe tomography results revealed that nanoclusters are coarsened and inhomogeneously distributed in the stir zone and thermomechanically affected zone. Three hypotheses on coarsening of nanoclusters are presented. The hardness difference in different regions of friction stir weld has been explained.

KW - Atom probe tomography

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Stability of Y–Ti–O precipitates in friction stir welded nanostructured ferritic alloys

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