Effects of Nb and Ta additions on the strength and coarsening resistance of precipitation-strengthened Al-Zr-Sc-Er-Si alloys

Dinc Erdeniz*, Anthony De Luca, David N Seidman, David C Dunand

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A dilute Al-0.07Zr-0.02Sc-0.005Er-0.06Si (at.%) alloy was microalloyed with 0.08 at.% Nb or Ta. Atom-probe tomography reveals that, upon aging, Nb and Ta partition to the coherent L12-Al3(Zr,Sc,Er) nanoprecipitates (with average concentrations of 0.2 and 0.08 at.%, respectively), with both segregating at the matrix/nanoprecipitate heterophase interface. This is consistent with the Nb- and Ta-modified alloys exhibiting, as compared to the unmodified alloy: (i) higher peak microhardness, from a higher nanoprecipitate volume fraction and/or lattice parameter mismatch; and (ii) improved aging resistance, from slower nanoprecipitate coarsening due to the small diffusivities of niobium and tantalum in aluminum. Analogous results were previously reported for a V-modified alloy.

Original languageEnglish (US)
Pages (from-to)260-266
Number of pages7
JournalMaterials Characterization
Volume141
DOIs
StatePublished - Jul 1 2018

Fingerprint

Coarsening
Aging of materials
Niobium
Tantalum
tantalum
Aluminum
niobium
Microhardness
microhardness
Lattice constants
diffusivity
Tomography
partitions
lattice parameters
Volume fraction
tomography
aluminum
Atoms
probes
matrices

Keywords

  • Aluminum alloys
  • Atom-probe tomography
  • Coarsening
  • Microhardness
  • Precipitation strengthening

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

@article{26b3bf09de7746f2b13ef1c0f7ad6a46,
title = "Effects of Nb and Ta additions on the strength and coarsening resistance of precipitation-strengthened Al-Zr-Sc-Er-Si alloys",
abstract = "A dilute Al-0.07Zr-0.02Sc-0.005Er-0.06Si (at.{\%}) alloy was microalloyed with 0.08 at.{\%} Nb or Ta. Atom-probe tomography reveals that, upon aging, Nb and Ta partition to the coherent L12-Al3(Zr,Sc,Er) nanoprecipitates (with average concentrations of 0.2 and 0.08 at.{\%}, respectively), with both segregating at the matrix/nanoprecipitate heterophase interface. This is consistent with the Nb- and Ta-modified alloys exhibiting, as compared to the unmodified alloy: (i) higher peak microhardness, from a higher nanoprecipitate volume fraction and/or lattice parameter mismatch; and (ii) improved aging resistance, from slower nanoprecipitate coarsening due to the small diffusivities of niobium and tantalum in aluminum. Analogous results were previously reported for a V-modified alloy.",
keywords = "Aluminum alloys, Atom-probe tomography, Coarsening, Microhardness, Precipitation strengthening",
author = "Dinc Erdeniz and {De Luca}, Anthony and Seidman, {David N} and Dunand, {David C}",
year = "2018",
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language = "English (US)",
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journal = "Materials Characterization",
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Effects of Nb and Ta additions on the strength and coarsening resistance of precipitation-strengthened Al-Zr-Sc-Er-Si alloys. / Erdeniz, Dinc; De Luca, Anthony; Seidman, David N; Dunand, David C.

In: Materials Characterization, Vol. 141, 01.07.2018, p. 260-266.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effects of Nb and Ta additions on the strength and coarsening resistance of precipitation-strengthened Al-Zr-Sc-Er-Si alloys

AU - Erdeniz, Dinc

AU - De Luca, Anthony

AU - Seidman, David N

AU - Dunand, David C

PY - 2018/7/1

Y1 - 2018/7/1

N2 - A dilute Al-0.07Zr-0.02Sc-0.005Er-0.06Si (at.%) alloy was microalloyed with 0.08 at.% Nb or Ta. Atom-probe tomography reveals that, upon aging, Nb and Ta partition to the coherent L12-Al3(Zr,Sc,Er) nanoprecipitates (with average concentrations of 0.2 and 0.08 at.%, respectively), with both segregating at the matrix/nanoprecipitate heterophase interface. This is consistent with the Nb- and Ta-modified alloys exhibiting, as compared to the unmodified alloy: (i) higher peak microhardness, from a higher nanoprecipitate volume fraction and/or lattice parameter mismatch; and (ii) improved aging resistance, from slower nanoprecipitate coarsening due to the small diffusivities of niobium and tantalum in aluminum. Analogous results were previously reported for a V-modified alloy.

AB - A dilute Al-0.07Zr-0.02Sc-0.005Er-0.06Si (at.%) alloy was microalloyed with 0.08 at.% Nb or Ta. Atom-probe tomography reveals that, upon aging, Nb and Ta partition to the coherent L12-Al3(Zr,Sc,Er) nanoprecipitates (with average concentrations of 0.2 and 0.08 at.%, respectively), with both segregating at the matrix/nanoprecipitate heterophase interface. This is consistent with the Nb- and Ta-modified alloys exhibiting, as compared to the unmodified alloy: (i) higher peak microhardness, from a higher nanoprecipitate volume fraction and/or lattice parameter mismatch; and (ii) improved aging resistance, from slower nanoprecipitate coarsening due to the small diffusivities of niobium and tantalum in aluminum. Analogous results were previously reported for a V-modified alloy.

KW - Aluminum alloys

KW - Atom-probe tomography

KW - Coarsening

KW - Microhardness

KW - Precipitation strengthening

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