Effect of Yb microadditions on creep resistance of a dilute Al-Er-Sc-Zr alloy

Nhon Q. Vo*, Davaadorj Bayansan, Amirreza Sanaty-Zadeh, Evander H. Ramos, David C. Dunand

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

A dilute Al-0.02Yb-0.01Er-0.03Sc-0.03Zr (at.%) alloy was aged to create a high number density of Al3(Sc0.56Yb0.14Er0.10Zr0.20) nanoprecipitates, with 3.5 nm radius, an Yb- and Er-enriched core and Sc- and Zr-enriched shells, as measured via atom-probe tomography. At 400 °C, the alloy exhibits a 17 MPa threshold stress, 2–3 times higher than previously-studied, Sc-richer Al-0.06Sc-0.06Zr and Al-0.01Er-0.05Sc-0.06Zr (at.%) alloys with Al3(Sc,Zr) and Al3(Sc,Zr,Er) nanoprecipitates. This improvement is consistent with Yb/Er enrichment within the nanoprecipitates, increasing their lattice mismatch with the matrix.

Original languageEnglish (US)
Pages (from-to)65-69
Number of pages5
JournalMaterialia
Volume4
DOIs
StatePublished - Dec 2018

Keywords

  • Al-Yb-Er-Sc-Zr alloy
  • Atom-probe tomography
  • Creep
  • High-temperature alloy
  • Strengthening

ASJC Scopus subject areas

  • General Materials Science

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