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

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 M...

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Bibliographic Details
Published inMaterialia Vol. 4; pp. 65 - 69
Main Authors Vo, Nhon Q., Bayansan, Davaadorj, Sanaty-Zadeh, Amirreza, Ramos, Evander H., Dunand, David C.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2018
Subjects
Al-Yb-Er-Sc-Zr alloy
Atom-probe tomography
Creep
High-temperature alloy
Strengthening
Strengthening
High-temperature alloy
Creep
Al-Yb-Er-Sc-Zr alloy
Atom-probe tomography
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Summary: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. [Display omitted]
ISSN:2589-1529
2589-1529
DOI:10.1016/j.mtla.2018.08.030