Journal
MATERIALIA
Volume 4, Issue -, Pages 65-69Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtla.2018.08.030
Keywords
Creep; Al-Yb-Er-Sc-Zr alloy; Atom-probe tomography; Strengthening; High-temperature alloy
Categories
Funding
- Army Research Laboratory [W911NF-10-20098]
- NSF-MRI program [DMR-0420532]
- ONR-DURIP program [N00014-0400798, N00014-0610539, N00014-0910781, N00014-1712870]
- MRSEC program at the Materials Research Center [NSF DMR-1720139]
- SHyNE Resource [NSF ECCS1542205]
- Initiative for Sustainability and Energy (ISEN) at Northwestern University
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A dilute Al-0.02Yb-0.01Er-0.03Sc-0.03Zr (at.%) alloy was aged to create a high number density of Al-3 (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 degrees 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 Al-3 (Sc,Zr) and Al-3 (Sc,Zr,Er) nanoprecipitates. This improvement is consistent with Yb/Er enrichment within the nanoprecipitates, increasing their lattice mismatch with the matrix.
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