Strengthening mechanisms in aluminum containing coherent Al3Sc precipitates and incoherent Al2O3 dispersoids

Richard A. Karnesky; Liang Meng; David C. Dunand

doi:10.1016/j.actamat.2006.10.004

Strengthening mechanisms in aluminum containing coherent Al₃Sc precipitates and incoherent Al₂O₃ dispersoids

Richard A. Karnesky, Liang Meng, David C. Dunand^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

84 Scopus citations

Abstract

Dispersion-strengthened-cast aluminum (DSC-Al), consisting of a coarse-grained aluminum matrix containing two populations of particles (30 vol.% of 300 nm Al₂O₃ incoherent dispersoids and 0.2-0.3 vol.% of 6-60 nm coherent Al₃Sc precipitates), was studied. At ambient and elevated temperatures, both populations of particles contribute to strengthening. At 300 °C, creep threshold stresses are considerably higher than for control materials with a single population of either Al₂O₃ dispersoids or Al₃Sc precipitates. This synergistic effect is modeled by considering dislocations pinned at the departure side of incoherent Al₂O₃ dispersoids (detachment model) and simultaneously subjected to elastic interactions from neighboring coherent Al₃Sc precipitates.

Original language	English (US)
Pages (from-to)	1299-1308
Number of pages	10
Journal	Acta Materialia
Volume	55
Issue number	4
DOIs	https://doi.org/10.1016/j.actamat.2006.10.004
State	Published - Feb 2007

Keywords

Aluminum alloys
Creep
Metal matrix composites
Precipitation
Zirconium

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

Access to Document

10.1016/j.actamat.2006.10.004

Cite this

@article{5a86ae7dc13d4b268e568854f89b1af6,

title = "Strengthening mechanisms in aluminum containing coherent Al3Sc precipitates and incoherent Al2O3 dispersoids",

abstract = "Dispersion-strengthened-cast aluminum (DSC-Al), consisting of a coarse-grained aluminum matrix containing two populations of particles (30 vol.% of 300 nm Al2O3 incoherent dispersoids and 0.2-0.3 vol.% of 6-60 nm coherent Al3Sc precipitates), was studied. At ambient and elevated temperatures, both populations of particles contribute to strengthening. At 300 °C, creep threshold stresses are considerably higher than for control materials with a single population of either Al2O3 dispersoids or Al3Sc precipitates. This synergistic effect is modeled by considering dislocations pinned at the departure side of incoherent Al2O3 dispersoids (detachment model) and simultaneously subjected to elastic interactions from neighboring coherent Al3Sc precipitates.",

keywords = "Aluminum alloys, Creep, Metal matrix composites, Precipitation, Zirconium",

author = "Karnesky, {Richard A.} and Liang Meng and Dunand, {David C.}",

note = "Funding Information: This research is supported by the US Department of Energy through grant DE-FG02-98ER45721. The authors thank Professor D.N. Seidman (Northwestern University (NU)) for useful conversations and Dr E.A. Marquis (NU, now at Sandia National Laboratories) for useful discussion and for casting the Al–Sc alloy. RAK was partially supported by a Walter P. Murphy Fellowship from NU. ",

year = "2007",

month = feb,

doi = "10.1016/j.actamat.2006.10.004",

language = "English (US)",

volume = "55",

pages = "1299--1308",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

number = "4",

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TY - JOUR

T1 - Strengthening mechanisms in aluminum containing coherent Al3Sc precipitates and incoherent Al2O3 dispersoids

AU - Karnesky, Richard A.

AU - Meng, Liang

AU - Dunand, David C.

N1 - Funding Information: This research is supported by the US Department of Energy through grant DE-FG02-98ER45721. The authors thank Professor D.N. Seidman (Northwestern University (NU)) for useful conversations and Dr E.A. Marquis (NU, now at Sandia National Laboratories) for useful discussion and for casting the Al–Sc alloy. RAK was partially supported by a Walter P. Murphy Fellowship from NU.

PY - 2007/2

Y1 - 2007/2

N2 - Dispersion-strengthened-cast aluminum (DSC-Al), consisting of a coarse-grained aluminum matrix containing two populations of particles (30 vol.% of 300 nm Al2O3 incoherent dispersoids and 0.2-0.3 vol.% of 6-60 nm coherent Al3Sc precipitates), was studied. At ambient and elevated temperatures, both populations of particles contribute to strengthening. At 300 °C, creep threshold stresses are considerably higher than for control materials with a single population of either Al2O3 dispersoids or Al3Sc precipitates. This synergistic effect is modeled by considering dislocations pinned at the departure side of incoherent Al2O3 dispersoids (detachment model) and simultaneously subjected to elastic interactions from neighboring coherent Al3Sc precipitates.

AB - Dispersion-strengthened-cast aluminum (DSC-Al), consisting of a coarse-grained aluminum matrix containing two populations of particles (30 vol.% of 300 nm Al2O3 incoherent dispersoids and 0.2-0.3 vol.% of 6-60 nm coherent Al3Sc precipitates), was studied. At ambient and elevated temperatures, both populations of particles contribute to strengthening. At 300 °C, creep threshold stresses are considerably higher than for control materials with a single population of either Al2O3 dispersoids or Al3Sc precipitates. This synergistic effect is modeled by considering dislocations pinned at the departure side of incoherent Al2O3 dispersoids (detachment model) and simultaneously subjected to elastic interactions from neighboring coherent Al3Sc precipitates.

KW - Aluminum alloys

KW - Creep

KW - Metal matrix composites

KW - Precipitation

KW - Zirconium

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