Mechanical properties and microstructure of cast oxide-dispersion-strengthened aluminum

A. M. Redsten; E. M. Klier; A. M. Brown; D. C. Dunand

doi:10.1016/0921-5093(94)09741-0

Mechanical properties and microstructure of cast oxide-dispersion-strengthened aluminum

A. M. Redsten^*, E. M. Klier, A. M. Brown, D. C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

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

89 Scopus citations

Abstract

Oxide-dispersion-strengthened aluminum containing 25 vol.%, 0.28 μm, alumina dispersoids was fabricated by pressure infiltration. The mechanical properties at room and elevated temperature are presented for both as-cast, coarse-grained materials and extruded, fine-grained materials. Although the room temperature yield strength is low (about 60 MPa), the 0.2% proof stress and ultimate tensile stress are much higher (about 200 MPa and 330 MPa respectively) as a result of the very high strain hardening rate. However, the initially high strain hardening rate decreases with strain. This behavior is explained by extending a model by Ashby for dilute dispersion-strengthened metals to the case of a matrix containing a large volume fraction of large particles, whereby the interaction of primary glide dislocations with secondary loops punched by dispersoids is considered.

Original language	English (US)
Pages (from-to)	88-102
Number of pages	15
Journal	Materials Science and Engineering A
Volume	201
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-5093(94)09741-0
State	Published - Oct 1995

Funding

A.M.B. and E.M.K. acknowledge support from the National Science Foundation (NSF) in the form of a Small Business Innovation Research (SBIR) grant (IS1 91-60518) to Chesapeake Composites Corporation. A.M.R. and D.C.D. acknowledge the support of the Department of Defence (DOD) (in the form of a National Defense Science and Engineering Graduate (ND-SEG fellowship) and AMAX (in the form of an endowed chair at the Massachusetts Institute of Technology (MIT)) respectively. The authors are grateful to Dr. W. Hunt (Alcoa) for room temperature mechanical testing and optical microscopy of the as-cast material and Dr. R. Wills (TRW) and Dr. M. Zedalis (Allied Signal) for elevated temperature tensile testing of extruded ODS-Al and ODS-AlMg respectively.

Keywords

Aluminum
Dispersion strengthening
Mechanical properties
Microstructure

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/0921-5093(94)09741-0

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title = "Mechanical properties and microstructure of cast oxide-dispersion-strengthened aluminum",

abstract = "Oxide-dispersion-strengthened aluminum containing 25 vol.%, 0.28 μm, alumina dispersoids was fabricated by pressure infiltration. The mechanical properties at room and elevated temperature are presented for both as-cast, coarse-grained materials and extruded, fine-grained materials. Although the room temperature yield strength is low (about 60 MPa), the 0.2% proof stress and ultimate tensile stress are much higher (about 200 MPa and 330 MPa respectively) as a result of the very high strain hardening rate. However, the initially high strain hardening rate decreases with strain. This behavior is explained by extending a model by Ashby for dilute dispersion-strengthened metals to the case of a matrix containing a large volume fraction of large particles, whereby the interaction of primary glide dislocations with secondary loops punched by dispersoids is considered.",

keywords = "Aluminum, Dispersion strengthening, Mechanical properties, Microstructure",

author = "Redsten, {A. M.} and Klier, {E. M.} and Brown, {A. M.} and Dunand, {D. C.}",

note = "Funding Information: A.M.B. and E.M.K. acknowledge support from the National Science Foundation (NSF) in the form of a Small Business Innovation Research (SBIR) grant (IS1 91-60518) to Chesapeake Composites Corporation. A.M.R. and D.C.D. acknowledge the support of the Department of Defence (DOD) (in the form of a National Defense Science and Engineering Graduate (ND-SEG fellowship) and AMAX (in the form of an endowed chair at the Massachusetts Institute of Technology (MIT)) respectively. The authors are grateful to Dr. W. Hunt (Alcoa) for room temperature mechanical testing and optical microscopy of the as-cast material and Dr. R. Wills (TRW) and Dr. M. Zedalis (Allied Signal) for elevated temperature tensile testing of extruded ODS-Al and ODS-AlMg respectively.",

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doi = "10.1016/0921-5093(94)09741-0",

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journal = "Materials Science and Engineering A",

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AU - Redsten, A. M.

AU - Klier, E. M.

AU - Brown, A. M.

AU - Dunand, D. C.

N1 - Funding Information: A.M.B. and E.M.K. acknowledge support from the National Science Foundation (NSF) in the form of a Small Business Innovation Research (SBIR) grant (IS1 91-60518) to Chesapeake Composites Corporation. A.M.R. and D.C.D. acknowledge the support of the Department of Defence (DOD) (in the form of a National Defense Science and Engineering Graduate (ND-SEG fellowship) and AMAX (in the form of an endowed chair at the Massachusetts Institute of Technology (MIT)) respectively. The authors are grateful to Dr. W. Hunt (Alcoa) for room temperature mechanical testing and optical microscopy of the as-cast material and Dr. R. Wills (TRW) and Dr. M. Zedalis (Allied Signal) for elevated temperature tensile testing of extruded ODS-Al and ODS-AlMg respectively.

PY - 1995/10

Y1 - 1995/10

N2 - Oxide-dispersion-strengthened aluminum containing 25 vol.%, 0.28 μm, alumina dispersoids was fabricated by pressure infiltration. The mechanical properties at room and elevated temperature are presented for both as-cast, coarse-grained materials and extruded, fine-grained materials. Although the room temperature yield strength is low (about 60 MPa), the 0.2% proof stress and ultimate tensile stress are much higher (about 200 MPa and 330 MPa respectively) as a result of the very high strain hardening rate. However, the initially high strain hardening rate decreases with strain. This behavior is explained by extending a model by Ashby for dilute dispersion-strengthened metals to the case of a matrix containing a large volume fraction of large particles, whereby the interaction of primary glide dislocations with secondary loops punched by dispersoids is considered.

AB - Oxide-dispersion-strengthened aluminum containing 25 vol.%, 0.28 μm, alumina dispersoids was fabricated by pressure infiltration. The mechanical properties at room and elevated temperature are presented for both as-cast, coarse-grained materials and extruded, fine-grained materials. Although the room temperature yield strength is low (about 60 MPa), the 0.2% proof stress and ultimate tensile stress are much higher (about 200 MPa and 330 MPa respectively) as a result of the very high strain hardening rate. However, the initially high strain hardening rate decreases with strain. This behavior is explained by extending a model by Ashby for dilute dispersion-strengthened metals to the case of a matrix containing a large volume fraction of large particles, whereby the interaction of primary glide dislocations with secondary loops punched by dispersoids is considered.

KW - Aluminum

KW - Dispersion strengthening

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KW - Microstructure

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Mechanical properties and microstructure of cast oxide-dispersion-strengthened aluminum

Abstract

Funding

Keywords

ASJC Scopus subject areas

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