Precipitation strengthening of a Mg-Al-Ca - Based AXJ530 die-cast alloy

A. Suzuki; N. D. Saddock; J. R. TerBush; B. R. Powell; J. W. Jones; T. M. Pollock

doi:10.1007/s11661-007-9455-4

Precipitation strengthening of a Mg-Al-Ca - Based AXJ530 die-cast alloy

A. Suzuki, N. D. Saddock, J. R. TerBush, B. R. Powell, J. W. Jones, T. M. Pollock

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

Abstract

Precipitation of the Al₂Ca phase in theα-Mg phase of the Mg-Al-Ca-based AXJ530 die-cast alloy and the effect of precipitation hardening on the creep resistance were studied. Precipitation of the Al₂Ca phase is suppressed in the die-casting process due to its high cooling rate, but precipitation was observed during subsequent isothermal heat treatments above 448 K. The precipitate has a disk-shaped morphology parallel to the basal plane of the α-Mg matrix phase and increases hardness by aging in the temperature range of 448 to 573 K. The creep resistance of the die-cast material at 448 K was improved by a factor of 1.5 ∼ 2, by a peak-age heat treatment at 523 K for 1 hour. Improvement in strength is limited by the low volume fraction of the precipitates; however, the precipitates are effective obstacles against dislocations gliding on nonbasal planes during creep deformation.

Original language	English (US)
Pages (from-to)	696-702
Number of pages	7
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	39 A
Issue number	3
DOIs	https://doi.org/10.1007/s11661-007-9455-4
State	Published - Mar 2008
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

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title = "Precipitation strengthening of a Mg-Al-Ca - Based AXJ530 die-cast alloy",

abstract = "Precipitation of the Al2Ca phase in theα-Mg phase of the Mg-Al-Ca-based AXJ530 die-cast alloy and the effect of precipitation hardening on the creep resistance were studied. Precipitation of the Al2Ca phase is suppressed in the die-casting process due to its high cooling rate, but precipitation was observed during subsequent isothermal heat treatments above 448 K. The precipitate has a disk-shaped morphology parallel to the basal plane of the α-Mg matrix phase and increases hardness by aging in the temperature range of 448 to 573 K. The creep resistance of the die-cast material at 448 K was improved by a factor of 1.5 ∼ 2, by a peak-age heat treatment at 523 K for 1 hour. Improvement in strength is limited by the low volume fraction of the precipitates; however, the precipitates are effective obstacles against dislocations gliding on nonbasal planes during creep deformation.",

author = "A. Suzuki and Saddock, {N. D.} and TerBush, {J. R.} and Powell, {B. R.} and Jones, {J. W.} and Pollock, {T. M.}",

note = "Funding Information: This research was supported by NSF FRG Grant Nos. F015408 and DMR-0309468. The authors are grateful to C.J. Torbet and C. Henderson (University of Michigan) for their assistance. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2008",

month = mar,

doi = "10.1007/s11661-007-9455-4",

language = "English (US)",

volume = "39 A",

pages = "696--702",

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AU - Suzuki, A.

AU - Saddock, N. D.

AU - TerBush, J. R.

AU - Powell, B. R.

AU - Jones, J. W.

AU - Pollock, T. M.

N1 - Funding Information: This research was supported by NSF FRG Grant Nos. F015408 and DMR-0309468. The authors are grateful to C.J. Torbet and C. Henderson (University of Michigan) for their assistance. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2008/3

Y1 - 2008/3

N2 - Precipitation of the Al2Ca phase in theα-Mg phase of the Mg-Al-Ca-based AXJ530 die-cast alloy and the effect of precipitation hardening on the creep resistance were studied. Precipitation of the Al2Ca phase is suppressed in the die-casting process due to its high cooling rate, but precipitation was observed during subsequent isothermal heat treatments above 448 K. The precipitate has a disk-shaped morphology parallel to the basal plane of the α-Mg matrix phase and increases hardness by aging in the temperature range of 448 to 573 K. The creep resistance of the die-cast material at 448 K was improved by a factor of 1.5 ∼ 2, by a peak-age heat treatment at 523 K for 1 hour. Improvement in strength is limited by the low volume fraction of the precipitates; however, the precipitates are effective obstacles against dislocations gliding on nonbasal planes during creep deformation.

AB - Precipitation of the Al2Ca phase in theα-Mg phase of the Mg-Al-Ca-based AXJ530 die-cast alloy and the effect of precipitation hardening on the creep resistance were studied. Precipitation of the Al2Ca phase is suppressed in the die-casting process due to its high cooling rate, but precipitation was observed during subsequent isothermal heat treatments above 448 K. The precipitate has a disk-shaped morphology parallel to the basal plane of the α-Mg matrix phase and increases hardness by aging in the temperature range of 448 to 573 K. The creep resistance of the die-cast material at 448 K was improved by a factor of 1.5 ∼ 2, by a peak-age heat treatment at 523 K for 1 hour. Improvement in strength is limited by the low volume fraction of the precipitates; however, the precipitates are effective obstacles against dislocations gliding on nonbasal planes during creep deformation.

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Precipitation strengthening of a Mg-Al-Ca - Based AXJ530 die-cast alloy

Abstract

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