Creep behavior of a reinforced Al-7005 alloy: Implications for the creep processes in metal matrix composites
- Univ. of Southern California, Los Angeles, CA (United States)
Creep tests were conducted on an Al-7005 matrix alloy reinforced with 20 vol.% of irregularly shaped Al{sub 2}O{sub 3} particulates. The results, which cover almost six orders of magnitude of strain rate, give high values for the apparent stress exponent and the apparent activation energy for creep. The introduction of a threshold stress into the analysis leads to a stress exponent of {approximately} 4.4 and data which are consistent with creep controlled by a dislocation climb process and class M behavior in the Al-7005 matrix alloy. These results are compared with an earlier report of creep behavior in an Al-6061 matrix composite, also reinforced with 20 vol.% of irregularly shaped Al{sub 2}O{sub 3} particulates, where the stress exponent was close to three and the data were consistent with control by a dislocation glide process and class A behavior in the Al-6061 matrix alloy. It is shown that the creep of metal matrix composites is controlled by creep of the matrix alloys and there is a consequent division of the creep behavior of the composites into two types, class M and class A, as in the creep of solid solution alloys.
- OSTI ID:
- 605841
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 4 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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