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Effect of Fe on Microstructure and Properties of 8xxx Aluminum Conductor Alloys

Authors
  • Pan, Lei1
  • Liu, Kun1
  • Breton, Francis2
  • -Grant Chen, X.1
  • 1 University of Québec at Chicoutimi, Department of Applied Science, Saguenay, QC, G7H 2B1, Canada , Saguenay (Canada)
  • 2 Arvida Research and Development Centre, Rio Tinto, Saguenay, QC, G7S 4K8, Canada , Saguenay (Canada)
Type
Published Article
Journal
Journal of Materials Engineering and Performance
Publisher
Springer US
Publication Date
Oct 11, 2016
Volume
25
Issue
12
Pages
5201–5208
Identifiers
DOI: 10.1007/s11665-016-2373-0
Source
Springer Nature
Keywords
License
Yellow

Abstract

The effect of Fe contents (0.3-0.7 wt.%) on the microstructure, electrical conductivity, mechanical and creep properties of 8xxx aluminum conductor alloys was investigated. Results revealed that the as-cast microstructure of 8xxx alloys was consisted of equiaxed α-Al grains and secondary Fe-rich intermetallics distributed in the interdendritic region. The extruded microstructure showed partially recrystallized structure for 0.3% Fe alloy but only dynamically recovered structures for 0.5 and 0.7% Fe alloys. With increasing Fe contents, the ultimate tensile strength and yield strength were remarkably improved, while the electrical conductivity was slightly decreased. Moreover, the creep resistance was greatly improved, which is attributed to the larger volume fraction of fine intermetallic particles and smaller subgrain size in the higher Fe-containing alloys. The creep threshold stress was found to increase from 24.6 to 33.9 MPa with increasing Fe contents from 0.3 to 0.7%, respectively. The true stress exponent values were close to 3 for all three experimental alloys, indicating that the creep mechanism of 8xxx alloys was controlled by dislocation glide.

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