Effect of Fe-rich particles and solutes on the creep behaviour of 8xxx alloys

Abstract

The creep behavior of 8xxx aluminum conductor alloys with different quantities of Fe-rich particles and solutes was investigated. Creep resistance was significantly improved with large amounts of Fe-rich particles and solutes. At 100 °C, a high Fe solute content (0.023 wt.%) had a stronger effect on creep resistance than FeAl₃ particles. However, as the temperature increased to 150 and 200 °C, the effect of a high amount of FeAl₃ particles (2.5 vol.%) was stronger. The threshold stress increased with increasing FeAl₃ particle and Fe solute contents, with the effect of each factor being independent, but it decreased with increasing temperature. The true stress exponents were calculated to be 3.1, 3.8, and 4.5 at 100, 150 and 200 °C, respectively.

GRAPHICAL ABSTRACT

Keywords:

• 8xxx Al conductor alloys
• Creep properties
• Fe-rich intermetallics
• Fe solutes
• Threshold stress

Acknowledgements

The authors acknowledge the financial support from Natural Science and Engineering Research Council of Canada (NSERC) and Rio Tinto through the NSERC Industrial Research Chair in Metallurgy of Aluminium Transformation at the University of Quebec at Chicoutimi.

ORCID

F. A. Mirza http://orcid.org/0000-0002-8937-6113

Additional information

Funding

This work was supported by Rio Tinto; Natural Science and Engineering Research Council of Canada.