Mechanical properties of dual-phase alloys of B2 and icosahedral phases in the Al–Cu–Fe system

Abstract

Intermetallic alloys with B2 structure and dual-phase alloys of the B2 phase and an icosahedral (i-) phase have been produced, and their mechanical properties have been investigated. Vickers hardness measurements and compression experiments have shown that the dual-phase alloys have considerably higher strength than that of the B2 single-phase alloy up to a high temperature of around 750 K. The dual-phase alloys have also exhibited much better ductility than i-single-phase alloys. One possibility to be pointed out is that we can further design a high-strength and good-ductility alloy by tuning the volume fraction, size and morphology of the i-phase precipitates.

Acknowledgements

We thank Prof. S. Takeuchi of the Dept. of Mater. Sci. and Tech. of Sci. Univ. of Tokyo, for his valuable comments and discussion. This work was financially supported by Core Research in Environmental Science and Technology (CREST), Japan Science and Technology Corporation.