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Synthesis and Characterization of Mechanically Alloyed and HIP-Consolidated Fe-25Al-10Ti Intermetallic Alloy

Published online by Cambridge University Press:  21 March 2011

Su-Ming Zhu ,
Makoto Tamura ,
Kazushi Sakamoto  and
Kunihiko Iwasaki
Su-Ming Zhu
Affiliation:
Japan Ultra-high Temperature Materials Research Institute, Ube, Yamaguchi 755–0001, Japan
Makoto Tamura
Affiliation:
Japan Ultra-high Temperature Materials Research Institute, Ube, Yamaguchi 755–0001, Japan
Kazushi Sakamoto
Affiliation:
Japan Ultra-high Temperature Materials Research Institute, Ube, Yamaguchi 755–0001, Japan
Kunihiko Iwasaki
Affiliation:
Japan Ultra-high Temperature Materials Research Institute, Ube, Yamaguchi 755–0001, Japan
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Abstract

The present study is concerned with the processing, microstructural characterization, mechanical and tribological properties of fine-grained Fe-25Al-10Ti intermetallic alloy. The alloy was synthesized from elemental powders by mechanical alloying in an attritor-type ball milling system for 100 h, followed by hot isostatic pressing (HIP). After HIP treatment at 1073 K under an ultra-high pressure of 980 MPa, fully dense compacts with a grain size of about 200 nm were produced. Mechanical properties were evaluated by compression tests from room temperature to 1073 K. At room temperature, the alloy exhibits yield strength as high as 2.4 GPa, together with considerable rupture strain of 0.16. The yield strength decreases monotonically with increasing test temperature with no positive temperature dependence observed. The grain growth after high temperature deformation is not severe, indicating that the alloy has a relatively high thermal stability. Finally, tribological properties of the alloy were evaluated by using a ball-on-disk type wear tester and compared with those for gray cast iron, a currently used material for automotive brake rotors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N3.3.1
Copyright
Copyright © Materials Research Society 2001

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References

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