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Non-equilibrium Ti-Fe bulk alloys with ultra-high strength and enhanced ductility

Published online by Cambridge University Press:  01 February 2011

Dmitri V. Louzguine-Luzgin ,
Larissa V. Louzguina-Luzgina ,
Hidemi Kato  and
Akihisa Inoue
Dmitri V. Louzguine-Luzgin
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1–1, Aoba-Ku, Sendai 980–8577, Japan
Larissa V. Louzguina-Luzgina
Affiliation:
Research and Development Project, CREST, Japan Science and Technology Agency, Sendai, 985–8577, Japan
Hidemi Kato
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1–1, Aoba-Ku, Sendai 980–8577, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1–1, Aoba-Ku, Sendai 980–8577, Japan
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Abstract

The high-strength and ductile hypo-, hyper- and eutectic Ti-Fe alloys were formed in the shape of the arc-melted ingots with the dimensions of about 25–40 mm in diameter and 10–15 mm in height. The structure of the samples consists of cubic Pm 3 m TiFe and BCC Im 3 m β-Ti supersaturated solid solution phase. The arc-melted hypereutectic Ti65Fe35 alloy has a dispersed structure consisting of the primary TiFe phase and submicron-size eutectic structure. This alloy exhibits excellent mechanical properties: a Young's modulus of 149 GPa, a high mechanical fracture strength of 2.2 GPa, a 0.2 % yield strength of 1.8 GPa and 6.7 % ductility. The hard round-shaped intermetallic TiFe phase and the supersaturated β-Ti solid solution result in a high strength of the Ti65Fe35 alloy which in addition has much higher ductility compared to that of the nanostructured or glassy alloys. The reasons for the high ductility of the hypereutectic alloy are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 851: Symposium NN – Materials for Space Applications , 2004 , NN5.13
Copyright
Copyright © Materials Research Society 2005

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