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Investigation of the structure and properties of hypereutectic Ti-based bulk alloys

Published online by Cambridge University Press:  26 February 2011

Dmitri V. Louzguine-Luzgin ,
Larissa V. Louzguina-Luzgina  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
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2–1–1, Aoba-Ku, Sendai 980–8577, Japan
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Abstract

Structure and mechanical properties of binary Ti-TM (TM-other transition metals) and ternary Ti-Fe-(TM, B or Si) alloys produced in the shape of the arc-melted ingots of about 25 mm diameter and 10 mm height are studied. The formation of high-strength and ductile hypereutectic alloys was achieved in the Ti-Fe, Ti-Fe-Cu and Ti-Fe-B systems. The structures of the high-strength and ductile hypereutectic alloys studied by X-ray diffractometry and scanning electron microscopy were found to consist of the primary cubic Pm3 m intermetallic compound (TiFe-phase or a solid solution on its base) and a dispersed eutectic consisting of this Pm3m intermetallic compound + BCC Im 3 m β-Ti supersaturated solid solution phase. The hypereutectic Ti-Fe alloy showed excellent compressive mechanical properties. The addition of Cu improves its ductility. B addition increased mechanical strength. Ni, Cr and Mn additions caused embrittlement owing to the formation of alternative intermetallic compounds. The deformation behaviour and the fractography of the Ti-based alloys were studied in details. The reasons for the high strength and good ductility of the hypereutectic alloys are discussed.

Keywords

Ti-based alloysmechanical propertiesintermetallic compoundhigh strengthductility.
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S4.3
Copyright
Copyright © Materials Research Society 2005

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References

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