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Microstructure Design for Enhancement of Room-temperature Ductility in Multi-component TiAl Alloys

Published online by Cambridge University Press:  03 May 2019

Ryosuke Yamagata ,
Yotaro Okada ,
Hideki Wakabayashi ,
Hirotoyo Nakashima  and
Masao Takeyama
Ryosuke Yamagata*
Affiliation:
Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, S8-8, 2-12-1, Ookayama, Megro-ku, Tokyo, 152-8552, Japan.
Yotaro Okada
Affiliation:
Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, S8-8, 2-12-1, Ookayama, Megro-ku, Tokyo, 152-8552, Japan.
Hideki Wakabayashi
Affiliation:
Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, S8-8, 2-12-1, Ookayama, Megro-ku, Tokyo, 152-8552, Japan.
Hirotoyo Nakashima
Affiliation:
Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, S8-8, 2-12-1, Ookayama, Megro-ku, Tokyo, 152-8552, Japan.
Masao Takeyama
Affiliation:
Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, S8-8, 2-12-1, Ookayama, Megro-ku, Tokyo, 152-8552, Japan.
*
*(Email: yamagata.r.aa@m.titech.ac.jp)
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Abstract

Effects of microstructure constituents of α2-Ti3Al/γ-TiAl lamellae, β-Ti grains and γ grains, with various volume fractions on room-temperature ductility of γ-TiAl based alloys have been studied. The ductility of the alloys containing β phase of about 20% in volume increases to more than 1% as the volume fraction of γ phase increases to 80%. However, γ single phase alloys show very limited ductility of less than 0.2%. The present results, thus, confirmed the significant contribution of β phase to enhancement of the room-temperature ductility in multi-component TiAl alloys.

Keywords

stress/strain relationshipmicrostructurefractureductility
Type
Articles
Information
MRS Advances , Volume 4 , Issue 25-26: Processing and Manufacturing , 2019 , pp. 1523 - 1529
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Copyright
Copyright © Materials Research Society 2019 

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