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Design Approaches and Achievements of Novel Wrought TiAl Alloys for Jet Engine Applications

Published online by Cambridge University Press:  12 February 2019

Hideki Wakabayashi ,
Loris J. Signori ,
Ali Shaaban Open the ORCID record for Ali Shaaban [Opens in a new window] ,
Ryosuke Yamagata ,
Hirotoyo Nakashima  and
Masao Takeyama
Hideki Wakabayashi
Affiliation:
Dept. Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan
Loris J. Signori
Affiliation:
Dept. Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan
Ali Shaaban
Affiliation:
Dept. Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan
Ryosuke Yamagata
Affiliation:
Dept. Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan
Hirotoyo Nakashima
Affiliation:
Dept. Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan
Masao Takeyama*
Affiliation:
Dept. Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan
*
*(Email: [email protected])
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Abstract

Design approaches and achievements for the development of wrought TiAl alloys to be used for LPT and HPC blades are constructed. In case of Ti-Al-M1-M2 quaternary systems, conventional equivalency concept does not work for the alloy design, and a new thermodynamic database for phase diagram calculations in multi-component systems of the alloys is built by introducing the interaction parameters among four phases of β−Ti, α2−Ti3Al, α−Ti and γ−TiAl phases in the systems, in order to reproduce the experimentally determined phase diagrams. Based on the phase diagram calculations, the composition range of a unique phase transformation pathway of β+α→α→β+γ in the multi-component system can be identified, and thus model alloys with excellent hot workability even at higher strain rate and mechanical properties can be successfully proposed. It can be concluded that an introduction of bcc β phase and the morphology control through the phase transformation pathway make it possible to improve the room temperature ductility, creep and fatigue crack propagation resistance.

Keywords

microstructurephase equilibriaphase transformationfatigue
Type
Articles
Information
MRS Advances , Volume 4 , Issue 25-26: Processing and Manufacturing , 2019 , pp. 1465 - 1470
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Copyright
Copyright © Materials Research Society 2019 

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