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Strain-assisted Formation of Nano-scaled Lamellar Structure in Ti-39at%Al Single Crystals

Published online by Cambridge University Press:  01 February 2011

Yuchiro Koizumi ,
Takayuki Tanaka ,
Fujita Takeshi  and
Minamino Yoritoshi
Yuchiro Koizumi
Affiliation:
koizumi@ams.eng.osaka-u.ac.jp, Osaka University, Department of Adaptive Machine Systems, 2-1 Yamadaoka, Suita, 565-0871, Japan, 81-6-6879-7434, 81-6-6879-4174
Takayuki Tanaka
Affiliation:
tanaka.takayuki@gmail.com, Osaka University, Department of Adaptive Machine Systems, 2-1 Yamadaoka, Suita, 565-0871, Japan
Fujita Takeshi
Affiliation:
takeshi.fujita@ams.eng.osaka-u.ac.jp, Osaka University, Department of Adaptive Machine Systems, 2-1 Yamadaoka, Suita, 565-0871, Japan
Minamino Yoritoshi
Affiliation:
minamino@ams.eng.osaka-u.ac.jp, Osaka University, Department of Adaptive Machine Systems, 2-1 Yamadaoka, Suita, 565-0871, Japan
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Abstract

We have studied the effects of straining prior to annealing for lamellar structure formation in a Ti-39at%Al single crystal intending to accelerate the lamellar structure formation and decrease the resultant lamellar spacing via preferential nucleation of γ-TiAl phase at dislocations in α2-Ti3Al phase. In a crystal cold-rolled to 10% reduction before annealing, a fine lamellar structure with 88 nm average spacing was formed by annealing at 1073 K for 1×104 s whereas no lamella were observed in the crystal subjected to the same annealing without cold-rolling. In addition, it was also demonstrated that when the crystal is locally strained by indentation and annealed at 1073 K for 1×104 s, a lamellar structure with 43 nm average lamellar spacing is formed in areas near the indentation and there were no lamella beyond these areas. This means that distributions of lamellae can be controlled by controlling the distribution of strain before annealing.

Keywords

dislocationsnanostructurenucleation & growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1059: Symposium KK – Nanoscale Pattern Formation , 2007 , 1059-KK04-02
Copyright
Copyright © Materials Research Society 2008

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References

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