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Compression of Micropillars of TiAl Coexisting with Ti3Al

Published online by Cambridge University Press:  15 March 2011

Kazuki Fujimura ,
Kyosuke Kishida ,
Katsushi Tanaka  and
Haruyuki Inui
Kazuki Fujimura
Affiliation:
Department of Materials Science and Engineering, Kyoto University Sakyo-ku, Kyoto 606-8501, Japan
Kyosuke Kishida
Affiliation:
Department of Materials Science and Engineering, Kyoto University Sakyo-ku, Kyoto 606-8501, Japan
Katsushi Tanaka
Affiliation:
Department of Mechanical Engineering, Kobe University 1-1 Rokkoudai-cho, Nada-ku, Kobe 657-8501, Japan
Haruyuki Inui
Affiliation:
Department of Materials Science and Engineering, Kyoto University Sakyo-ku, Kyoto 606-8501, Japan
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Abstract

Square-shaped micropillar of nearly stoichiometric TiAl single crystals with various loading axis orientations were prepared from TiAl PST crystals by focused ion beam (FIB) technique and deformed in compression using a micro hardness testing machine equipped with a flat diamond tip in order to investigate the values of CRSS for the three types of operative deformation modes, namely ordinary slip, superlattice slip and twinning. The selective activation of the three types of deformation modes was confirmed to be achieved by compression tests of -oriented single crystalline micropillars, respectively. The average CRSS values for ordinary slip, superlattice slip and deformation twinning obtained for micropillars with an initial side length between 3.8 and 7.9μm were estimated to be about 145, 284 and 113 MPa, respectively.

Keywords

strengthstress/strain relationshipalloy
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n05-18
Copyright
Copyright © Materials Research Society 2011

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References

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