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Ductile TiAl alloy with a Widmanstätten lamellar structure formed by rapid heating

Published online by Cambridge University Press:  31 January 2011

J.P. Cui ,
M.L. Sui ,
Y.Y. Cui  and
D.X. Li
J.P. Cui
Affiliation:
Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
M.L. Sui*
Affiliation:
Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Y.Y. Cui
Affiliation:
Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
D.X. Li
Affiliation:
Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Instead of conventional grain-refinement treatments for improving the ductility of fully lamellar TiAl alloys, multiorientational, lamellar, subcolony refinement with good ductility has been achieved simply by using an electric-current pulse treatment. The microstructural refinement mechanism is attributed to the transformation on heating of γ laths in the prior large-grain lamellar structure to Widmanstätten α in several orientations, which on subsequent cooling forms lamellar structure colonies in multiple orientations. This kind of refined multiple-colony lamellar structure was found to enhance the ductility of the TiAl alloy.

Keywords

DuctilityMicrostructureTransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 4 , April 2008 , pp. 949 - 953
Copyright
Copyright © Materials Research Society 2008

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