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Microstructural evolution of cryomilled Ti/Al mixture during high-pressure torsion

Published online by Cambridge University Press:  24 February 2014

Hamed Bahmanpour ,
Yu Sun ,
Tao Hu ,
Dalong Zhang ,
Jittraporn Wongsa-Ngam ,
Terence G. Langdon  and
Enrique J. Lavernia
Hamed Bahmanpour*
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
Yu Sun
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
Tao Hu
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
Dalong Zhang
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
Jittraporn Wongsa-Ngam
Affiliation:
Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Terence G. Langdon
Affiliation:
Departments of Aerospace and Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089-1453; and Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom
Enrique J. Lavernia
Affiliation:
Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
*
a)Address all correspondence to this author. e-mail: hbahman@ucdavis.edu
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Abstract

To provide insight into the influence of the length scale on the kinetics of phase evolution during severe plastic deformation, we studied the microstructure evolution of cryomilled Al and Ti mixture, which is further subjected to high-pressure torsion (HPT). The cryomilled microstructure consisted of elemental Al and Ti, and the subsequent HPT deformation at ambient temperature led to the solid state formation of Al-rich intermetallics. X-ray diffraction peaks originating from TiAl2 and TiAl3 were observed after one revolution of HPT, suggesting a shear strain-assisted formation of the intermetallics. A high resolution transmission electron microscope confirmed the formation of TiAl2 following HPT for one revolution. Further HPT straining led to microstructure refinement and a mixing of the Ti and Al, as well as of any phases formed initially. The solid state formation of the intermetallics and the overall evolution of the microstructure are discussed based on the generation of a high density of lattice defects that evolve under the strain conditions present during HPT.

Keywords

cryomillingTi and Almicrostructurehigh-pressure torsion
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 4 , 28 February 2014 , pp. 578 - 585
Copyright
Copyright © Materials Research Society 2014 

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