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Compression Deformation Structures of Single Crystal TiAl

Published online by Cambridge University Press:  26 February 2011

B. Y. Huang,
B. F. Oliver and
W. C. Oliver
B. Y. Huang
Affiliation:
Powder Metallurgy Institute, South Central University of Technology, Changsha, Huuan, People's Republic of China
B. F. Oliver
Affiliation:
Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2200
W. C. Oliver
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, TN 37831-6116
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Abstract

The compression deformation behavior of single crystalline TiAl was examined by transmission electron microscopy (T.E.M.). The relatively pure Ti–56 a/o Al crystal was containerless processed in ultrapure hydrogen. The crystal growth direction is 18° off (011) and 60° off [111] in the [011]– [111]-[010] unit triangle. At low stresses, a/2 [110] type dislocations were observed. a/2 [110] dislocations appeared at slightly higher stresses. Additional plastic deformation initiates twinning. Twinning plays an important role at higher stresses. Diffraction results indicate that most of the twins have the (111) mirror plane.

A small amount of (1 11) twins were also observed. Superdislocations of the a<011> type were not observed to contribute to the plastic deformation in this crystal. The results indicate that plastic deformation by twinning follows the low density of ordinary dislocations.

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