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Al stabilized TiC twinning platelets

Published online by Cambridge University Press:  23 April 2014

Hui Zhang ,
Xiaohui Wang ,
Zhaojin Li  and
Yanchun Zhou
Hui Zhang
Affiliation:
High-Performance Ceramic Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; and University of Chinese Academy of Sciences, Beijing 100049, China
Xiaohui Wang
Affiliation:
High-Performance Ceramic Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Zhaojin Li
Affiliation:
High-Performance Ceramic Division, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; and University of Chinese Academy of Sciences, Beijing 100049, China
Yanchun Zhou*
Affiliation:
Science and Technology of Advanced Functional Composite Laboratory, ARIMPT, Beijing 100076, China
*
a) Address all correspondence to this author. e-mail: yczhou714@gmail.com
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Abstract

Titanium carbide (TiC) twins are believed to be extremely unstable because of their high twin boundary energy. Here, we report that TiC twins are always presented in platelets with dimensions of 2–3 μm in length and less than 300 nm in width. In-depth microstructural characterizations by high-resolution transmission electron microscopy demonstrate that Al atoms at the twin boundary play a decisive role in stabilizing TiC twins. With different amounts of Al, perfect and defective TiC twins are formed. For perfect twins, three types of twin boundaries can be formed depending on the amount of remaining Al at the twin boundary. With inadequate Al, the TiC twins become defective with certain degrees of deviation from the perfect twin orientation. Based on a detailed analysis of the microstructure of the twin boundaries, a mechanism for the formation and stabilization of TiC twins is proposed.

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Articles
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Journal of Materials Research , Volume 29 , Issue 9 , 14 May 2014 , pp. 1113 - 1121
Copyright
Copyright © Materials Research Society 2014 

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