Elastic anisotropy and phonon focusing for tetragonal crystals: Application to γ-TiAl
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- 作者：Ping-Ying Tang ; tangpy@gxtc.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Guo-Hua Huang ; Qing-Lian Xie ; Jing-Li Huang ; Feng Ning
- 关键词：Elastic anisotropy ; Phonon focusing ; Slowness surface ; Phonon caustics
- 刊名：Computational Materials Science
- 出版年：2016
- 出版时间：1 June 2016
- 年：2016
- 卷：118
- 期：Complete
- 页码：117-123
- 全文大小：2174 K
文摘
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Numerical indicators and 3D images of elastic anisotropy show γ-TiAl is anisotropic.
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γ-TiAl exhibits high anisotropy in shear but small anisotropy in compressibility.
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For γ-TiAl, slowness surfaces and group velocity surfaces are all nonspherical.
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Anisotropy is highest for ST mode, and then followed by FT mode and L mode.
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Only transverse phonons cause caustics for γ-TiAl.