Ledbetter Hassel, Tanaka Takaho
Mechanical Engineering University of Colorado Boulder, Colorado 80309.
National Institute for Materials Science, Sengen, Namiki, Tsukuba, Ibaraki 305-0047 Japan.
J Res Natl Inst Stand Technol. 2009 Dec 1;114(6):333-9. doi: 10.6028/jres.114.024. Print 2009 Nov-Dec.
Using resonance ultrasound spectroscopy, we measured the monocrystal elastic-stiffness coefficients, the Voigt C ij, of TiB2. With hexagonal symmetry, TiB2 exhibits five independent C ij: C 11, C 33, C 44, C 12, C 13. Using Voigt-Reuss-Hill averaging, we converted these monocrystal values to quasiisotropic (polycrystal) elastic stiffnesses. Briefly, we comment on effects of voids. From the C ij, we calculated the Debye characteristic temperature, the Grüneisen parameter, and various sound velocities. Our study resolves the enormous differences between two previous reports of TiB2's C ij.
我们使用共振超声光谱法测量了二硼化钛（TiB₂）的单晶弹性刚度系数，即Voigt Cij。具有六方对称性的TiB₂呈现出五个独立的Cij：C11、C33、C44、C12、C13。通过Voigt-Reuss-Hill平均法，我们将这些单晶值转换为准各向同性（多晶）弹性刚度。简要地说，我们讨论了孔隙的影响。根据Cij，我们计算了德拜特征温度、格林艾森参数以及各种声速。我们的研究解决了之前两份关于TiB₂的Cij报告之间的巨大差异。
