Department of Materials Science and Engineering, Edison Joining Technology Center, The Ohio State University, 1248 Arthur E. Adams Drive, Columbus, Ohio 43221, USA.
J Acoust Soc Am. 2009 Dec;126(6):2998-3007. doi: 10.1121/1.3245032.
A methodology for measuring elastic constants of different phases in materials with lamellar microstructure by line-focus acoustic microscopy is developed. The material microstructure investigated is modeled by generally anisotropic multilayers arbitrarily inclined to the sample surface on which acoustic microscopy measurements are performed. To calculate surface acoustic wave (SAW) propagation in such structures quasi-static effective elastic constants are determined and compared with calculated frequency-dependent constants. As a model material, practically important, Ti-6Al-2Sn-4Zr-2Mo alloy is selected. Time-resolved line-focus acoustic microscopy experiments are performed on a Ti-6242 alpha/beta single colony (Ti-6Al-2Sn-4Zr-2Mo alloy) and on a Ti-6Al alpha-phase single crystal for which elastic constants of different phases are determined using inversion of measured SAW velocities. To validate the experimental methodology, SAW velocities in an X-cut quartz crystal are measured as a function of sample orientation angle and compared with predictions based on the known elastic moduli of quartz.
提出了一种通过线聚焦声学显微镜测量层状微观结构材料中不同相弹性常数的方法。研究的材料微观结构通过任意倾斜于进行声学显微镜测量的样品表面的一般各向异性多层来建模。为了计算这种结构中的表面声波（SAW）传播，确定了准静态有效弹性常数，并将其与计算的频率相关常数进行了比较。作为模型材料，选择了具有实际重要性的 Ti-6Al-2Sn-4Zr-2Mo 合金。在 Ti-6242 alpha/beta 单胞（Ti-6Al-2Sn-4Zr-2Mo 合金）和 Ti-6Al alpha 相单晶上进行了时间分辨线聚焦声学显微镜实验，使用测量的 SAW 速度的反演确定了不同相的弹性常数。为了验证实验方法，测量了 X 切石英晶体中的 SAW 速度作为样品取向角度的函数，并与基于石英已知弹性模量的预测进行了比较。
