Title: GRAIN BOUNDARY CHARACTERIZATION AND EVALUATION BY ACOUSTIC SPECTRO-MICROSCOPY

Abstract:
Grain boundary has a significant role to change the mechanical and the elastic properties, resulting in the noticeable change in the acoustic structure. In this paper, the effect of grain boundary on the surface wave propagation have been investigated by using the acoustic spectro-microscopy (ASM) in the ultrasonic frequency range of 40MHz up to 140MHz. Since the focused area can be selected pointwise by using the optical microscope, accurate locational registration and control are available with the spatial relocation of 1~2µm. The surface wave structure was evaluated to characterize the metallic grain boundary (6B) of coarse-grained nickel and the ceramic GB of coarse-grained Nb-doped BaTiO₃.
(Ref. SXVIII-042-97)

Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
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