Characterization of Stress at a Ceramic/Metal Joined Interface by the Vz Technique of Scanning Acoustic Microscopy

2002 ◽  
Vol 124 (3) ◽  
pp. 336-342 ◽  
Author(s):  
Chiaki Miyasaka ◽  
Bernard R. Tittmann ◽  
Shun-Ichiro Tanaka
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Wave Velocity ◽  
Dissimilar Materials ◽  
Acoustic Microscopy ◽  
Scanning Acoustic Microscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wave Velocities

It is well known that the process of heating and then cooling dissimilar materials introduces considerable stress at and near the interface. In this article, first, the surface wave velocity distributions obtained with the Vz curve technique were found to compare well with residual stress distribution measured by the finely collimated X-ray diffraction technique. Second, a delamination was introduced at the interface. The Vz curve technique was then used again to measure the surface acoustic wave velocity along the interface. The defective specimens showed significantly different patterns of surface acoustic wave velocities. Thus, this study presents useful guidelines in discriminating between sound and defective ceramic/metal joints by scanning acoustic microscopy.

Scanning Acoustic Microscopy and x-ray Diffraction Investigation of Near Crack Tip Stresses

1999 ◽  
Vol 591 ◽  
Author(s):  
S. Sathish ◽  
R. W. Martin
Keyword(s):  
Rayleigh Wave ◽  
Crack Tip ◽  
Acoustic Velocity ◽  
Acoustic Microscopy ◽  
Scanning Acoustic Microscopy ◽  
X Ray Diffraction ◽  
Rayleigh Wave Velocity ◽  
X Ray ◽  
Wave Velocities ◽  
Velocity Images

ABSTRACTScanning Acoustic Microscopy has been used to measure and map the Rayleigh wave velocity and the Surface Skimming Longitudinal wave velocities near a crack tip in a sample of Ti-6AI-4V. X-ray diffraction measurements have been performed to map the stress in the same region of the sample. The differences in the contrast between the two acoustic velocity images and their sensitivity to stress are examined. Similarities between x-ray stress images and acoustic velocity images are discussed.

Investigation of surface acoustic wave fields in silicon crystals by x-ray diffraction: A dynamical theory approach

2005 ◽  
Vol 97 (11) ◽  
pp. 113505 ◽  
Author(s):  
R. Tucoulou ◽  
O. Mathon ◽  
C. Ferrero ◽  
V. Mocella ◽  
D. V. Roshchupkin ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Dynamical Theory ◽  
Theory Approach ◽  
X Ray Diffraction ◽  
Wave Fields ◽  
X Ray ◽  
Silicon Crystals

X‐ray diffraction study of surface acoustic wave device under acoustic excitation

1993 ◽  
Vol 73 (12) ◽  
pp. 8647-8649 ◽  
Author(s):  
E. Zolotoyabko ◽  
E. Jacobsohn ◽  
D. Shechtman ◽  
B. Kantor ◽  
J. Salzman
Keyword(s):  
Acoustic Wave ◽  
Diffraction Study ◽  
Surface Acoustic Wave ◽  
Acoustic Excitation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Surface Acoustic Wave Device ◽  
Acoustic Wave Device ◽  
Wave Device

X-ray diffraction from perfect silicon crystals distorted by surface acoustic waves

2000 ◽  
Vol 33 (4) ◽  
pp. 1019-1022 ◽  
Author(s):  
R. Tucoulou ◽  
R. Pascal ◽  
M. Brunel ◽  
O. Mathon ◽  
D. V. Roshchupkin ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Acoustic Waves ◽  
Crystal Surface ◽  
Source Region ◽  
Surface Acoustic Waves ◽  
X Ray Diffraction ◽  
Zno Film ◽  
Near Surface ◽  
X Ray

High-resolution X-ray diffraction measurements were carried out on ZnO/Si devices under surface acoustic wave excitation and revealed some very clear satellite diffraction peaks that are obtained from the sinusoidal modulation of the near-surface region. This experiment shows that the propagation of a Rayleigh surface acoustic wave in a perfect crystal acts as a dynamical diffraction grating. The variation of the acoustic velocity has been followed across the crystal surface from the acoustic source region (beneath the ZnO film) to the far field region (not covered by the ZnO film).

Synthesis of Superhard and Ultrahard Materials by 3D-polymerization of C60, C70 Fullerenes Under High Pressure (15 GPa) and Temperatures up to 1820 K

2006 ◽  
Vol 61 (12) ◽  
pp. 1547-1554 ◽  
Author(s):  
Vladimir D. Blank ◽  
Sergei G. Buga ◽  
Gennadi A. Dubitsky ◽  
Nadejda R. Serebryanaya ◽  
Vyatcheslav M. Prokhorov ◽  
...  
Keyword(s):  
High Pressure ◽  
Sound Wave ◽  
Acoustic Microscopy ◽  
X Ray Diffraction ◽  
Quenching Rate ◽  
X Ray ◽  
Wave Velocities ◽  
Microscopy Techniques ◽  
Temperature Maps ◽  
Microscopy Images

Solid fullerenes C60 and C70 have been treated at high pressure of 15 GPa and high temperatures of 520 - 1820 K for a time of exposure of 60 s and a quenching rate of 300 K s−1 using a toroid-type apparatus. X-ray diffraction and Raman spectra confirm the realization of 3D-polymerized phases in these solids at 15 GPa. The pressure/temperature maps of synthesis of metastable carbon phases on the basis of C60 and C70 have thus been extended to 15 GPa. The longitudinal and shear sound wave velocities were measured by acoustic microscopy techniques. A maximum sound wave velocity of (21±1)×105 m s−1 was observed in the sample synthesized from C60 at T = 1170 K. The elastic constants were calculated using experimental data. The acoustic microscopy images of experimental samples have been investigated.

Coherent and diffuse X-ray scattering in crystals modulated by a surface acoustic wave

2010 ◽  
Vol 43 (3) ◽  
pp. 520-530 ◽  
Author(s):  
Vasily I. Punegov ◽  
Yakov I. Nesterets ◽  
Dmitry V. Roshchupkin
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Diffuse Scattering ◽  
Block Size ◽  
Diffraction Theory ◽  
Crystal Defects ◽  
Reciprocal Space ◽  
X Ray Diffraction ◽  
X Ray ◽  
Main Diffraction Peak

Equations describing the coherent and diffuse scattering in a crystal modulated by a surface acoustic wave (SAW) are derived using the dynamical X-ray diffraction theory. The effect of depth attenuation of the Rayleigh surface wave amplitude on the crystal rocking curve profiles is investigated. Results of the numerical simulation of the dynamical diffraction in a mosaic crystal modulated by a SAW, taking into account a block size distribution, are presented. It is shown that the diffuse scattering is distributed in the reciprocal space not only in the vicinity of the main diffraction peak but also about the satellite diffraction peaks, and this distribution depends on the size fluctuations of the crystal defects. Theoretical reciprocal space maps and rocking curves are compared with the corresponding experimental results.

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