Determination of mechanical properties of superhard amorphous, nanocrystalline, and microcrystalline materials by laser-based surface acoustic waves

2002 ◽  
Author(s):  
Peter Hess
Keyword(s):  
Mechanical Properties ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Microcrystalline Materials

scholarly journals Nondestructive Evaluation of Thermal Aging in Al6061 Alloy by Measuring Acoustic Nonlinearity of Laser-Generated Surface Acoustic Waves

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 38 ◽  
Author(s):  
Jihyun Jun ◽  
Hogeon Seo ◽  
Kyung-Young Jhang
Keyword(s):  
Mechanical Properties ◽  
Nondestructive Evaluation ◽  
Thermal Aging ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Tensile Tests ◽  
Acoustic Nonlinearity ◽  
Transmission Electron ◽  
Heat Treated ◽  
Elongation To Failure

The structures in high-temperature environments are prone to undergo hardening and embrittlement as a result of thermal aging; this can cause variations in their mechanical properties. Because these changes occur at the microstructural level, it is difficult to evaluate them through linear ultrasonic techniques. In this work, a surface acoustic wave (SAW) was used to measure and compare the acoustic nonlinearity and mechanical properties of Al6061 alloys heat-treated at 220 °C for different durations (0 min, 20 min, 40 min, 1 h, 2 h, 10 h, 100 h, 1000 h). The SAW was generated by a pulsed laser and then received by an interferometer. Moreover, the yield strength, ultimate strength, and elongation to failure were measured by tensile tests. The results demonstrate that the critical variations in the mechanical properties can be detected by monitoring the variation features in the acoustic nonlinearity. Transmission electron microscopy images were captured to observe the microstructural changes, which shows that the acoustic nonlinearity varied according to the change in the precipitation phase. This supports the acoustic nonlinearity measurement using the laser-generated SAW being an effective technique for the fully noncontact nondestructive evaluation of material degradations as well as changes in mechanical properties.

Determination of crystallographic orientation of large grain metals with surface acoustic waves

2012 ◽  
Vol 132 (2) ◽  
pp. 738-745 ◽  
Author(s):  
Wenqi Li ◽  
Steve D. Sharples ◽  
Richard J. Smith ◽  
Matt Clark ◽  
Michael G. Somekh
Keyword(s):  
Crystallographic Orientation ◽  
Acoustic Waves ◽  
Surface Acoustic Waves

Nondestructive determination of film thickness with laser-induced surface acoustic waves

2018 ◽  
Vol 27 (9) ◽  
pp. 096802 ◽  
Author(s):  
Xia Xiao ◽  
Tao Kong ◽  
Hai Yang Qi ◽  
Hui Quan Qing
Keyword(s):  
Film Thickness ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Nondestructive Determination
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