Time-resolved x-ray diffraction study of laser-induced shock and acoustic waves in single crystalline silicon

Abstract

A rod of single crystalline silicon has been subjected to high-power nanosecond laser pulses inducing ultrasonic and shock waves traveling into the bulk of the material. Stroboscopic time-resolved high-energy x-ray diffraction measurements were carried out in situ to probe for strain states in the bulk of the sample. First, a supersonic shock front is observed which moves faster than the longitudinal acoustic phonons. Following the shock front, a much slower bunch of waves travels along the crystal. The x-ray diffraction records obtained in different configurations reflect a strong dependence of the wave propagation on the sample geometry. These results offer an experimental approach for the investigation of coherent phonons, structural phase transformations, plastic deformations induced during shock peening, and for the development of x-ray free-electron-laser optics.

Thermo-mechanical processing in a synchrotron beam

“…An end of development on both source and detector side is not in sight. Snapshots on ultrashort time scales have already been taken during shock wave compression [29,30], while full movies investigating in situ dynamic loading should be feasible within the next decade [31].…”

Hysteresis-like attenuation of ultrasound in severely plastically deformed nickel

“…Laser induced ultrasound provides essentially broadband probe pulses from few nanosecond down to tens of picoseconds, allowing a diversity of applications in material science and nondestructive methods [10][11][12][13][14]. The achievable level of elastic strain may involve nonlinear elastic deformation and can be used as the noncontact method for the material strength estimation [15][16][17]. This study reports on the broadband measurements of the frequency-dependent attenuation of the timeresolved laser induced ultrasound pulses in an HPT nickel sample.…”

Attenuation of ultrasound in severely plastically deformed nickel

“…Laser induced ultrasound provides essentially broadband probe pulses from few nanosecond down to tens of picoseconds, allowing a diversity of applications in material science and nondestructive methods [10–14] . The achievable level of elastic strain may involve nonlinear elastic deformation and can be used as the noncontact method for the material strength estimation [15–17] . This study reports on the broadband measurements of the frequency-dependent attenuation of the time-resolved laser induced ultrasound pulses in an HPT nickel sample.…”