The mean grain size determination of boron carbide (B4C)–aluminium (Al) and boron carbide (B4C)–nickel (Ni) composites by ultrasonic velocity technique

Evaluation of mean grain size using the multi-scale ultrasonic attenuation coefficient

“…Besides, this method generally works when the thickness of the blocks is not less than 6 mm. The ultrasonic velocity method evaluates mean grain size based on the discrepancy between the ultrasonic velocities caused by the difference between the elasticity moduli of grain boundary [8,9], but this method is less sensitive for some metals and has a relatively greater error on grain size evaluation [10]. Attenuation is a frequently used method currently, based on the difference of attenuation of acoustic energy when ultrasound propagates in materials of different mean grain sizes.…”

Radiation shielding effectiveness, structural, and mechanical properties of HDPE/B4C composites reinforced with Fe2O3-Al2O3-Al-Fe fillers

“…A representation of the incorporation of boron carabid (B 4 C) into the HDPE hosting matrix (C1) is shown in figure 3(b). According to the literature, some large and small particles resembling boron carabid appeared in the HDPE/B 4 C composite (C1), which changed the HDPE microstructure [62]. The composite of C1 shows small and large particles of B 4 C separated on the HDPE surface as the surface shows a high porosity.…”

Laser ultrasonic Evaluation of 316L Corrosion Resistance Based on the Influence of Grain Size

“…Metallographic method is a destructive method uesd to measure the mean grain size of materials commonly, although this method can get accurately test result, but it takes a lot of time to prepare the experimental samples, and the obtained microscopic image is local because the test observed in the local part. Ultrasonic testing is mainly used for non-destructive testing of materials, the grain size measurement using ultrasound depends on various properties including ultrasonic velocity [21] and attenuation [22].…”