Acoustic emissions analysis of damage in amorphous and crystalline metal foams

Shape-memory NiTi foams produced by solid-state replication with NaF

“…Optimization of the HIP parameters or further sintering after the HIP process may increase the densification of the NiTi powders and eliminate these fine pores. For the former option, higher HIP pressure and/or higher HIP temperature (using higher-melting salts such as BaF 2 or SrF 2 which have been used successfully for replication of Zr-based foams [43,44]) could be used.…”

Non-destructive evaluation (NDE) of composites: use of acoustic emission (AE) techniques

“…The application of Eq. (21.1) to AE data is widespread in the study of micro-fractures in rock (Shiotani et al, 2001) and brittle material (Brothers et al, 2006).…”

Porous and Foamed Amorphous Metals

“…With this method, porosities in the range of 72-86% were demonstrated, with pore sizes in the range of 150-350 µm. [13][14][15][16] In 2006, a similar foam with lower porosity (36-41%) and larger pore size (approximately 500-1000 µm) was produced by Ren and Qiu from Zr 41.25 Ti 13.75 Cu 12.5 Ni 10 Be 22.5 using NaCl placeholders. 17,18 Images of several representative porous amorphous metals, produced using liquid-state methods, are shown in Figure 1.…”