Effect of eutectic Si on surface nanocrystallization of Al–Si alloys by surface mechanical attrition treatment

Aluminizing a Ni sheet through severe plastic deformation induced by ball collisions

“…However, the microhardness value reported in ref. [48] was around 130, a value that is three times lower than what was observed in our case (Fig. 2d).…”

“…6b and 8b). The formation of nanocrystalline grains in the Al layer was related to the dislocation activity (as was also the case for the Ni sheet) [48]. The differences in the grain sizes of Ni and Al were attributed to the higher plastic deformation and higher strain rates at the surface (relative to areas further from surface) and to the different responses to deformation of Ni and Al [18,40].…”

“…The differences in the grain sizes of Ni and Al were attributed to the higher plastic deformation and higher strain rates at the surface (relative to areas further from surface) and to the different responses to deformation of Ni and Al [18,40]. Furthermore, the presence of Ni fragments in the Al matrix could promote dislocation generation (Table 1) and significantly contribute to further refining of the Al [48].…”

“…For example, in ref. [48], Al alloys were subjected to surface nanocrystallization through ball collisions. After processing of the Al-Si alloy, small Si particles were dispersed in the Al matrix.…”

Effects of Warm Laser Peening on Thermal Stability and High Temperature Mechanical Properties of A356 Alloy

“…In addition, the Si particles on the surface were significantly refined and balled. Chang [14,15] investigated the mechanical properties and thermal stability of A356 alloy treated by surface alloying technology. The results showed that a nano-grain structure was discovered in the treated area after 60 min, the size of which was about 18 nm.…”