Formation of supersaturated solid solutions by mechanical alloying

Structural evolution of Al/BN mixture during mechanical alloying

“…After having been milled for 6 h, only a broadened weak (0 0 2) peak for BN can be seen and it disappeared completely after milling for 18 h. Although the intensity of the diffraction peaks of aluminum decreased gradually with increasing milling time, it was not so acute as that of BN. Except from aluminum and BN, no additional diffraction peaks were observed even for the sample milled for 48 h. This phenomenon is similar to those observed in some systems during MA, such as Ti-C [13], Ni-Al [14], Fe-Si and W-C in our previous works. The gradual broadening and subsequent absence of BN diffraction peaks with increasing milling time revealed that the grain of BN was refined and some of the BN might decompose into boron and nitrogen atoms.…”

Characterization of nanocrystalline CoCrFeNiTiAl high-entropy solid solution processed by mechanical alloying

“…Alloying occurs as the grain size is refined down to nanometer range and thus a substantial amount of enthalpy can be stored in nanocrystal alloys due to the large grain boundary area. The energy stored in the grain boundaries serves as the driving force for the formation of solid solution [19,22]. The solid solubility is expected to extend among the multiple components with milling time increasing until it reaches a supersaturated level, after which no further extension of solid solubility will be achieved [6].…”

Nanocrystalline CoCrFeNiCuAl high-entropy solid solution synthesized by mechanical alloying

“…As the milling time increasing, the grain boundary fraction and mechanical deformation is continuously increased due to the decreased grain size. The increase in lattice strain may also due to the increasing dislocation density produced by severe plastic deformation [16].…”