Evolution of Nanoporous Surface Layers on Gas-Atomized Ti60Cu39Au₁ Powders during Dealloying.

ABSTRACT: Nanoporous golf ball-shaped powders with a surface porous layer consisting of fcc Cu and Cu₃Au phases have been fabricated by selectively dissolving gas-atomized Ti60Cu39Au₁ powders in 0.13 M HF solution. The distribution profiles of the Ti₂Cu and TiCu intermetallic phases and powder size play an important role of the propagation of the selective corrosion frontiers. The final nanoporous structure has a bimodal characteristic with a finer nanoporous structure at the ridges, and rougher structure at the shallow pits. The powders with a size of 18⁻75 m dealloy faster due to their high crystallinity and larger powder size, and these with a powder size of smaller than 18 m tend to deepen uniformly. The formation of the Cu₃Au intermetallic phases and the finer nanoporous structure at the ridges

SUBMITTER: Dan Z 

PROVIDER: S-EPMC6116246 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature