Dependency of the corrosion properties of in-situ Ti-based BMG matrix composites with the volume fraction of crystalline phase
- Dependency of the corrosion properties of in-situ Ti-based BMG matrix composites with the volume fraction of crystalline phase
- Mukta Rani Debnath; 김도향; 에릭플러리
- composites; metallic glasses; corrosion; corrosion behavior
- Issue Date
- VOL 22, 255-259
- The chemical and electrochemical corrosion properties of in-situ Ti45(Zr-Be-Cu-Ni)55-xNbx BMG matrix
composites, with x = 0, 5, 10, 15 at.% and containing different volume fractions of crystalline β-(Ti,Zr,Nb)
phase, have been investigated in a hydrogenated 1 M H2SO4 + 2 ppm F- electrolyte at 80 ℃. In
comparison to monolithic Ti-based BMGs and Tie6Ale4V alloy, the in-situ BMG matrix composite with
~20% volume fraction of β-(Ti,Zr,Nb) phase exhibits a high corrosion resistance characterized by a low
value of corrosion current density, a stable passivation behavior in both potentiodynamic and potentiostatic
polarization and low weight loss during immersion tests. The enhancement of the corrosion
resistance is attributed to Ti-, Zr- and Nb-rich oxide layers produced on top of both the dendrite and
amorphous matrix. However, for the BMG composite with a large (~41.5%) volume fraction of Nb-rich
dendrites the corrosion resistance was reduced leading to the dissolution of the amorphous matrix
during immersion tests.
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