Abstract
The Mg95.34Gd2.66Cu2 alloy containing profuse solute segregation stacking faults (SFs) phase was prepared through solution treatment and furnace cooling, and its effect on corrosion behavior and corrosion mechanism were investigated. After heat treatment, the microstructure distribution of continuous bulk-shaped Mg5(GdCu) phase at grain boundaries and profuse solute segregation SFs phases in the matrix was realized. Compared with the as-cast alloy without SFs phase, the corrosion morphology exhibited that the galvanic corrosion expanded rapidly along the length direction of SFs phase after heat treatment. The Mg95.34Gd2.66Cu2 alloy heat treated at 420 °C exhibited the optimal comprehensive performance, with the ultimate compressive strength (UCS), compressive yield strength (CYS) and degradation rate of 437 MPa, 291 MPa, 56.5 mg/(cm2·h), respectively. And the degradation rate increased by 40% compared with the as-cast alloy.
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