Effect of aging treatment on microstructure and mechanical properties of Cu–Ag alloys

High-Entropy Alloys: A Critical Review

“…[20,73,[109][110][111][112][113][114][115][116][117][118][119][120][121] In both solutions, some HEAs show better corrosion properties than 304 SS and even 304L SS and have good resistance to pitting. [109,[115][116][117] Important factors include alloy composition and microstructure, particularly the amount and distribution of corrosion-resistant elements (such as Cr), and the presence of galvanic corrosion.…”

“…Addition of Cu to the CoCrFeNi alloy leads to the formation of Cu-rich interdendrite phase, which suffers from galvanic corrosion and severely degrades the corrosion resistance. [111,118] To make things worse, the passive film on the Curich interdendrite regions does not offer good protection, which further narrows down the passivation region. [111] The corrosion property can be improved by reducing the amount of Cu-rich phase via high-temperature annealing.…”

“…[111] The corrosion property can be improved by reducing the amount of Cu-rich phase via high-temperature annealing. [118] Addition of 0.5 mole fraction of Al to the CoCrFeNi alloy leads to the formation of (Al, Ni)-rich BCC phase and causes galvanic corrosion in NaCl solution. [73] Al is also detrimental to the corrosion resistance of the Al x CrFe 1.5 MnNi 0.5 alloys.…”

Strengthening Effect of Ag Precipitates in Cu–Ag Alloys: A Quantitative Approach

“…Discontinuous precipitation existed predominantly in Cu-6 wt.% Ag due to high-angle grain boundaries and continuous precipitation existed predominantly in Cu-24 wt.% Ag due to the net-like eutectic colonies surrounding Cu dendritic arms. [14] The precipitation process has been thoroughly investigated with electron microscopy. Rod-like Ag precipitates were observed to grow along the < 110 > direction and the habit planes were determined to be {111}.…”

“…[14,17,21] From the Cu-Ag binary phase diagram, the equilibrium solubility of Ag in Cu phase is about 2 wt.% at 450°C. [22] Therefore, three materials (Pure Cu, Cu-2 wt.% Ag and Cu-6 wt.% Ag) were selected and prepared by conventional casting method.…”