Mechanical properties and stress corrosion cracking behavior of a novel Mg-6Zn-1Y-0.5Cu-0.5Zr alloy

The corrosion behaviour of a novel Mg–Zn–Zr–Y–Cu alloy

“…It is evident that, for ZK60 alloy, very coarse unDRXed regions (19.65 μm) and fine DRXed grains (1.67 μm) are elongated along the extrusion streamline, as shown in Figure 1(a,b). While for ZWCK6100 alloy, the sizes of unDRXed regions (4.72 μm) and DRXed grains (0.95 μm) are much refined, as shown in Figure 1(c,d), and the grain refinement is not caused by the ascast microstructure, which has been confirmed in our previous study [25]. It can be concluded that the combined additions of Y and Cu can simultaneously achieve grain refinement and microstructural homogeneity.…”

“…These second phases formed in ZWCK6100 alloy with combined addition of Cu and Y, such as CuMgZn and I (Mg 3 Zn 6 Y) phases, are nobler than α-Mg matrix [16] and will act as cathodes and accelerate the corrosion rate. The volume fraction of CuMnZn phase is very low, because the addition amount of Cu is 0.5 wt-%, combustion loss is inevitable in the smelting process, and some Cu atoms replace Mg atoms in I phase [25]. Therefore, the effect of CuMnZn phase on the corrosion resistance of ZWCK6100 alloy is limited.…”

“…The detailed procedure of material preparation can refer to Ref. [25]. Mg-6Zn-0.5Zr alloy bar (named ZK60) was fabricated by the same process.…”

“…Thus, a novel Mg–6Zn–1Y–0.5Cu–0.5Zr alloy (wt-%) with combined addition of Y and Cu was fabricated, and its microstructure and mechanical properties were studied in our previous study [25]. Results revealed that this novel Mg alloy exhibited excellent strength (tensile strength ( σ b ) was 351.3 MPa and yield strength ( σ s ) 320.3 MPa) and ductility ( ϵ f was up to 19.8%), and the mechanical properties would be further optimised by heat treatment.…”

Electrochemical Performance and Hydrogen Storage of Ni–Pd–P–B Glassy Alloy

“…The unreacted metal surface acts as a passive-like film: that is, the result of a purely porous metallic film. This mechanism consistently creates layers, with diminutive fracture toughness, that have severely modified mechanical properties, causing many stress-corrosion cracking processes in alloys [ 36 , 37 , 38 , 39 , 40 ]. Dealloying was first established to deliver porous nickel, which is used as a catalyst in several chemical activities [ 41 , 42 , 43 , 44 ].…”