The effects of heat treatment and zirconium on the corrosion behaviour of Mg–3Nd–0.2Zn–0.4Zr (wt.%) alloy

Identification of NdH2 particles in solution-treated Mg–2.5%Nd (wt.%) alloy

“…The formation mechanism needs further research. But, it is obvious that the NdH 2 particles have damage to the Mg-Nd alloy, such as the decrease in corrosion resistance [7]. Synchronously, it can be deduced that the generation of NdH 2 phase will consume certain Nd atoms in melt and decrease its peak-aged hardness, which would probably limit their engineering application.…”

“…Zheng et al [6] found that there were GdH 2 phases in the microstructure of solution-treatment GN82K alloy heated at 788 K for 4 h. They attributed the hydride formation to the inward diffusion of hydrogen generated by moisture breakdown at the surface of specimen. Chang et al [7] found that the microstructure of solution-treatment Mg-3%Nd-0.2%Zn alloy by gravity cast was composed of a few fine neodymium-rich phase and ␣-Mg matrix. The neodymium-rich phase acted as a microgalvanic cathode to accelerate the corrosion of matrix.…”

Effect of isothermal aging on the microstructure and properties of as-cast Mg–Gd–Y–Zr alloy

“…The polarization started from a cathodic potential of −250 mV relative to E OC with a scan rate of 1 mV/s. More details of the experimental procedures are described elsewhere [19][20][21][22][23]. To guarantee the validity of the experimental data, all tests were done for each material at least two times in 5% NaCl solutions at 25 ± 2 • C. Those aged at 225 • C showed a considerably lower peak hardness after 80 h aging but the hardness subsequently dropped rapidly upon further aging.…”

“…Chang and co-workers [19][20][21] have studied the effects of Gd, Zr, Nd and other elements on the corrosion resistance of peak-aged Mg-Gd-Y alloys, but they used only one aging temperature. However, as the aging responses are quite diverse when Mg-Gd-Y alloys are isothermally aged at various temperatures, we should consider that the corrosion resistance of Mg-Gd-Y alloys may be different when aged at various temperatures, especially for peak-aged alloys working in corrosion environment.…”

Research on Laser Welding of Mg-Rare Earth Alloy Mg-3Nd-0.2Zn-0.4Zr

“…A new Mg-rare earth alloy NZ30K alloyed with the rare earth element neodymium (Nd) has been developed, researchers have investigated the microstructure and mechanical properties as well as the corrosion behaviors of NZ30K alloy ( Ref 6,7). It can be used as components in transportation system, parts in the car, and bracket of car engines (Ref 8).…”