Effects of ytterbium addition and heat treatment on the mechanical properties and biocorrosion behaviors of Mg–Zn–Zr alloy

The Influence of Rapid Solidification on Corrosion Behavior of Mg60Zn20Yb15.7Ca2.6Sr1.7 Alloy for Medical Applications

“…The average value for 10 measurements was 297 ± 4 HV. The obtained value of microhardness for the studied alloy is much higher, compared with the Mg-based alloys with ytterbium addition presented in the work [ 18 ]. In the studies of Li et al [ 18 ], the microhardness values obtained under the load of 9.8 N for the Mg 5.8 Zn 0.5 Zr x Yb (x = 0, 1.0, and 2.0) alloys were not higher than 81 HV.…”

“…The obtained value of microhardness for the studied alloy is much higher, compared with the Mg-based alloys with ytterbium addition presented in the work [ 18 ]. In the studies of Li et al [ 18 ], the microhardness values obtained under the load of 9.8 N for the Mg 5.8 Zn 0.5 Zr x Yb (x = 0, 1.0, and 2.0) alloys were not higher than 81 HV. It should be mentioned that in the other works, the microhardness values measured with the same load conditions as in our studies were lower, compared with the studied alloy, and equaled 57 ÷ 58 HV for AZ91D [ 33 ], 46 ± 1 HV for Mg-0.6Ca, 47 HV for Mg-1Ca [ 33 ], and Mg-0.5Ca-0.3Zn alloys [ 34 ].…”

“…In both cases, with an increase in Yb content, the corrosion resistance was improved. In the Mg alloys with ytterbium, a higher corrosion potential was observed in combination with a lower corrosion current density and pH value [ 18 ]. Yamasaki et al [ 19 ] investigated the Mg-Zn-Yb and Mg-Zn-La alloy ribbons in 1% NaCl solution to determine the optimum composition of corrosion-resistant Mg alloys.…”

“…Strontium, similar to calcium, is incorporated at a similar rate into bone cells (increasing their density), thereby preventing the development of osteopenia and osteoporosis [16,17]. Ytterbium, a rare earth element, has an effect on refining the microstructure and improvement in the corrosion resistance of Mg alloys [18,19]. In the literature, there is no information on the optimal content of Yb in Mg alloys from the corrosion point of view, although the solubility limit of Yb in Mg-based alloys is 4.8% at 400 • C. Li et al [18] studied biocorrosion behavior and mechanical properties of ZK60 alloy with 0, 1, and 2 Yb wt.%.…”

“…Ytterbium, a rare earth element, has an effect on refining the microstructure and improvement in the corrosion resistance of Mg alloys [18,19]. In the literature, there is no information on the optimal content of Yb in Mg alloys from the corrosion point of view, although the solubility limit of Yb in Mg-based alloys is 4.8% at 400 • C. Li et al [18] studied biocorrosion behavior and mechanical properties of ZK60 alloy with 0, 1, and 2 Yb wt.%. They argued that by increasing the ytterbium content, the grain size was decreased.…”