Mechanical Properties and Corrosion Behavior of Biodegradable Mg–0.5Zr–0.5Ca–xZn Magnesium Alloys

Abstract

Mechanical properties and in vitro corrosion behavior of biodegradable Mg–0.5Zr–0.5Ca–xZn alloys in the simulated body fluid (SBF) solution are investigated. Zinc addition leads to a remarkable grain refinement in the as‐cast condition, as well as the formation of Ca2Mg6Zn3 and Mg7Zn3 compounds. As a result, the lean Mg–0.5Zr–0.5Ca–1Zn alloy shows the best combination of mechanical properties with an ultimate tensile strength (UTS) of 182 MPa, total elongation of 9.5%, and tensile toughness of 13 MJ m−3, which reveals ≈80%, 72%, and 190% improvements compared to those obtained for the Mg–0.5Zr–0.5Ca alloy, respectively. This sample also exhibits improved corrosion behavior, where a decrease in the corrosion current density (iCorr) is recorded via the addition of 1 wt% Zn. However, higher Zn additions result in the formation of a quasi‐continuous eutectic network with the consequent deterioration of tensile properties and increased effect of microgalvanic couples. The extreme grain refinement induced by the dynamic recrystallization (DRX) remarkably improves the overall mechanical properties of the hot extruded alloy but increased the iCorr. Accordingly, the properties of Mg–0.5Zr–0.5Ca alloys can be tailored for biomedical applications via Zn addition and thermomechanical processing.

Effect of Extrusion on Mechanical Property, Corrosion Behavior, and In Vitro Biocompatibility of the As-Cast Mg-Zn-Y-Sr Alloy

“…Based on this principle, Zn is widely used in Mg materials. Numerous studies [ 12 , 13 , 14 , 15 ] have found that Zn can simultaneously improve mechanical properties and corrosion resistance. Hence, Mg-Zn alloys have attracted great interest from many researchers.…”

High‐Throughput Evaluation of Hardening Coefficients of Eight Alloying Elements in Magnesium

“…[7][8][9] Studies have been performed by various groups around the world to improve the mechanical properties of Mg-based alloys to expand their applications by alloying additions. [10][11][12][13][14][15][16] For example, Ghorbani et al designed the Mg-0.5Zr-0.5Ca-1Zn alloy, exhibiting significant improvement in the ultimate tensile strength, elongation, tensile toughness, and corrosion resistance in comparison with the Mg-0.5Zr-0.5Ca alloy. [10] The Mg-10Li-3Al-2.8Zn alloy was reported to have superior yield strength of 321 MPa and ultimate tensile strength of 346 MPa by Wang et al, [15] after undergoing cold rolling, annealing, and water quenching.…”

“…[10][11][12][13][14][15][16] For example, Ghorbani et al designed the Mg-0.5Zr-0.5Ca-1Zn alloy, exhibiting significant improvement in the ultimate tensile strength, elongation, tensile toughness, and corrosion resistance in comparison with the Mg-0.5Zr-0.5Ca alloy. [10] The Mg-10Li-3Al-2.8Zn alloy was reported to have superior yield strength of 321 MPa and ultimate tensile strength of 346 MPa by Wang et al, [15] after undergoing cold rolling, annealing, and water quenching. These authors further investigated the strengthening mechanism for this alloy and found the solution strengthening to be the most important contributor.…”