Acta Metallurgica Sinica (English Letters) ›› 2023, Vol. 36 ›› Issue (2): 295-309.DOI: 10.1007/s40195-022-01464-w

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Effect of Ag Addition on Microstructure, Mechanical and Corrosion Properties of Mg-Nd-Zn-Zr Alloy for Orthopedic Application

Yu-Jin Nie1,2, Jian-Wei Dai1,2, Xiao-Bo Zhang1,2()   

  1. 1School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, China
    2Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology, Nanjing, 211167, China

Abstract:

The as-extruded Mg–3Nd–0.2Zn–0.4Zr–xAg (x = 0, 0.2, 0.5, 1 wt%) alloys were prepared for biomedical applications. Scanning electron microscope, electron backscattered diffraction, X-ray diffraction, tensile test machine, electrochemical workstation, and immersion experiments were used to study microstructures, mechanical properties, and corrosion behavior of the as-extruded alloys. The results indicate that the microstructures of all the as-extruded alloys are composed of coarse undynamic recrystallized grains, fine equiaxed recrystallized grains, and precipitated phases. Ag element plays a positive role in promoting dynamic recrystallization and grain refinement. And during the extrusion, all the four alloys generate a $\left\langle {10\overline{1}0} \right\rangle$//ED fiber texture. With the increase of Ag element, the volume fraction of Mg12Nd phase increases and then decreases slightly. By increasing Ag addition, both yield strength and ultimate tensile strength of the as-extruded alloys reduce first and then improve, and the elongation improves gradually from 9.4 to 12.7%. More importantly, the addition of Ag accelerates corrosion of the as-extruded alloys in simulated body fluid, and all the as-extruded alloys show uniform corrosion mode.

Key words: Magnesium alloy, Hot extrusion, Mechanical properties, Corrosion resistance