Mechanical Properties and Degradation Behavior of Hot-Extruded Zn-2Cu-0.5Zr Alloy
Received date: 2020-12-31
Revised date: 2021-03-06
Online published: 2021-05-17
Supported by
National Key Research and Development Program of China(2016YFC1102500);Science and Technology Program of Sichuan Province(2020YFH0077)
Zinc possesses a moderate degradation rate compared to magnesium and iron. Accordingly, it has been studied as a biodegradable metal in recent years. However, its mechanical properties barely meet the clinical requirements of implant applications. Moreover, the non-uniform corrosion mode of zinc can result in the premature mechanical failure of the implants. In the present study, a hot-extruded Zn-2Cu-0.5Zr (mass fraction, %) alloy was fabricated with improved mechanical properties and degradation behavior suitable for implant use. The microstructure of the Zn-2Cu-0.5Zr alloy was composed of a Zn matrix, CuZn5 phase, and Zn22Zr phase. Owing to the evenly distributed second phase particles and refined grain size, the yield strength, ultimate tensile strength, and elongation of the hot-extruded Zn-2Cu-0.5Zr alloy were improved to 192 MPa, 213 MPa, and 61%, respectively, which were significantly higher than those of Zn and Zn-2Cu alloy. Furthermore, the refined grains also rendered a more uniform degradation mode to the Zn matrix than Zn and Zn-2Cu alloy. In conclusion, the hot-extruded Zn-2Cu-0.5Zr alloy may find promising applications in implants.
Gang SHEN , Wentai ZHANG , Chao ZHOU , Huanzhong JI , En LUO , Haijun ZHANG , Guojiang WAN . Mechanical Properties and Degradation Behavior of Hot-Extruded Zn-2Cu-0.5Zr Alloy[J]. Acta Metall Sin, 2022 , 58(6) : 781 -791 . DOI: 10.11900/0412.1961.2020.00537
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