Mechanical Properties and Degradation Behavior of Hot-Extruded Zn-2Cu-0.5Zr Alloy

doi:10.11900/0412.1961.2020.00537

Acta Metall Sin

2022, Vol. 58

Issue (6): 781-791 DOI: 10.11900/0412.1961.2020.00537

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Mechanical Properties and Degradation Behavior of Hot-Extruded Zn-2Cu-0.5Zr Alloy

SHEN Gang¹, ZHANG Wentai¹, ZHOU Chao², JI Huanzhong³, LUO En³, ZHANG Haijun⁴(

), WAN Guojiang¹(

)

^1.Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
^2.Beijing Advanced Innovation Center for Materials Genome Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
^3.West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
^4.The Tenth People's Hospital of Shanghai, Tongji University, Shanghai 200072, China

Cite this article:

SHEN Gang, ZHANG Wentai, ZHOU Chao, JI Huanzhong, LUO En, ZHANG Haijun, WAN Guojiang. Mechanical Properties and Degradation Behavior of Hot-Extruded Zn-2Cu-0.5Zr Alloy. Acta Metall Sin, 2022, 58(6): 781-791.

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Abstract

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.

Key words: biodegradable Zn-based alloy microstructure mechanical property degradation behavior

Received: 31 December 2020

ZTFLH:

TG146.1

Fund: National Key Research and Development Program of China(2016YFC1102500);Science and Technology Program of Sichuan Province(2020YFH0077)

About author: WAN Guojiang, professor, Tel: (028)87600723, E-mail: guojiang.wan@home.swjtu.edu.cnZHANG Haijun, professor, Tel: (021)66300588, E-mail: zhanghaijun@tongji.edu.cn

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	Gang SHEN
	Wentai ZHANG
	Chao ZHOU
	Huanzhong JI
	En LUO
	Haijun ZHANG
	Guojiang WAN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00537 OR https://www.ams.org.cn/EN/Y2022/V58/I6/781

Fig.1 OM (a-c) and SEM (d-f) images of hot-extruded Zn (a, d), Zn-2Cu (b, e), and Zn-2Cu-0.5Zr (c, f) alloys (Insets in Figs.1d-f show the high magnified images)

Fig.2 XRD spectra of the hot-extruded Zn, Zn-2Cu, and Zn-2Cu-0.5Zr alloys

Fig.3 Mechanical properties of the hot-extruded Zn, Zn-2Cu, and Zn-2Cu-0.5Zr alloys
(a) representative stress-strain curves
(b) calculated yield strength (YS), ultimate tensile strength (UTS) and elongation at fracture

Fig.4 Potentiodynamic polarization (PDP) curves (a), Nyquist diagrams (b), Bode-impedance diagrams (c), and Bode-phase angle diagrams (d) of the hot-extruded Zn, Zn-2Cu, and Zn-2Cu-0.5Zr alloys in Hank's solution at (37 ± 0.5)^oC (E_corr—corrosion potential, i_corr—corrosion current density, i—galvanic current density, Z"—imaginary part of impedance, Z'—real part of impedance, |Z|—impedance modulus)

Table 1 Fitting results of PDP curve and electrochemical impedance spectrum (EIS) data

Fig.5 Equivalent circuit of EIS plots

Fig.6 Low (a-c) and locally high (d-f) magnified surface morphologies of hot-extruded Zn immersed in Hank's solution at (37 ± 0.5)^oC for 7 d (a, d), 14 d (b, e), and 28 d (c, f)

Fig.7 Low (a-c) and locally high (d-f) magnified surface morphologies of hot-extruded Zn-2Cu alloy immersed in Hank's solution at (37 ± 0.5)^oC for 7 d (a, d), 14 d (b, e), and 28 d (c, f)

Fig.8 Low (a-c) and locally high (d-f) magnified surface morphologies of hot-extruded Zn-2Cu-0.5Zr alloy immersed in Hank's solution at (37 ± 0.5)^oC for 7 d (a, d), 14 d (b, e), and 28 d (c, f)

Fig.9 Surface morphologies of hot-extruded Zn (a, d, g), Zn-2Cu (b, e, h), and Zn-2Cu-0.5Zr (c, f, i) alloys immersed in Hank's solution at (37 ± 0.5)^oC for 7 d (a-c), 14 d (d-f), and 28 d (g-i) after removal of corrosion products, and locally high magnified SEM images of Figs.9g-i (j-l)

Fig.10 Corrosion rates calculated from weight loss of hot-extruded Zn, Zn-2Cu, and Zn-2Cu-0.5Zr alloys after immersion in Hank's solution at (37 ± 0.5)^oC for different time

Fig.11 Schematic of the improvement mechanisms for the enhanced mechanical properties and degradation behavior of hot-extruded Zn-2Cu-0.5Zr alloy

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