Effect of Ca and Ag Content on Microstructure and Properties of Biodegradable Alloy Zn-Li-Ca-Ag

doi:10.11901/1005.3093.2022.582

Chinese Journal of Materials Research

2024, Vol. 38

Issue (3): 177-186 DOI: 10.11901/1005.3093.2022.582

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Effect of Ca and Ag Content on Microstructure and Properties of Biodegradable Alloy Zn-Li-Ca-Ag

YAN Junzhu¹^,², GAO Ming², YU Xiaoming¹, TAN Lili²(

)

^1.College of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China
^2.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

YAN Junzhu, GAO Ming, YU Xiaoming, TAN Lili. Effect of Ca and Ag Content on Microstructure and Properties of Biodegradable Alloy Zn-Li-Ca-Ag. Chinese Journal of Materials Research, 2024, 38(3): 177-186.

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Abstract

Due to the suitable degradation rate and good biocompatibility, Zn-alloys have great potential as biomedical degradable materials. However, the low mechanical properties of pure Zn limit its development as a biomedical material. In this paper, the known degradable Zn-Li-Ca-Ag alloy was further alloyed with different amount of Ca and Ag. The microstructure, mechanical properties and corrosion resistance of the prepared Zn-Li-Ca-Ag alloys were characterized by means of optical microscopy (OM), scanning electron microscopy (SEM), universal testing machine and electrochemical tests. The results showed that the microstructure of the Zn-Li-Ca-Ag alloy was composed of dendrites. The Ca addition can improve the strength of the Zn alloy by second-phase strengthening, and the Ag addition has a positive influence on the plasticity of the Zn alloy by refining the size of the dendrites. Ca has stronger influence on the enhancement of the alloy strength rather than Ag, and amoung others, the Zn-0.8Li-0.1Ca-0.2Ag alloy exhibits the highest tensile strength (186 MPa). The co-addition of Ca and Ag can also improve the corrosion resistance of Zn alloy.

Key words: biomaterials zinc alloy mechanical properties corrosion resistance

Received: 03 November 2022

ZTFLH:

TG146

Fund: National Key R&D Program(2020YFC1107501);National Natural Science Foundation of China(51971222);STS Project(20201600200042);Dongguan Innovative Research Team Program, Basic Applied Research Program of Liaoning Province(2022020347-JH2/1013)

Corresponding Authors: TAN Lili, Tel:(024)23971059, E-mail: lltan@imr.ac.cn

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	YAN Junzhu
	GAO Ming
	YU Xiaoming
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https://www.cjmr.org/EN/10.11901/1005.3093.2022.582 OR https://www.cjmr.org/EN/Y2024/V38/I3/177

Table 1 Chemical composition of Zn-Li-Ca-Ag alloy (massfraction, %)

Table 2 Chemical composition of Hank's solution

Fig.1 Microstructure of cast Zn-0.8Li-xCa-0.2Ag and Zn-0.8Li-0.05Ca-xAg alloys (a) 0, (b) 0.05, (c) 0.1, (d) 0, (e) 0.5, (f) 1

Fig.2 Second phase distribution of as-cast Zn-0.8Li-xCa-0.2Ag and Zn-0.8Li-0.05Ca-xAg alloys (a) 0, (b) 0.05, (c) 0.1, (d) 0,(e) 0.5, (f) 1

Table 3 EDS results of the positions marked in Fig.2

Fig.3 Microhardness of as cast Zn-0.8Li-xCa-0.2Ag alloy and Zn-0.8Li-0.05Ca-xAg alloy

Fig.4 Stress-strain curves (a, b) and room temperature tensile mechanical properties (c) of as cast Zn-0.8LixCa-0.2Ag alloys (x = 0, 0.05, 0.1, mass fraction, %) (a) and Zn-0.8Li-0.05Ca-xAg alloys (x = 0, 0.05, 0.1, mass fraction, %) (b)

Fig.5 Fracture morphology of as cast Zn-0.8Li-xCa-0.2Ag and Zn-0.8Li-0.05Ca-xAg alloys (a) 0, (b) 0.05, (c) 0.1, (d) 0, (e)0.5, (f) 1

Fig.6 Variation of pH value (a, b) and corrosion rate (c) of as cast Zn-0.8Li-xCa-0.2Ag alloy (x = 0, 0.05, 0.1%) (a) and Zn-0.8Li-0.05Ca-xAg alloy (x = 0, 0.05, 0.1%) (b) after immersion in Hank's solution for 21 d

Fig.7 Corrosion products morphology of as cast Zn-0.8Li-xCa-0.2Ag and Zn-0.8Li-0.05Ca-xAg alloys after 7 d of immersion in Hank's solution (a) 0, (b) 0.05, (c) 0.1, (d) 0, (e) 0.5, (f) 1

Table 4 EDS results of the positions marked in Fig.7

Fig.8 XRD patterns of corrosion products of cast Zn-0.8Li-xCa-0.2Ag and Zn-0.8Li-0.05Ca-xAg alloys after 7 d of immersion in Hank's solution

Fig.9 Corrosion morphologies of as cast Zn-0.8Li-xCa-0.2Ag and Zn-0.8Li-0.05Ca-xAg alloys immersed in Hank's solution for 21 d after removing corrosion products (a) 0, (b) 0.05, (c) 0.1, (d) 0, (e) 0.5, (f) 1

Fig.10 Potential polarization curves (a, b), Nyquist curves and equivalent fitting circuit of Zn-0.8Li-xCa-0.2Ag (x = 0, 0.05, 0.1, masss fraction, %) alloy (c) and Zn-0.8Li-0.05Ca-xAg alloy (x = 0, 0.5, 1, masss fraction, %) (d)

Table 5 Electrochemical corrosion parameters of the alloy in Hank's solution

Fig.11 Schematic illustration of the corrosion mechanism of Zn-0.8Li-xCa-0.2Ag (a) and Zn-0.8Li-0.05Ca-xAg (b) alloys in Hank's solution

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