Improvement of mechanical property and corrosion resistance of Mg-Zn-Nd alloy by bi-direction drawing

doi:10.1016/j.jmst.2020.11.060

Abstract

Abstract:

Mg-Zn-Nd alloy is a promising biodegradable metal material for surgical staples during the reconstruction of digestive tract due to its good biocompatibility and suitable mechanical properties. However, its deformation property and corrosion resistance should be improved to make better safety and effectiveness of staples. In the present study, bi-direction drawing was adopted to maintain the initial texture characteristics, and improve mechanical property and corrosion resistance of Mg-2Zn-0.5Nd alloy. The results showed that the microstructure after bi-direction did not change too much, but the texture could maintain its initial characteristics. The ductility of the alloy with 60 % accumulative area reduction after bi-direction drawing was increased by 70 %, indicating that an outstanding deformation property of Mg-Zn-Nd alloy can be obtained by bi-direction drawing. The corrosion resistance was also improved after bi-direction drawing compared with that under single direction drawing.

Key words: Bi-direction drawing, Texture, Mechanical property, Corrosion resistance

Ming Gao, Ke Yang, Lili Tan, Zheng Ma. Improvement of mechanical property and corrosion resistance of Mg-Zn-Nd alloy by bi-direction drawing[J]. J. Mater. Sci. Technol., 2021, 81: 88-96.

Figures/Tables 11

Fig. 1. The schematic diagram of single direction and bi-direction drawing process.

Fig. 2. Optical microstructures of ZN20 alloy after single direction drawing (a) and bi-direction drawing (b) with different accumulative AR (20 %: 1; 40 %: 2; 60 %: 3) and grain size distributions.

Fig. 3. EBSD results：band contrast map (a, c) and distribution of Schmid factor (b, d) for (0001) $<11\bar{2}0>$ basal slip of ZN20 alloy with 20 % accumulative AR after single direction drawing (a, b) and bi-direction drawing (c, d).

Fig. 4. SEM morphology of second phase distribution and magnified images of as-drawn ZN20 alloy with different accumulative AR after single direction drawing (a) and bi-direction drawing (b) with different accumulative AR (20 %: 1; 40 %: 2; 60 %: 3).

Table 1 EDS results of the region marked by red arrow in Fig. 4.

Position	At. / %
Position	Mg	Zn	Nd
A	29.8	70.2	0
B	65.2	26.9	7.9
C	67.4	27.8	4.8
D	35.26	64.74	0

Fig. 5. (0001) PF and IPF of as-drawn ZN20 alloy with different accumulative AR after single direction drawing and bi-direction drawing (ND: normal direction).

Fig. 6. Stress-strain curves (a) and tensile properties (b) of as-drawn ZN20 alloy with different accumulative AR after single direction drawing and bi-direction drawing.

Fig. 7. Fracture morphologies of as-drawn ZN20 alloy with different accumulative AR after single direction drawing (a) and bi-direction drawing (b) with different accumulative AR (20 %: 1; 40 %: 2; 60 %: 3).

Fig. 8. Corrosion rate of ZN20 alloy after single direction drawing and bi-direction drawing with different accumulative AR.

Fig. 9. Corrosion morphologies (1) and magnified images (2) of ZN20 alloy with different accumulative AR processed by single direction drawing and bi-direction drawing after 14 days immersion in simulated intestinal fluid (20 %-1: a; 40 %-1: b; 60 %-1:c; 20 %-2: d; 40 %-2: e; 60 %-2: f).

Fig. 10. TEM morphology of dislocations distribution in ZN20 alloy with different accumulative AR (20 %: a; 40 %: b; 60 %: c) after single direction drawing.

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