Developing Zn-1.5Mg Alloy with Simultaneous Improved Strength, Ductility and Suitable Biodegradability by Rolling at Room Temperature

doi:10.1007/s40195-023-01581-0

Abstract

Abstract:

This study systematically investigated the influence of the microstructure evolution, mechanical properties and corrosion behaviors on Zn-1.5Mg (wt%) alloy processed by room-temperature rolling. The as-cast Zn-1.5Mg alloy consists of η-Zn matrix and η-Zn + Mg₂Zn₁₁ eutectic structure. As rolling reduction increases, the average grain size of the alloy reduces from 42.9 to 1.7 μm, and the eutectic structure undergoes fragmentation and refinement, changing from a network distribution surrounding the matrix to a lamellar alternating distribution with the matrix. The ultimate tensile strength of the as-rolled alloy (80% reduction) is increased to 366 ± 3.7 MPa, along with a good elongation of 18.4% ± 2.0%. Immersion tests in Hanks’ solution indicate that the initial corrosion rate of the 80%-rolled alloy is 0.030 mm/year and finally stabilizes at 0.034 mm/year when the immersion duration is extended to 21 days. According to X-ray diffractometer and X-ray photoelectron spectroscopy analyses, Ca₃(PO₄)₂, CaCO₃, Ca(OH)₂, Zn₃(PO₄)₂, Zn(OH)₂, ZnO and a small amount of MgO and MgCO₃ are the main corrosion products on the surface. Due to the microstructure refinement, the developed alloy exhibits uniform corrosion, and the corrosion morphology is dominated by pitting pits.

Key words: Zn-1.5Mg alloy, Rolling, Microstructure, Mechanical properties, Corrosion behavior

Ziyue Xu, Huan Liu, Guangyang Hu, Xiaoru Zhuo, Kai Yan, Jia Ju, Wenkai Wang, Hang Teng, Jinghua Jiang, Jing Bai. Developing Zn-1.5Mg Alloy with Simultaneous Improved Strength, Ductility and Suitable Biodegradability by Rolling at Room Temperature[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(11): 1833-1843.

Figures/Tables 10

Fig. 1 Microstructures of the as-cast Zn-1.5Mg alloy: a OM, b SEM images

Fig. 2 BC maps a, d, g, IPF maps b, e, h and the corresponding grain size distributions c, f, i of as-rolled Zn-1.5Mg alloys at different reductions: a-c 55%, d-f 70%, g-i 80%

Fig. 3 Recrystallization distribution and area fraction of rolled Zn-1.5Mg alloy at different reductions: a 55%, b 70%, c 80%, d area fraction of recrystallization, substructure and deformation zone

Fig. 4 KAM micrographs of as-rolled Zn-1.5Mg alloy at different reductions: a 55%, b 70%, c 80%, d corresponding relative frequency

Fig. 5 Microhardness results of as-cast and as-rolled Zn-1.5Mg binary alloys

Fig. 6 a Typical engineering strain-stress curves of as-cast and as-rolled Zn-1.5Mg alloys. b Comparison of the mechanical properties of high-alloyed Zn-Mg alloys developed in this study and in references [12,29,30,32,34]

Fig. 7 Corrosion rate of 80%-rolled Zn-1.5Mg alloy calculated on weight loss value and comparison between this study and other processed Zn-Mg alloys [20]

Fig. 8 SEM micrographs of corrosion product morphology and XRD phase analysis results for 80%-rolled Zn-1.5Mg alloys after immersed in 37 °C Hanks’ solution for: a, b 7 days, c, d 14 days, e, f 21 days

Table 1 EDS analysis results of the positions marked in Fig. 8

Immersion period (day)	Position	Weight fraction (wt%)
Immersion period (day)	Position	Zn	Mg	C	O	P	Ca
7	A	86.03	4.59	3.99	2.76	1.68	0.95
14	B	51.02	1.62	11.03	10.96	15.22	10.15
14	C	85.18	0.97	4.62	3.15	3.53	2.55
21	D	30.76	1.38	7.46	35.88	12.50	12.01
21	E	68.96	1.62	6.02	15.35	4.33	3.71

Fig. 9 XRD phase analysis and XPS analysis results for 80%-rolled Zn-1.5Mg alloy after immersed in 37 °C Hanks’ solution for 21 days: a XRD, b XPS survey, c Zn 2p2/3, d Ca 2p, e Mg 1s

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