A High-Strength and Biodegradable Zn-Mg Alloy with Refined Ternary Eutectic Structure Processed by ECAP

doi:10.1007/s40195-020-01027-x

Abstract

Abstract:

In this study, the microstructure, mechanical properties and corrosion behaviors of a Zn-1.6Mg (wt%) alloy during multi-pass rotary die equal channel angle pressing (RD-ECAP) processing at 150 °C were systematically investigated. The results indicated that a Zn + Mg₂Zn₁₁ + MgZn₂ ternary eutectic structure was formed in as-cast Zn-Mg alloy. After ECAP, the primary Zn matrix turned to fine dynamic recrystallization (DRX) grains, and the network-shaped eutectic structure was crushed into fine particles and blended with DRX grains. Owing to the refined microstructure, dispersed eutectic structure and dynamically precipitated precipitates, the 8p-ECAP alloy possessed the optimal mechanical properties with ultimate tensile strength of 474 MPa and elongation of 7%. Moreover, the electrochemical results showed that the ECAP alloys exhibited similar corrosion rates with that of as-cast alloys in simulated body fluid, which suggests that a high-strength Zn-Mg alloy was successfully developed without sacrifice of the corrosion resistance.

Key words: Zn-Mg alloy, Equal channel angular pressing, Eutectic structure, Mechanical property, Corrosion behavior

He Huang, Huan Liu, Li-Sha Wang, Yu-Hua Li, Solomon-Oshioke Agbedor, Jing Bai, Feng Xue, Jing-Hua Jiang. A High-Strength and Biodegradable Zn-Mg Alloy with Refined Ternary Eutectic Structure Processed by ECAP[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(9): 1191-1200.

Figures/Tables 11

Fig. 1 Schematic diagram of RD-ECAP processing

Fig. 2 XRD spectrum of as-cast Zn-1.6Mg sample. Inset is the enlargement of the marked rectangle region with 2θ angle between 40° and 45°

Fig. 3 Microstructures of as-cast alloy: a optical image; b SEM image; EDS results of c A area, d B area marked in b; e low-magnification, f high-magnification TEM images of the eutectic structure and insets of f are the corresponding SAED patterns of second phase within eutectic structure and the EDS result of nanocrystalline particles

Fig. 4 SEM microstructures of Zn-Mg alloys after a four passes, b eight passes of ECAP processing

Fig. 5 EBSD analysis results of ECAP alloys: inverse pore figure maps of a 4p, b 8p alloys; c recrystallization distribution; d Schmid factor distribution; inverse pore figure textures of e 4p, f 8p alloys

Fig. 6 TEM images of eutectic structure in a 4p-, b 8p-ECAP alloys, c the DRX grains in primary Zn matrix, d dynamic precipitates within Zn grains in eutectic regions。。

Fig. 7 a Typical tensile engineering stress-strain curves of Zn-1.6Mg alloys in this study, b comparison of mechanical properties with developed Zn-Mg alloys [17, 24, 35, 42]

Fig. 8 Potentiodynamic polarization (PDP) curves of Zn-1.6Mg alloys

Table 1 Electrochemical parameters of potentiodynamic polarization calculated by cathodic Tafel extrapolation

Sample conditions	Corrosion potential E_corr (V_{vs. SCE})	Current density i_corr (A/cm²)	Corrosion rate (mm/year)
As-cast	- 1.25 ± 0.01	(6.42 ± 0.31) × 10^-6	8.71 ± 4.25 × 10^-2
4p-ECAP	- 1.20 ± 0.01	(7.33 ± 0.49) × 10^-6	9.95 ± 6.71 × 10^-2
8p-ECAP	- 1.20 ± 0.02	(6.91 ± 0.31) × 10^-6	9.37 ± 4.25 × 10^-2

Fig. 9 SEM images of corrosion morphologies on the surface of Zn-1.6Mg alloys after electrochemical test: a as-cast, b 4p-ECAP, c 8p-ECAP

Table 2 EDS results of selected areas in Fig. 8

Area	Elements (wt%)
Area	C	O	Mg	P	Ca	Zn
A	7.15	5.33	2.16	0.41	0.26	84.49
B	10.05	16.24	0.18	0.30	0.28	72.95
C	7.54	5.40	0.81	0.52	0.26	85.47
D	7.50	23.92	1.55	1.98	1.43	63.62
E	6.50	4.79	2.95	0.14	0.23	85.40
F	8.94	19.07	0.46	0.14	0.58	70.81

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