Modification of Mn on corrosion and mechanical behavior of biodegradable Mg88Y4Zn2Li5 alloy with long-period stacking ordered structure

doi:10.1016/j.jmst.2019.09.038

Abstract

Abstract:

The biological corrosion behavior and mechanical properties of Mg_89-_xY₄Zn₂Li₅Mn_x (x = 0, 0.5, 1, 1.5 and 2 at.%) alloy with long-period stacking ordered (LPSO) structure were investigated in this work. The magnesium matrix and the eutectic phase of Mg₈₈Y₄Zn₂Li₅Mn₁ alloy are effectively refined by the grain boundary segregation of Mn, and the average size of matrix and the eutectic phase decreased by 66 % and 74 %, respectively. The ultimate tensile strength (UTS) and elongation enhanced by 36 % and 55 %, respectively. The corrosion rates obtained by weight loss and hydrogen evolution of Mg₈₈Y₄Zn₂Li₅Mn₁ alloy were 79 % and 84 % lower than that of Mg₈₈Y₄Zn₂Li₅ alloy. Additionally, Mg₈₈Y₄Zn₂Li₅Mn₁ alloy also presents superior corrosion behavior in electrochemical test. It is verified that Mn plays a positive role in both corrosion and mechanical properties of the Mg₈₈Y₄Zn₂Li₅Mn₁ alloy, which provides a reference for further experimental work.

Key words: Magnesium alloy, LPSO, Corrosion, Mechanical behavior, EIS

Jiaxin Zhang, Jinshan Zhang, Fuyin Han, Wei Liu, Longlong Zhang, Rui Zhao, Chunxiang Xu, Jing Dou. Modification of Mn on corrosion and mechanical behavior of biodegradable Mg₈₈Y₄Zn₂Li₅ alloy with long-period stacking ordered structure[J]. J. Mater. Sci. Technol., 2020, 42: 130-142.

Figures/Tables 22

Table 1 Chemical compositions of Mg89-xY4Zn2Li5Mnx (x = 0, 0.5, 1, 1.5 and 2) alloys.

Alloy	wt%					ppm
	Mg	Zn	Y	Li	Mn	Fe	Si	C
M0	Balance	4.85	13.11	1.19	0.09	152	71	8
M0.5	Balance	4.93	12.89	1.07	1.09	121	63	17
M1	Balance	4.79	13.08	1.14	1.98	109	115	21
M1.5	Balance	4.66	13.13	1.01	2.19	118	157	9
M2	Balance	4.91	12.77	1.21	2.33	126	188	15

Fig. 1. Shape and dimension of sample for tensile test.

Fig. 2. (a-e) Microstructures of (a) M0 alloy, (b) M0.5 alloy, (c) M1 alloy, (d) M1.5 alloy, (e) M2 alloy and (f) curve of mean grain size.

Fig. 3. (a) BF image, corresponding SAED patterns of 18R LPSO structure in M1 alloy and (b) BF image, corresponding SAED patterns of eutectic phase in M0 alloy.

Fig. 4. XRD patterns of Mg89-xZn2Y4Li5Mnx alloys.

Fig. 5. EDXS mapping of M1 alloy.

Fig. 6. Stress-strain curves of Mg89-xZn2Y4Li5Mnx alloys.

Fig. 7. Fracture morphologies of the tensile specimens: (a, b) M1 alloy; (c, d) M0 alloy.

Fig. 8. SEM images of (a) M0 alloy and (b) M1 alloy.

Fig. 9. Area fraction of each phase in five alloys.

Fig. 10. Corrosion morphologies of (a-c) M0 alloy and (d-f) M1 alloy after immersing for 1-3 h without removal of corrosion product.

Fig. 11. Corrosion morphologies of (a-c) M0 alloy and (d-f) M1 alloy after immersing for 4-6 h without removal of corrosion product.

Fig. 12. SEM images of corrosion product film: (a, c, e) M0 alloy; (b, d, f) M1 alloy.

Fig. 13. Partial enlarged view for (a) Fig. 12(d) and (b), (f) in yellow rectangular region, respectively.

Fig. 14. SEM images of alloys without corrosion product: (a) M0 alloy immersed 4 h; (b) M1 alloy immersed 4 h; (c) M0 alloy immersed 24 h; (d) M1 alloy immersed 24 h.

Fig. 15. Schematic illustrations of the corrosion mechanism of (a) M0 alloy and (b) M1 alloy.

Fig. 16. Longitudinal corrosion morphologies of (a) M0 alloy and (b) M1 alloy.

Fig. 17. (a) Hydrogen evolution curves of M0-M2 alloys and (b) corrosion rates measured by weight loss (PW) and hydrogen evolution (PAH).

Fig. 18. Polarization potential curves of five alloys.

Table 2 Fitting results of polarization curves of five alloys.

Alloy	Potential, E_corr (V vs. SCE)	Current density, i_corr (μA/cm²)
M0	-1.5141	21.924
M0.5	-1.4254	2.5813
M1	-1.4461	1.2788
M1.5	-1.4919	14.918
M2	-1.4955	17.849

Fig. 19. EIS spectra of the five alloys with fitting results.

Table 3 Equivalent circuit parameters obtained by fitting the experimental EIS results.

Alloy	R_s (Ω cm²)	C (μΩ^-1 cm^-2 s^-1)	R_ct (Ω cm²)	CPE		C_f (μΩ^-1 cm^-2 s^-1)	R_f (Ω cm²)	R_p (Ω cm²)
				Y (μΩ^-1 cm^-2 s^-1)	n
M0	8.586	5.556	2116	20.28	0.5247	2158.52	1204	3320
M0.5	8.545	4.412	988.8	19.59	0.6637	262.18	8476	9464.8
M1	8.639	4.152	1207	19.37	0.8355	53.07	9959	11166
M1.5	8.352	4.948	1143	23.79	0.6769	297.27	8198	9341
M2	8.488	4.667	862.6	20.64	0.6355	399.14	5450	6312.6

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Modification of Mn on corrosion and mechanical behavior of biodegradable Mg₈₈Y₄Zn₂Li₅ alloy with long-period stacking ordered structure

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