Effect of Solution Treatment on Microstructure and Corrosion Properties of Mg-4Gd-1Y-1Zn-0.5Ca-1Zr Alloy

doi:10.1007/s40195-018-0709-5

Abstract

Abstract:

The as-cast multi-element Mg-4Gd-1Y-1Zn-0.5Ca-1Zr alloy with low rare earth additions was prepared, and the solution treatment was applied at different temperatures. The microstructural evolution of the alloy was characterized by optical microscopy and scanning electron microscopy, and corrosion properties of the alloy in 3.5% NaCl solution were evaluated by immersion and electrochemical tests. The results indicate that the as-cast alloy is composed of the α-Mg matrix, lamellar long-period stacking-ordered (LPSO) structure and eutectic phase. The LPSO structure exists with more volume fraction in the alloy solution-treated at 440 °C, but disappears with the increase in the solution temperature. For all the solution-treated alloys, the precipitated phases are detected. The corrosion rates of the alloys decrease first and then increase slightly with the increase in the solution temperature, and the corrosion resistance of the solution-treated alloys is more than four times as good as that of the as-cast alloy. In addition, the alloy solution-treated at 480 °C for 6 h shows the best corrosion property.

Key words: Magnesium alloy, Solution treatment, Microstructure, Corrosion properties

Jian-Wei Dai, Xiao-Bo Zhang, Yang Fei, Zhang-Zhong Wang, Huai-Ming Sui. Effect of Solution Treatment on Microstructure and Corrosion Properties of Mg-4Gd-1Y-1Zn-0.5Ca-1Zr Alloy[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(8): 865-872.

Figures/Tables 9

Fig. 1 DSC curve of the as-cast Mg-4Gd-1Y-1Zn-0.5Ca-1Zr alloy

Fig. 2 Optical microstructures of the Mg-4Gd-1Y-1Zn-0.5Ca-1Zr alloy under different conditions: a F, b T4-440, c T4-480, d T4-520

Fig. 3 SEM image of the as-cast alloy with high magnification

Table 1 EDS-analyzed results of the various areas marked in Fig. 3 (wt%)

Area	Mg	Gd	Y	Zn	Ca	Zr
A	60.63	23.89	2.39	10.04	1.75	1.30
B	69.20	20.90	1.71	6.79	1.23	0.17
C	88.84	8.81	0.77	0.98	0.23	0.37
D	96.53	1.72	0.26	0.51	0.07	0.89
E	42.46	3.65	0	1.23	0.34	52.32

Fig. 4 SEM images of the solution-treated alloys: a T4-440, b T4-480, c T4-520

Table 2 Chemical composition (wt%) of the various areas marked in Fig. 4

Alloy	Area	Mg	Gd	Y	Zn	Ca	Zr
T4-440	A	71.73	18.27	2.02	7.06	0.48	0.44
	B	89.05	6.50	0.71	2.07	0.71	0.96
	C	94.17	3.33	0.96	0.67	0.48	0.38
	D	68.00	19.98	2.82	8.22	0.52	0.46
T4-480	E	90.26	4.52	0.84	1.85	0.43	2.10
	F	91.50	4.92	0.82	1.28	0.60	0.88
	G	92.29	5.34	0.31	1.53	0.40	0.12
T4-520	H	87.59	4.89	0.17	2.78	0.55	4.02

Fig. 5 XRD patterns of the Mg-4Gd-1Y-1Zn-0.5Ca-1Zr alloy

Fig. 6 Corrosion rates of the alloys immersed in 3.5% NaCl solution

Fig. 7 Polarization curves of the alloys tested in 3.5% NaCl solution

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