Effects of Y and Zn additions on electrical conductivity and electromagnetic shielding effectiveness of Mg-Y-Zn alloys

doi:10.1016/j.jmst.2018.12.010

Abstract

Abstract:

Microstructure, electrical conductivity, and electromagnetic interference (EMI) shielding effectiveness (SE) of cast Mg-xZn-yY (x = 2-5, y = 1-10) alloys were systematically investigated to understand the effects of Zn and Y additions on electrical conductivity and electromagnetic shielding effectiveness of the alloys. Experimental results indicate that the electrical conductivity and SE of the Mg-xZn-yY alloys decrease with Y/Zn ratio. Electrical conductivity is the main factor that affects the electromagnetic shielding properties and the variation tendency of electromagnetic shielding properties of the Mg-xZn-yY alloys is consistent with conductivity. Valence of Y and Zn atoms, configuration of extranuclear electron and volumetric difference are main reasons for the variations in the electrical conductivity. A high density of second phase and the formation of semi-continuous network structure can also improve the SE value at high frequencies.

Key words: Mg-Zn-Y alloy, Electrical conductivity, Electromagnetic shielding effectiveness

Lizi Liu, Xianhua Chen, Jingfeng Wang, Liying Qiao, Shangyu Gao, Kai Song, Chaoyue Zhao, Xiaofang Liu, Di Zhao, Fusheng Pan. Effects of Y and Zn additions on electrical conductivity and electromagnetic shielding effectiveness of Mg-Y-Zn alloys[J]. J. Mater. Sci. Technol., 2019, 35(6): 1074-1080.

Figures/Tables 11

Table 1 Chemical composition and main phases of the Mg-Zn-Y alloys.

Alloy	Zn	Y	Y/Zn	Main phases	Alloy	Zn	Y	Y/Zn	Main phase
ZW20	1.8	0.5	0.28	I-phase	ZW30	2.6	0.9	0.35	I-phase
ZW21	2.1	0.8	0.38	I + W-phase	ZW31	2.8	1.2	0.43	I + W-phase
ZW22	1.9	2	1.05	W + X-phase	ZW33	3.1	3.1	1.00	W + X-phase
ZW24	2.1	4.3	2.05	X-phase	ZW36	2.7	6.2	2.29	X-phase
ZW40	4.1	0.7	0.17	I-phase	ZW50	5.0	0.9	0.18	I-phase
ZW41	4.2	1.3	0.31	I + W-phase	ZW52	5.1	1.7	0.33	I + W-phase
ZW44	3.6	4	1.11	W + X-phase	ZW55	4.8	5.1	1.06	W + X-phase
ZW48	3.7	7.8	2.11	X-phase	ZW5-1	5.1	9.7	1.90	X-phase

Fig. 1. XRD patterns of the (a) ZW2x; (b) ZW3x; (c) ZW4x and (d) ZW5x alloys.

Fig. 2. SEM images of the (a, e) ZW20, (b, f) ZW21, (c, g) ZW22, (d, h) ZW24. (e), (f), (g), and (h) are the magnified images of the (a), (b), (c) and (d), respectively.

Fig. 3. SEM images of the (a, e) ZW30, (b, f) ZW31, (c, g) ZW33, (d, h) ZW36. (e), (f), (g), and (h) are the magnified images of the (a), (b), (c) and (d), respectively.

Fig. 4. SEM images of the (a, e) ZW40, (b, f) ZW41, (c, g) ZW44, (d, h) ZW48. (e), (f), (g), and (h) are the magnified images of the (a), (b), (c) and (d), respectively.

Fig. 5. SEM images of the (a, e) ZW50, (b, f) ZW52, (c, g) ZW55, (d, h) ZW5-10. (e), (f), (g), and (h) are the magnified images of the (a), (b), (c) and (d), respectively.

Fig. 6. (a) Electrical conductivity of Mg-Zn-Y alloys; (b) electrical conductivity variation with the Y/Zn ratio.

Fig. 7. Electromagnetic shielding effectiveness of Mg-Zn-Y alloys at (a) 400 and (c) 600 MHz; electromagnetic shielding effectiveness variation with the Y/Zn ratio at (b) 400 and (d) 600 MHz.

Table 2 ΔV/VMg, valency, configuration of extranuclear electron of Y and Zn [36].

Element	ΔV/V_Mg (%)	Valency	Configuration of extranuclear electron
Zn	-34.144	+2	3d¹⁰4s²
Y	+41.732	+3	4d¹5s²

Table 3 Physical properties of pure Mg [38].

μ_r	σ_r	μ₀ (H/m)	σ₀ (S/m)	μ (H/m)	σ (S/m)
1	0.4	4 × 10^-7	5.8 × 10^-7	4 × 10^-7	2.3 × 10^-7

Fig. 8. Relationship between SE and the relative electrical conductivity of ZW36 alloy at 400 and 600 MHz, respectively.

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