Effect of Y and Ce on the microstructure, mechanical properties and anisotropy of as-rolled Mg-8Li-1Al alloy

doi:10.1016/j.jmst.2019.04.045

Abstract

Abstract:

The effects of combined addition of Y and Ce on the microstructure, mechanical properties and anisotropy of as-rolled Mg-8Li-1Al (LA81) alloy were studied. The combined addition of Y and Ce improves the mechanical properties with a low plasticity loss by solution strengthening, dispersion strengthening, grain refinement strengthening. Mg-8Li-1Al-0.6Y-0.6Ce (LA81-0.6Y-0.6Ce) has better mechanical properties and shows an almost isotropy. It possesses an ultimate tensile strength of 278.7 MPa and an elongation of 15.0%. Compared to LA81 alloy, the ultimate tensile strength increases by about 17.6% with an elongation reduction of only 3.5%, and a good isotropy of ultimate tensile strength and elongation (the value of r_avg is near 1).

Key words: Mg-Li alloy, Cross rolling, Alloying, Mechanical properties, Anisotropy

Feng Zhong, Huajie Wu, Yunlei Jiao, Ruizhi Wu, Jinghuai Zhang, Legan Hou, Milin Zhang. Effect of Y and Ce on the microstructure, mechanical properties and anisotropy of as-rolled Mg-8Li-1Al alloy[J]. J. Mater. Sci. Technol., 2020, 39: 124-134.

Figures/Tables 13

Fig. 1. Schematic diagram of the tensile testing specimens.

Fig. 2. Tensile stress?strain curves of as-rolled LA81-xY-yCe sheets: (a) LA81, (b) LA81-0.6Y, (c) LA81-0.6Ce, (d) LA81-0.6Ce-0.3Y, (e) LA81-0.6Ce-0.6Y, (f) LA81-0.6Ce-0.9Y, (g) LA81-0.6Ce-1.2Y.

Fig. 3. Mechanical behavior of as-rolled LA81-xY-yCe sheets at room temperatures: (a) ultimate tensile strength, (b) yield strength, (c) elongation.

Table 1 Anisotropic factor of as-rolled sheets.

Alloys	r value			r_avg	△r
	RD	45°	TD
LA81	2.40	2.62	1.16	2.2	0.84
LA81-0.6Y	1.30	2.14	1.74	1.83	0.62
LA81-0.6Ce	1.51	1.30	0.53	1.16	0.28
LA81-0.6Ce-0.3Y	0.95	1.60	1.21	1.34	0.56
LA81-0.6Ce-0.6Y	0.72	1.06	1.46	1.07	0.03
LA81-0.6Ce-0.9Y	0.93	1.07	1.40	1.11	0.095
LA81-0.6Ce-1.2Y	2.03	1.12	1.44	1.42	0.615

Fig. 4. Fracture morphologies of as-rolled LA81-xY-yCe alloys at room temperature: (a) LA81, (b) LA81-0.6Y, (c) LA81-0.6Ce, (d) LA81-0.6Ce-0.3Y, (e) LA81-0.6Ce-0.6Y, (f) LA81-0.6Ce-0.9Y, (g) LA81-0.6Ce-1.2Y.

Fig. 5. XRD patterns of as-cast LA81-xY-yCe.

Table 2 Lattice parameters and c/a ratio of as-cast LA81-xY-yCe.

Alloys	a (Å)	c (Å)	c/a
LA81	3.19505	5.13255	1.6064
LA81-0.6Y	3.19355	5.12999	1.6063
LA81-0.6Ce	3.19434	5.12907	1.6056
LA81-0.6Ce-0.3Y	3.19454	5.12983	1.6058
LA81-0.6Ce-0.6Y	3.19393	5.12858	1.6057
LA81-0.6Ce-0.9Y	3.19198	5.12608	1.6059
LA81-0.6Ce-1.2Y	3.19306	5.12798	1.6059

Fig. 6. XRD patterns of as-rolled LA81-xY-yCe.

Fig. 7. SEM images of as-cast LA81-xY-yCe: (a) LA81, (b) LA81-0.6Y, (c) LA81-0.6Ce, (d) LA81-0.6Ce-0.3Y, (e) LA81-0.6Ce-0.6Y, (f) LA81-0.6Ce-0.9Y, (g) LA81-0.6Ce-1.2Y.

Fig. 8. SEM images of as-rolled LA81-xY-yCe: (a) LA81, (b) LA81-0.6Y, (c) LA81-0.6Ce, (d) LA81-0.6Ce-0.3Y, (e) LA81-0.6Ce-0.6Y, (f) LA81-0.6Ce-0.9Y, (g) LA81-0.6Ce-1.2Y.

Fig. 9. Optical micrographs of as-rolled LA81-xY-yCe: (a) LA81, (b) LA81-0.6Y, (c) LA81-0.6Ce, (d) LA81-0.6Ce-0.6Y.

Fig. 10. 3D optical micrographs of as-rolled LA81-xY-yCe: (a) LA81, (b) LA81-0.6Y, (c) LA81-0.6Ce, (d) LA81-0.6Ce-0.6Y.

Fig. 11. Pole figures of as-rolled Mg-8Li-Al-xY-yCe alloy: (a) (0002) pole figure of LA81, (b) (0002) pole figure of LA81-0.6Y-0.6Ce, (c) (110) pole figure of LA81, (d) (110) pole figure of LA81 LA81-0.6Y-0.6Ce.

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