Microstructure and Mechanical Property of the Large Cross-Sectioned Mg-Gd-Y-Zn-Zr Alloy Produced by Small Extrusion Ratio

doi:10.1007/s40195-024-01682-4

Abstract

Abstract:

In this work, the microstructure and mechanical properties of large cross-sectioned Mg–9Gd–3Y–1.2Zn–0.5Zr (VWZ931) samples produced by the small extrusion ratio has been investigated. The as-extruded VWZ931 sample with diameter of ~ 30 mm can exhibit the high yield strength (YS) of 339 MPa, ultimate tensile strength (UTS) of 387 MPa and elongation of 8.2%, respectively. After peak-aged, the YS and UTS of the Mg samples were significantly increased to 435 MPa and 467 MPa. The small extrusion ratio leads to the low fraction of dynamic recrystallized (DRX) grains in VWZ931 sample, and the texture hardening effect can be fully utilized to achieve high strength. The combined effect of precipitation strengthening due to the long-period stacking ordered phases and the $\beta$′ phase, grain boundary strengthening due to the fine DRX grains, heterogeneous deformation-induced strengthening caused by bimodal microstructure, can together contribute to the high strength of present Mg alloy. The findings can shed light on designing other large-sized Mg wrought alloys with high mechanical performance.

Key words: Mg-RE alloy, Mechanical property, Bimodal grains, Texture hardening

Sen Wang, Hucheng Pan, Caixia Jiang, Zhihao Zeng, Zhen Pan, Weineng Tang, Chubin Yang, Yuping Ren, Gaowu Qin. Microstructure and Mechanical Property of the Large Cross-Sectioned Mg-Gd-Y-Zn-Zr Alloy Produced by Small Extrusion Ratio[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(6): 999-1006.

Figures/Tables 9

Fig. 1 Engineering stress-strain tensile curve for the as-extruded (0 h) and peak-aged (40 h) VWZ931 samples

Table 1 Mechanical properties of the as-extruded and peak-aged VWZ931 samples

Samples	YS (MPa)	UTS (MPa)	EL (%)
As-extruded	339 ± 8.2	387 ± 5.3	8.2 ± 1.1
Peak-aged	435 ± 11.7	467 ± 12.5	3.1 ± 0.5

Fig. 2 OM images of a the as-extruded, b peak-aged VWZ931 samples

Fig. 3 SEM images of the as-extruded a, b; peak-aged alloys c, d; a, c low-magnification and b, d high-magnification images

Table 2 EDS results (at.%) corresponding to each point in Fig. 3

Point	Mg	Gd	Y	Zn	Zr
A	81.69	9.69	2.70	5.93	0
B	45.96	1.84	4.74	2.14	45.31

Fig. 4 HAADF-STEM image of the microstructure a of the as-extruded sample, HAADF-STEM image of LPSO phases and corresponding SAED (selected area electron diffraction) b under B = < 10-10 > α-Mg, high-resolution TEM images of LPSO phase c

Fig. 5 STEM image of the microstructure a of the peak-aged sample, TEM image of phase b, the corresponding SAED c under B = < 11 $\stackrel{\mathrm{-}}{2}$ 0 > α-Mg

Fig. 6 EBSD orientation map of a the as-extruded alloy, b the corresponding (0001) pole figure, c inverse pole figure, d kernel average misorientation figure, e grain boundary misorientation angle distribution

Fig. 7 a IPF map of DRX grains at grain boundaries, b misorientation profiles along the vector A-B, c corresponding (0001) PF map; d IPF map of DRX grains between lamellar LPSO phases, e misorientation profiles along the vector C-D, f corresponding (0001) PF map

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