Microstructure and Mechanical Property of Hot-Rolled Mg-2Ag Alloy Prepared with Multi-pass Rolling

doi:10.1007/s40195-022-01462-y

Abstract

Abstract:

A conventional multi-pass rolling is designed to form different microstructures in a Mg-2Ag alloy. The relationship between microstructure and mechanical property is investigated. The result shows that twin-induced nucleation plays a prominent role for the dynamic recrystallization (DRX) behavior of the rolled Mg-2Ag alloys. The DRXed grains distributed around elongated grains have random orientations but gradually turn to the concentrated orientation with strong basal texture when the rolling pass increases. The yield strength and ultimate tensile strength of rolled Mg-2Ag alloy gradually increase with increasing rolling pass. The elongation of rolled sample is gradually improved when the rolling pass increases from one to three, while a significant drop of elongation shows in the four-pass rolling sample. The strong basal texture, refined grains, high-density dislocations, and Ag segregation along grain boundaries are suggested to play a prominent role for enhancing the strength of Mg-Ag alloys, while the low-density dislocations, homogeneously fine-grained microstructure, and weak texture are critical for improving the ductility.

Key words: Magnesium alloy, Conventional rolling, Twinning, Dynamic recrystallization, Texture

H. Zhang, H. L. Hao, G. Y. Fu, B. S. Liu, R. G. Li, R. Z. Wu, H. C. Pan. Microstructure and Mechanical Property of Hot-Rolled Mg-2Ag Alloy Prepared with Multi-pass Rolling[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(2): 335-342.

Figures/Tables 12

Table 1 Multi-pass rolling processes of rolled alloy

Mg-2Ag alloy	Holding temperature (°C)	Holding time (min)	Rolling temperature (°C)	Rolling speed (r/min)	Thickness change (mm)	Total reduction (%)
1-Pass	200	20	200	10	6→3.6	40
2-Pass	200	20	200	10	3.6→2.4	60
3-Pass	200	20	200	10	2.4→1.2	80
4-Pass	200	20	200	10	1.2→0.71	88

Fig. 1 Tensile engineering stress-strain curves for the solid-solution, 1-Pass, 2-Pass, 3-Pass, and 4-Pass samples

Table 2 Yield strength, ultimate tensile strength, elongation of rolled samples

Samples	YS (MPa)	UTS (MPa)	Elongation (%)
SS	42	164	9.8
1-Pass	141	205	1.5
2-Pass	200	261	4.9
3-Pass	203	286	6
4-Pass	245	295	1.5

Fig. 2 OM images for the 1-Pass a, 2-Pass b, 3-Pass c, 4-Pass d samples

Fig. 3 XRD pattern of the rolled Mg-2Ag alloy measuring along the RD-TD plane

Fig. 4 SEM images of the rolled Mg-2Ag alloy measuring along the RD-TD plane: a, e 1-Pass, b, f 2-Pass, c, g 3-Pass, d, h 4-Pass samples. The vertical direction is RD

Table 3 Grain size and volume fraction of DRX grains in rolled alloy

Samples	Grain size (μm)	Volume fraction (%)
1-Pass	1.3	9
2-Pass	1.3	45
3-Pass	1.4	100
4-Pass	1.8	100

Fig. 5 EBSD-IPF maps of the RD-TD planes with the reference direction parallel to ND a-c and RD d-f for 2-Pass a, d, 3-Pass b, e, 4-Pass c, f samples

Fig. 6 Calculations of Schmid factor for the basal slips in the 2-Pass a, 3-Pass b, 4-Pass c samples when tensile test is conducted along the RD

Fig. 7 {0002} and {10-10} pole figures for the 2-Pass a, 3-Pass b, 4-Pass c samples

Fig. 8 KAM maps a-c and misorientation distribution images d-f for the 2-Pass a, d, 3-Pass b, e, 4-Pass c, f samples

Fig. 9 TEM-EDS analysis of the 4-Pass sample: a TEM image of the microstructure containing the equiaxed grains, b high-angle annular dark-field (HAADF) image, c elemental distribution mapping of Ag in the selected area shown in b

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