Effect of Extrusion Combination Types on Microstructure and Mechanical Properties of the AZ31/GW103K Bimetallic Composite Plates

doi:10.1007/s40195-022-01438-y

Abstract

Abstract:

The AZ31/GW103K bimetallic composite plates were prepared by co-extrusion of different combination types (sandwich extrusion type and double semicircle extrusion type), and effects of different extrusion combination types on the microstructure and mechanical properties of bimetallic composite plates were systematically investigated. The results show that both the AZ31/GW103K bimetallic composite plates prepared by different extrusion combination types have good metallurgical bonding, and changing the combination type does not affect the thickness of the interfacial transition layer of composite plates. Compared with the monolithic AZ31 and GW103K extruded plates, co-extrusion can promote the dynamic recrystallization (DRX) of AZ31 and GW103K components in composite plates, and double semicircular extrusion type has a better promotion effect on the DRX than sandwich extrusion type. In addition, the texture of AZ31 in both monolithic AZ31 and AZ31/GW103K/AZ31 (A/G/A) plates is a typical (0002) basal texture, while that in the AZ31/GW103K (A/G) composite plate shifts to the tangent direction (TD) of extruded plate. Compared with the monolithic AZ31 extruded plate, both the yield strength and tensile strength of A/G and A/G/A bimetallic composite plates are significantly improved. The strength of A/G/A composite plate is higher than that of A/G composite plate, but its elongation is worse. Meanwhile, co-extrusion reduces the dislocation density of AZ31 and GW103K components in composite plates, and different extrusion combination types also affect the dislocation density.

Key words: Bimetallic composite plates, Extrusion combination types, Dynamic recrystallization, Dislocation density, Mechanical behavior

Yunpeng Meng, Boyu Lin, Lifei Wang, Jianfeng Fan, Shangzhou Zhang, Liwei Lu, Hans Jørgen Roven, Hua Zhang. Effect of Extrusion Combination Types on Microstructure and Mechanical Properties of the AZ31/GW103K Bimetallic Composite Plates[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(12): 1959-1972.

Figures/Tables 14

Fig. 1 a Fabrication flow chart of A/G/A and A/G bimetallic composite plates, b dimensions of tensile sample

Table 1 Chemical composition of AZ31 and GW103KMg alloys (wt%)

Alloy	Mg	Al	Zn	Gd	Y	Mn	Zr	Si	Cu	Ni	Fe
AZ31	Bal.	2.5	0.7	-	-	0.2	-	0.3	0.05	0.005	0.005
GW103K	Bal.	-	-	10.4	2.85	-	0.45	< 0.005	< 0.005	< 0.005	< 0.005

Fig. 2 Microstructure of interfacial area of A/G bimetallic composite plate: a SEM at low magnification; b EDS line-scanning analysis at high magnification; EDS map scanning of Mg (red point), Al (green point), Gd (blue point) and Y (yellow point) corresponding to c-f

Fig. 3 Microstructure of interfacial area of A/G/A bimetallic composite plate: a SEM at low magnification; b EDS line-scanning analysis at high magnification; EDS map scanning of Mg (red point), Al (green point), Gd (blue point) and Y (yellow point) corresponding to c-f

Fig. 4 EDS analysis of precipitated phase in interface area: a a phase in Fig. 2b; b B phases in Fig. 3, c C phases in Fig. 3b

Fig. 5 Metallographic microstructures of different extruded plates: a monolithic AZ31; b monolithic GW103K; c AZ31-A/G/A; d GW103K-A/G/A; e AZ31-A/G; f GW103K-A/G

Table 2 Volume fractions of DRXed grains of AZ31 and GW103K in different extruded plates

Samples	Monolithic plate (%)	A/G/A plate (%)	A/G plate (%)
AZ31	87.60	95.80	100
GW103K	53.90	62.90	77.30

Fig. 6 IPF and PF maps of AZ31 in different extruded plates: a monolithic AZ31, b AZ31-A/G/A, c AZ31-A/G

Fig. 7 Grain boundary and MAD maps in the AZ31 of different extruded plates: a, b monolithic AZ31; c, d AZ31-A/G/A; e, f AZ31-A/G

Fig. 8 Engineering stress-strain curves for different extruded plates

Table 3 Yield strength, tensile strength and elongation of different extruded plates

Plates	Yield strength (MPa)	Tensile strength (MPa)	Elongation (%)
AZ31	218	286	24.2
A/G	279	325	8.1
A/G/A	292	338	7.5
GW103K	353	441	9.2

Fig. 9 IPF and PF maps of unDRXed grains and DRXed grains of AZ31 in different extruded plates: a, b monolithic AZ31; c, d AZ31-A/G/A; e, f AZ31-A/G

Fig. 10 KAM maps and the local misorientation average angle distributions of AZ31 in different extruded plates: a, b monolithic AZ31; c, d A/G/A-AZ31; e, f A/G-AZ31

Table 4 Dislocation density of GW103K in different extruded plates

	Dislocation density (m⁻²)
Monolithic GW103K	3.28 × 10^-14
GW103K-A/G/A	2.39 × 10^-14
GW103K-A/G	0.86 × 10^-14

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