Improving Ductility and Anisotropy by Dynamic Recrystallization in Ti/Mg Laminated Metal Composite

doi:10.1007/s40195-022-01442-2

Abstract

Abstract:

Ti/Mg laminated metal composites (LMCs) were processed by hot roll bonding and subsequent annealing at 200 °C and 300 °C for 1 h, and the effect of dynamic recrystallization on the microstructure and anisotropy behavior was investigated in detail. The results revealed that, in both as-rolled and annealed Ti/Mg LMCs, the inhomogeneous distribution in the microstructure of Mg layers near the interface and near the center was related to the effect of friction between the roller and sheet surface and uncoordinated deformation between constituent layers. With increasing annealing temperature, Ti/Mg LMCs exhibited excellent elongation without sacrificing strength properties, which was mainly due to the improvement in bonding strength and the increasing strain gradient at the interface between soft and hard layers after annealing treatment. Besides, the increasing Schmid factors (SFs) of prismatic < a > slip and pyramidal < c + a > slip in Mg layers contributed to the improved plastic deformation ability of Ti/Mg LMCs. The experimental analysis indicated that the presence of Mg alloys resulted in the microstructure and mechanical properties of LMCs were different along various loading directions, and annealing treatment can effectively inhibit the anisotropic behavior of Ti/Mg LMCs resulting from the weakening of basal texture in the Mg layer.

Key words: Ti/Mg laminated metal composites, Dynamic recrystallization, Microstructure, Mechanical properties, Anisotropy

Taiqian Mo, Huaqiang Xiao, Bo Lin, Wei Li, Kai Ma. Improving Ductility and Anisotropy by Dynamic Recrystallization in Ti/Mg Laminated Metal Composite[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(12): 1946-1958.

Figures/Tables 15

Fig. 1 a Optical microscopy images of the initial materials, b schematic illustration of the fabrication process of the Ti/Mg LMC before annealing, c macroscopic interface structure of Ti/Mg LMC and corresponding EDS results

Fig. 2 EBSD maps of the Mg layer near the interface as obtained from the RD, TD and 45° angle: a, d, g as-rolled, b, e, h 200 °C/1 h, c, f, i 300 °C/1 h

Fig. 3 EBSD maps of the Mg layer near the center as obtained from the RD, TD and 45° angle: a, d, g as-rolled, b, e, h 200 °C/1 h, c, f, i 300 °C/1 h

Fig. 4 Recrystallized, substructured and deformed microstructures of the Mg layer in Ti/Mg LMCs after annealing at the positions near the interface and near the center: a, b as-rolled, c, d 200 °C/1 h, e, f 300 °C/1 h

Table 1 Maximum peeling strength of Ti/Mg LMCs for the as-rolled and annealed specimens

Specimens	Load (N)	Width (mm)	Peeling strength (N/mm)
As-rolled	111.2	5	22.2
200 °C/1 h	136.5	5	27.3
300 °C/1 h	140.9	5	28.2

Fig. 5 Morphologies of fracture surfaces and element distribution maps on the Ti side after the peeling test: a as-rolled, b 200 °C, c 300 °C

Fig. 6 Morphology of fracture surfaces and element distribution maps on the Mg side after the peeling test: a as-rolled, b 200 °C/1 h, c 300 °C/1 h

Fig. 7 XRD patterns of the peeling surface of the Ti/Mg LMCs for the as-rolled and annealed specimens: a Ti side, b Mg side

Fig. 8 a Schematic illustration of the hardness test, b hardness distribution along the thickness direction of Ti/Mg LMCs for the as-rolled and annealed specimens

Fig. 9 a Fracture process during the tensile test of Ti/Mg LMCs. Engineering stress-strain curves of b initial materials and Ti/Mg LMCs along the RD, TD and 45° angle under the various conditions: c as-rolled, d 200 °C/1 h, e 300 °C/1 h

Fig. 10 Schematic illustration of microstructural evolution and deformation behavior of Ti/Mg LMCs under various conditions: a as-rolled, b 200 °C/1 h, c 300 °C/1 h

Fig. 11 SF distribution of the Mg layer for Ti/Mg LMCs under the conditions of (a-c) as-rolled state, d-f annealed state at 200 °C/1 h

Fig. 12 SEM fracture surface morphologies of Mg and Ti constituent layers under the conditions of a, d as-rolled, b, e 200 °C/1 h, c, f 300 °C/1 h

Table 2 Variation in anisotropy parameters under the conditions of as-rolled and annealed Ti/Mg LMCs

Processing condition	Direction	UTS (MPa)	Elongation to failure (%)	%IPA
As-rolled	RD	342.9	0.361	4.8
	45°	363.5	0.365
	TD	349.3	0.352
200 °C/1 h	RD	336.6	0.396	3.0
	45°	349.8	0.383
	TD	341.8	0.402
300 °C/1 h	RD	343.9	0.452	0.9
	45°	342.1	0.422
	TD	346.2	0.438

Fig. 13 ODF maps showing the texture characteristics of the Mg layer in Ti/Mg LMCs along the RD, TD and 45° angles

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