Influence of Extrusion Joint on Microstructural Evolution and Properties of Mg Alloy Sheet

doi:10.1007/s40195-016-0411-4

Abstract

Abstract:

The mechanical behaviour of AZ31 magnesium alloy sheet with the extrusion joint (EJ) was evaluated. Extruded joint of AZ31 alloy sheets was obtained by the hot extrusion process. Tensile tests were carried out along the extrusion direction at room temperature, and both the non-uniform plastic deformation and the fracture behaviour were studied. It is found that the samples with EJ present significantly deteriorated mechanical properties compared with the EJ-free counterpart. Inhomogeneous microstructure distribution around EJ zone brings in the uncoordinated deformation due to the high density of \(\{ 10\bar{1}2\}\) twins which were readily activated during plastic deformation.

Key words: Mg alloy, Microstructure, Twin, Texture, Extrusion joint

Qing-Shan Yang, Zu-Jian Yu, Hu-Cheng Pan, Qing-Wei Dai, Jian-Hui Li. Influence of Extrusion Joint on Microstructural Evolution and Properties of Mg Alloy Sheet[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(5): 475-482.

Figures/Tables 11

Fig. 1 Schematic diagram of the samples for the tensile tests

Fig. 2 Optical microstructure and (0002) pole figure of AZ31 alloy sheet

Fig. 3 Optical microstructure of the extrusion joint (EJ) sample at the joint zone

Fig. 4 Optical microstructures of the joint zone at top a and middle b layers

Fig. 5 EBSD results of the microstructure and the misorientation distribution for AZ31 alloy sheet

Fig. 6 True stress-strain response of AZ31 alloy sheets

Table 1 Tensile properties of the AZ31 alloy sheet

Sample	YS	(MPa)	UTS	(MPa)	FE(%)
I	(without	EJ)	184	268	12.6
II	(with	EJ)	197	252	6.9

Fig. 7 Work-hardening (WH, θ) behaviour of the sample I and II

Fig. 8 Optical micrographs of fractured tensile samples: near the fracture surface a and away from the fracture surface b of the sample I; the joint zone c and near the fracture surface d of sample II

Fig. 9 EBSD maps of the fractured tensile samples

Fig. 10 Tensile fracture morphologies of the sample I (a, b, c) and sample II (d, e, f). (g) Near the fracture surface morphology of sample II. Energy dispersive spectroscopy (EDS) analysis of points (p1 and p2)

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