Dynamic recrystallization behavior of AZ31 magnesium alloy processed by alternate forward extrusion

doi:10.1007/s11706-017-0387-7

Front. Mater. Sci.

2017, Vol. 11

Issue (3) : 296-305 https://doi.org/10.1007/s11706-017-0387-7

RESEARCH ARTICLE

Dynamic recrystallization behavior of AZ31 magnesium alloy processed by alternate forward extrusion

Feng LI(

), Yang LIU, Xu-Bo LI

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China

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Abstract

One of the important factors that affect the microstructure and properties of extruded products is recrystallization behavior. Alternate forward extrusion (AFE) is a new type of metal extrusion process with strong potential. In this paper, we carried out the AFE process experiments of as-cast AZ31 magnesium alloy and obtained extrusion bar whose microstructure and deformation mechanism were analyzed by means of optical microscopy, electron backscattered diffraction and transmission electron microscopy. The experimental results indicated that homogeneous fine-grained structure with mean grain size of 3.91 μm was obtained after AFE at 573 K. The dominant reason of grain refinement was considered the dynamic recrystallization (DRX) induced by strain localization and shear plastic deformation. In the 573–673 K range, the yield strength, tensile strength and elongation of the composite mechanical properties are reduced accordingly with the increase of the forming temperature. Shown as in relevant statistics, the proportion of the large-angle grain boundaries decreased significantly. The above results provide an important scientific basis of the scheme formulation and active control on microstructure and property for AZ31 magnesium alloy AFE process.

Keywords magnesium alloy alternate forward extrusion (AFE) mechanical property dynamic recrystallization

Corresponding Author(s): Feng LI

Online First Date: 01 August 2017 Issue Date: 24 August 2017

Cite this article:

Feng LI,Yang LIU,Xu-Bo LI. Dynamic recrystallization behavior of AZ31 magnesium alloy processed by alternate forward extrusion[J]. Front. Mater. Sci., 2017, 11(3): 296-305.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-017-0387-7
https://academic.hep.com.cn/foms/EN/Y2017/V11/I3/296

Fig.1 The schematic of AFE.

Tab.1 AZ31 magnesium alloy compositions

Fig.2 Dies structure and extruded products: (a) conventional die; (b) extrusion extrudate using traditional die; (c) oriented die; (d) extrusion extrudate using oriented die.

Fig.3 Microstructure of the different extrusion direction at different temperatures: (a) perpendicular to the ED (ND and TD plane) at 573 K; (b) perpendicular to the ED (ND and TD plane) at 623 K; (c) perpendicular to the ED (ND and TD plane) at 673 K; (d) along the extrusion direction plane (ED and TD plane) at 573 K; (e) along the extrusion direction plane (ED and TD plane) at 623 K; (f) along the extrusion direction plane (ED and TD plane) at 673 K.

Fig.4 The orientation maps of (a) 573 K, (b) 623 K and (c) 673 K. The misorientation angles of (d) 573 K, (e) 623 K and (f) 673 K.

Fig.5 Texture evolution under different temperatures: (a) 573 K; (b) 623 K; (c) 673 K.

Fig.6 The tensile samples (a) before and (b) after fracture. (c) The comparison of mechanical properties.

Fig.7 The fracture morphologies: (a) magnified 20 times at 573 K; (b) magnified 20 times at 623 K; (c) magnified 20 times at 673 K; (d) magnified 200 times at 573 K; (e) magnified 200 times at 623 K; (f) magnified 200 times at 673 K.

Fig.8 TEM images: (a) grain morphology at 573 K; (b) dynamic recrystallization at 573 K; (c) grain morphology at 623 K; (d) dislocation in grain at 623 K; (e) triple grain boundary at 673 K; (f) second phase particle at 673 K.

Fig.9 The solid evidence of DRX: (a) orientation map with superimposed hcp unit cells magnified from Fig. 4(a); (b)(c)(d) orientation maps magnified from Fig. 4(a), LAGBs in grains and the examples which indicate that HAGBs are connected by LAGBs (HAGBs are marked with black lines while LAGBs with misorientations of (2°–5°) and (5°–15°) are marked with white and blue lines, respectively).

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