RESEARCH ARTICLE

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

  • Feng LI ,
  • Yang LIU ,
  • Xu-Bo LI
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  • School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China

Received date: 06 May 2017

Accepted date: 12 Jun 2017

Published date: 24 Aug 2017

Copyright

2017 Higher Education Press and Springer-Verlag Berlin Heidelberg

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.

Cite this article

Feng LI , Yang LIU , Xu-Bo LI . Dynamic recrystallization behavior of AZ31 magnesium alloy processed by alternate forward extrusion[J]. Frontiers of Materials Science, 2017 , 11(3) : 296 -305 . DOI: 10.1007/s11706-017-0387-7

Acknowledgement

This project was supported by the National Natural Science Foundation of China (Grant No. 51675143).
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