4.5 Article

High Ductility with a Homogeneous Microstructure of a Mg-Al-Zn Alloy Prepared by Cyclic Expansion Extrusion with an Asymmetrical Extrusion Cavity

Journal

METALS
Volume 10, Issue 8, Pages -

Publisher

MDPI
DOI: 10.3390/met10081102

Keywords

cyclic expansion extrusion with asymmetrical extrusion cavity; AZ31B alloy; microstructure; texture; mechanical properties

Funding

  1. National Natural Science Foundation of China (NSFC) [51775520, 51675492]
  2. Natural Science Foundation of Shanxi Province [201801D121106]
  3. Key R&D program of Shanxi Province (International Cooperation) [201903D421036]
  4. Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [2018002]

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In the current work, cyclic expansion extrusion with an asymmetrical extrusion cavity (CEE-AEC), as a relatively novel severe plastic deformation method, was applied to fabricate an AZ31B magnesium alloy plate with a size of 50 x 100 x 220 mm, and the resultant microstructure, texture development, and mechanical properties were systematically investigated. A refined and homogeneous grain structure was achieved after three passes of deformation due to dynamic recrystallization. The grain refinement degree in comparison to as-cast alloys was more than similar to 96%. With the increasing number of CEE-AEC passes, a basal inclination texture was gradually formed, with the basal planes inclined similar to 45 degrees from the transverse direction to the extrusion direction, which could be attributed to the introduction of an asymmetrical extrusion cavity that led to an increasing Schmid factor for the activation of basal slip systems. The comprehensive mechanical properties were improved by successive multi-passes of CEE-AEC processing, especially due to the ductility reaching to 30.0 +/- 1.3% after three passes of deformation. The competition between the grain refinement and texture modification were the main strengthening mechanisms.

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