4.7 Article

Effect of Gd and Y contents on the microstructural evolution of long period stacking ordered phase and the corresponding mechanical properties in Mg-Gd-Y-Zn-Mn alloys

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.06.063

关键词

Magnesium alloy; Microstructure; Mechanical property; Long-period stacking ordered phase

资金

  1. Program for New Century Excellent Talents in University [NCET-11-0554]
  2. National Natural Science Foundation of China [51271206]
  3. National Basic Research Program of China [2013 CB632201]

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This study analyzes the effect of different Gd and Y contents on the microstructural evolution and mechanical properties of Mg-Gd-Y-Zn-Mn alloys. Microstructural analysis indicates the existence of both the long period stacking order and eutectic phases in the as-cast alloys. In case of alloys with high Gd and low Y contents, the main eutectic phase is (Mg,Zn)(3)(Gd, Y), while in alloys with high Y and low Gd contents, the main eutectic phase is Mg-24(Gd,Y,Zn)(5). The as-annealed alloys show only alpha-Mg and LPSO phases; the LPSO phases could be bulk-shaped and lamellar-shaped. The main composition of the LPSO phase with gray bulk-shaped morphology is Mg12ZnY, while the LPSO phase that penetrated thoroughly the grain is mainly Mg12ZnGd. After extrusion, the formation of distorted grains and lamellar-shaped LPSO phases in the alloys with high Gd and low Y contents tends to improve the strength of the as-extruded alloys, while the formation of isometric crystal grains in the alloys with high Y and low Gd contents enhances the alloy elongation. (C) 2014 Elsevier B.V. All rights reserved.

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