the effect of rod-shaped long-period stacking ordered phases evolution on corrosion behavior of mg95.33zn2y2.67 alloy

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ID: 201457
2018
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Abstract
The morphology evolution of long-period stacking ordered (LPSO) phases on corrosion behavior of Mg95.33Zn2Y2.67 alloy is investigated systematically during as-cast, pre-extrusion heat-treated, as-extruded and post-extrusion heat-treated conditions. The second phases in the as-cast alloy are only LPSO phases with a few Y particles. The pre-extrusion heat treatment changed LPSO phases from blocks into a rudimentary rod shape with lamellar structure, subsequently into fine fragments by extrusion, and then into a regular rod shape with lamellar structure followed by post-extrusion heat treatment. Immersion tests and electrochemical measurements in 3.5 wt % NaCl solution reveal that the post-extrusion heat-treated alloy has the best corrosion resistance with the lowest corrosion rate. This is attributed to the rod-shaped LPSO phases, which could hinder corrosion proceeding, and result in corrosion orientated along the direction of rods and forming relatively dense long-strip corrosion products. Our findings demonstrate that the improved corrosion resistance of magnesium alloys with LPSO phases can be tailored effectively by the proceeding technology and post-heat treatment.
Reference Key
wang2018materialsthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Jingfeng Wang;Weiyan Jiang;Shengfeng Guo;Yang Li;Yao Ma
Journal Nature Materials
Year 2018
DOI
10.3390/ma11050815
URL
http://www.mdpi.com/1996-1944/11/5/815
Keywords
energy transfer electronic properties selective laser melting residual stress magnesium alloy electronics civil engineering (general)microscopydescriptive and experimental mechanics nuclear engineeringengineering (general) divisional scanning

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