Microstructure and performance of AZ80D magnesium alloy by purification of chloride flux containing Er

The purification effects of Er addition in chloride flux during smelting on microstructure, tensile properties, and corrosion resistance of as-cast AZ80D magnesium alloy were carried out. The results show that Er addition in the flux can eliminate the MgO inclusions and improve the tensile propertie...

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Bibliographic Details
Published in:Rare metals 2014-10, Vol.33 (5), p.541-546
Main Authors: Wang, Zhong-Jun, Su, Guan-Qiao, Jia, Wei-Ping, Yang, Qing-Xiang
Format: Article
Language:English
Subjects:
Biomaterials
Chemistry and Materials Science
Chlorides
Corrosion resistance
Dendritic structure
Energy
Erbium
Flux
Magnesium base alloys
Materials Engineering
Materials Science
Metallic Materials
Microstructure
Nanoscale Science and Technology
Physical Chemistry
Tensile properties
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Summary:The purification effects of Er addition in chloride flux during smelting on microstructure, tensile properties, and corrosion resistance of as-cast AZ80D magnesium alloy were carried out. The results show that Er addition in the flux can eliminate the MgO inclusions and improve the tensile properties and corrosion resistance of the alloy. Using chloride flux mixed with 8.0 wt% Er, σ b and δ of the as-cast AZ80D magnesium alloy can be improved from 150 MPa and 2.1 % to the maximum value of 230 MPa and 4.8 %, respectively. Meanwhile, the corrosion rate decreases from 1.10 to 0.12 mg·(cm 2 ·d) −1 in 5 wt% NaCl solution. However, with increasing Er content in chloride flux further, φ-(Al 7 ErMn 5 ) and τ-(Al 66.7 Mg 23.3 Er 10 ) phase are formed, and the morphology of γ-(Mg 17 Al 12 ) phase is modified. The coarse φ-(Al 7 ErMn 5 ) phase along dendrite boundaries decreases cohesion force between dendrites, which results in the worse of tensile properties.
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-013-0109-y