Enhancing mechanical properties and degradation performance of Mg−0.8wt.%Ca alloy by directional solidification

The mechanical properties and degradation performance in Hank's solution of the directionally solidified (DSed) Mg−0.8Ca (wt.%) alloys were investigated and compared with those of the as-cast alloy. The microstructure was studied by OM, SEM, TEM, and EBSD. It is found that the columnar grains i...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2023-02, Vol.33 (2), p.409-421
Main Authors: ZHANG, Yi, FENG, Xiao-hui, HUANG, Qiu-yan, LI, Ying-ju, YANG, Yuan-sheng
Format: Article
Language:English
Subjects:
degradation performance
directional solidification
mechanical properties
Mg−Ca alloy
microstructure
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Summary:The mechanical properties and degradation performance in Hank's solution of the directionally solidified (DSed) Mg−0.8Ca (wt.%) alloys were investigated and compared with those of the as-cast alloy. The microstructure was studied by OM, SEM, TEM, and EBSD. It is found that the columnar grains in DSed alloys have a consistent growth orientation of . The mechanical strength and ductility of Mg−0.8Ca alloy are significantly improved after directional solidification. Besides, the corrosion resistance of Mg−0.8Ca alloy in Hank's solution is dramatically enhanced after directional solidification. The Mg−0.8Ca alloys in Hank's solution mainly undergo microgalvanic corrosion, and the corrosion products consist of Mg(OH)2, (Ca, Mg)3(PO4)2, and hydroxyapatite (HA). The superior properties of the DSed Mg−Ca alloy are beneficial from the columnar microstructure and the redistribution of the eutectics. The DSed Mg−0.8Ca alloy with columnar dendritic structure is expected to be used as biodegradable materials.
ISSN:1003-6326
DOI:10.1016/S1003-6326(22)66116-8