Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 886, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160970
Keywords
CaO particles; Microstructure; Mechanical properties; Corrosion resistance
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Funding
- Joint Foundation of the National Natural Science Foundation of China [U1764254]
- National Natural Science Foundation of China [51871166]
- Major science and technology projects in Tianjin [15ZXQXSY00080]
- Nature Science Foundation of Tianjin City of China [18JCQNJC73600]
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The grain size of AZ91 alloy decreases non-linearly with the increase of CaO particle size. The in-situ replacement reaction between CaO and Mg matrix improves mechanical properties and corrosion resistance, while nano-CaO particles affect the performance of the alloy.
The effects of calcium oxide (CaO) particle size on the microstructure and properties of AZ91 alloy were investigated using commercial AZ91 (Mg-9Al-1Zn, wt%) alloy and CaO nano (50 nm), sub-micro (200 nm, 500 nm) and micro (1000 nm) particles as grain refiners. The results showed that the grain size of AZ91 alloy decreased non-linearly with the increase of CaO particle size from nano to micro. When the particle size was sub-micro (500 nm), the grain size decreased from 167.8 mu m to the lowest value of 33.7 mu m. Due to the in-situ replacement reaction between CaO and Mg matrix, a newly formed Al2Ca phase distributed uniformly, consuming elemental Al, which greatly reduced the content of the beta-Mg17Al12 phase. As a result, AZ91-CaO500 nm alloy has relatively high mechanical properties and corrosion resistance. In addition, the research revealed that nano-CaO particles were too small to melt into AZ91 alloy completely and un-dissolved CaO particles residual in the form of a mixed aggregate, resulting in lower mechanical properties and corrosion resistance of AZ91-CaO(50 nm )alloy compared with AZ91-CaO500 (nm) alloy, and even lower than other alloys in this study. (C) 2021 Elsevier B.V. All rights reserved.
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