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Materials 2018, 11(8), 1467;

Microstructures, Mechanical and Corrosion Properties of the Extruded AZ31-xCaO Alloys

School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, China
Key Laboratory of Advanced Materials Design and Additive Manufacturing of Jiangsu Province, Changzhou 213001, China
Author to whom correspondence should be addressed.
Received: 18 July 2018 / Revised: 9 August 2018 / Accepted: 12 August 2018 / Published: 18 August 2018
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The effects of the extrusion process and CaO addition amount on microstructure, mechanical, and corrosion properties of AZ31 alloys were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), standard tensile testing, and so on. The grain size of AZ31 or AZ31-1%CaO alloy becomes larger with increasing extrusion temperature. The grain size of AZ31-1%CaO alloy is much smaller than that of AZ31 alloy at the same extrusion temperature. In addition, the formation of the Al2Ca phase caused by CaO addition refines the grain size, and the recrystallization of AZ31-1%CaO alloy is improved significantly. The recrystallization grains distribute more uniformly as the increase of extrusion ratio, and the completely recrystallized grains distribute uniformly in the form of equiaxed crystals with an extrusion ratio of 9. Tensile testing results show that extruded AZ31-1%CaO alloy at the extrusion temperature of 300 °C and an extrusion ratio of 9 exhibits the best mechanical properties. While corrosion properties of AZ31 alloys decreases due to the addition of CaO. View Full-Text
Keywords: AZ31-xCaO alloy; microstructures; mechanical properties; corrosion properties AZ31-xCaO alloy; microstructures; mechanical properties; corrosion properties

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Lu, Y.; Zhang, Y.; Cong, M.; Li, X.; Xu, W.; Song, L. Microstructures, Mechanical and Corrosion Properties of the Extruded AZ31-xCaO Alloys. Materials 2018, 11, 1467.

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