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Materials 2018, 11(8), 1424;

Composition Optimization and Mechanical Properties of Mg-Al-Sn-Mn Alloys by Orthogonal Design

College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
National Engineering Research Center for Magnesium Alloys, Chongqing 400044, China
Author to whom correspondence should be addressed.
Received: 4 July 2018 / Revised: 6 August 2018 / Accepted: 10 August 2018 / Published: 13 August 2018
(This article belongs to the Collection Textures and Anisotropy in Advanced Materials)
PDF [7060 KB, uploaded 13 August 2018]


Nine kinds of rare-earth free Mg-Al-Sn-Mn magnesium alloys were designed by orthogonal method. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), electron backscatter diffraction (EBSD), and tension tests were carried out to investigate the microstructures and mechanical properties. As-cast Mg-Al-Sn-Mn alloys have an obvious dendritic structure that is composed of α-Mg, Mg17Al12, and Mg2Sn phases. After hot extrusion, the cast dendrite structure changed into a recrystallized equiaxed grain. Mg17Al12 dissolved completely into a matrix, and only α-Mg, Mg2Sn, and a few Al-Mn phases could be observed. The influence of three alloy elements (Al, Sn, and Mn) on grain size, texture intensity, ultimate tensile strength (UTS), tensile yield strength (TYS), and elongation (EL) were studied by extreme difference analysis method. The content of Mn had the greatest influence on grain size. The AT61-0.2Mn and AT73-0.2Mn alloys had the smallest grain, reaching 6.8 μm. The content of Al had the greatest influence on the strength; therefore, the AT73-0.2Mn alloy had the highest UTS, 322 MPa, and TYS, 202 MPa. The content of Sn had the greatest influence on elongation. The AT52-0.4Mn alloy had the highest elongation in theory, but it was not included in the nine designed kinds of alloys yet. AT52-0.2Mn alloy had the highest elongation in the nine alloys (28.4%). View Full-Text
Keywords: magnesium alloys; orthogonal design; grain refinement; mechanical properties magnesium alloys; orthogonal design; grain refinement; mechanical properties

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Guan, M.; Hu, Y.; Zheng, T.; Zhao, T.; Pan, F. Composition Optimization and Mechanical Properties of Mg-Al-Sn-Mn Alloys by Orthogonal Design. Materials 2018, 11, 1424.

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