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

机译：正交设计优化Mg-Al-Sn-Mn合金的成分和力学性能

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摘要

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%).
机译：通过正交试验设计了9种无稀土Mg-Al-Sn-Mn镁合金。进行了扫描电子显微镜（SEM），能量色散谱（EDS），X射线衍射（XRD），电子背散射衍射（EBSD）和拉伸试验，以研究显微组织和力学性能。铸态的Mg-Al-Sn-Mn合金具有明显的树枝状结构，由α-Mg，Mg17Al12和Mg2Sn相组成。热挤压后，铸造的枝晶结构变为重结晶的等轴晶。 Mg17Al12完全溶解在基质中，只能观察到α-Mg，Mg2Sn和少量Al-Mn相。通过极差分析法研究了三种合金元素（Al，Sn和Mn）对晶粒尺寸，织构强度，极限抗拉强度（UTS），抗拉屈服强度（TYS）和延伸率（EL）的影响。 Mn含量对晶粒尺寸的影响最大。 AT61-0.2Mn和AT73-0.2Mn合金的晶粒最小，达到6.8μm。 Al的含量对强度的影响最大。因此，AT73-0.2Mn合金的UTS最高，为322 MPa，TYS为202 MPa。 Sn的含量对伸长率的影响最大。从理论上讲，AT52-0.4Mn合金的延伸率最高，但尚不包括在9种设计合金中。在这九种合金中，AT52-0.2Mn合金的延伸率最高（28.4％）。

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