The arc-spray-coated Q235/AZ91D bimetallic material was fabricated via casting the molten magnesium alloy into the mold where arc-spray-coated Q235 had been inserted to realize the light weight with optimal mechanical properties. The microstructure and mechanical properties of arc-spray-coated Q235/AZ91D bimetallic material were investigated in this study. Results revealed that the interface zone between Q235 and AZ91D could be divided into two different layers: the layer close to AZ91D and the layer adjacent to Q235. The layer close to AZ91D was composed of α-Mg and Al₅Mg₁₁Zn₄, and the layer adjacent to Q235 was comprised of α-Mg, FeAl₃ and MgAl₂O₄. Due to the inhomogeneous distribution of magnesium, aluminum and zinc elements, the white phase in the layer adjacent to AZ91D displayed several different morphologies including ellipse, strip and mesh, resulting in the variation of hardness from 152.3HV to 332.4HV. In addition, the generation of MgAl₂O₄ and FeAl₃ caused the hardness of the layer close to AZ91D to reach 332.6HV. What is more, the shear test indicated the shear strength of arc-spray-coated Q235/AZ91D bimetallic material was much better than the bare Q235/AZ91D bimetallic material, which was attributed to the formation of metallurgical bonding.

中文翻译：

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固液复合铸造电弧喷涂Q235 / AZ91D的组织和力学性能研究

电弧喷涂Q235 / AZ91D双金属材料是通过将熔融的镁合金浇铸到已插入电弧喷涂Q235的模具中而制成的，从而实现了轻量化和最佳机械性能。研究了电弧喷涂Q235 / AZ91D双金属材料的微观结构和力学性能。结果表明，Q235和AZ91D之间的界面区域可分为两个不同的层：靠近AZ91D的层和靠近Q235的层。靠近AZ91D的层由α-Mg和Al ₅ Mg ₁₁ Zn _4组成，与Q235相邻的层由α-Mg，FeAl ₃和MgAl ₂ O _4组成。。由于镁，铝和锌元素的不均匀分布，与AZ91D相邻的层中的白相显示出几种不同的形貌，包括椭圆形，条形和网状，从而使硬度从152.3HV变为332.4HV。另外，MgAl ₂ O ₄和FeAl _3的产生使接近AZ91D的层的硬度达到332.6HV。而且，剪切试验表明，电弧喷涂的Q235 / AZ91D双金属材料的剪切强度比裸露的Q235 / AZ91D双金属材料要好得多，这归因于冶金结合的形成。