Wang Xin, Zhao Lichen, Hu Ximei, Cheng Yongjian, Liu Shuiqing, Chen Peng, Cui Chunxiang
Key Laboratory for New Type of Functional Materials in Hebei Province, School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
Materials (Basel). 2017 Nov 30;10(12):1371. doi: 10.3390/ma10121371.
Magnesium-based bulk metallic glass matrix composites (BMGMCs) have better plasticity than the corresponding bulk metallic glasses (BMGs); however, their strength and density are often compromised due to the fact that the effective reinforcement phase is mostly plastic heavy metal. For lightweight SiC-particle reinforced BMGMCs, interface wettability and the sharpness of the particles often reduce the strengthening effect. In this work, SiC particles were coated with a thin Cu coating by electroless plating, and added to MgCuAgGd melt in an amount of 5 wt % to prepare a BMGMC. The microstructure of the interface, mechanical behavior and fracture morphology of the BMGMC were studied by scanning electron microscopy and quasi-static compression testing. The results showed that the Cu coating improved the wettability between SiC and the matrix alloy without obvious interfacial reactions, leading to the dispersion of SiC particles in the matrix. The addition of Cu-coated SiC particles improved the plastic deformation ability of MgCuAgGd BMG, proving that electroless plating was an effective method for controlling the interface microstructure and mechanical behavior of BMGMCs.
镁基块状金属玻璃基复合材料（BMGMCs）比相应的块状金属玻璃（BMGs）具有更好的塑性；然而，由于有效的增强相大多是塑性重金属，它们的强度和密度常常受到影响。对于轻质碳化硅颗粒增强的BMGMCs，界面润湿性和颗粒的尖锐度常常会降低强化效果。在这项工作中，通过化学镀在碳化硅颗粒上涂覆一层薄铜涂层，并以5 wt%的量添加到MgCuAgGd熔体中制备BMGMC。通过扫描电子显微镜和准静态压缩试验研究了BMGMC的界面微观结构、力学行为和断裂形态。结果表明，铜涂层提高了碳化硅与基体合金之间的润湿性，且无明显界面反应，导致碳化硅颗粒在基体中分散。添加镀铜碳化硅颗粒提高了MgCuAgGd BMG的塑性变形能力，证明化学镀是控制BMGMC界面微观结构和力学行为的有效方法。
