Tun Khin Sandar, Wong Wai Leong Eugene, Nguyen Quy Bau, Gupta Manoj
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore.
School of Mechanical and Systems Engineering, Newcastle University International Singapore (NUIS), 180 Ang Mo Kio Ave 8, 569830, Singapore.
Materials (Basel). 2013 May 7;6(5):1826-1839. doi: 10.3390/ma6051826.
In the present study, room temperature mechanical properties of pure magnesium, Mg/ZrO₂ and Mg/(ZrO₂ + Cu) composites with various compositions are investigated. Results revealed that the use of hybrid (ZrO₂ + Cu) reinforcements in Mg led to enhanced mechanical properties when compared to that of single reinforcement (ZrO₂). Marginal reduction in mechanical properties of Mg/ZrO₂ composites were observed mainly due to clustering of ZrO₂ particles in Mg matrix and lack of matrix grain refinement. Addition of hybrid reinforcements led to grain size reduction and uniform distribution of hybrid reinforcements, globally and locally, in the hybrid composites. Macro- and micro- hardness, tensile strengths and compressive strengths were all significantly increased in the hybrid composites. With respect to unreinforced magnesium, failure strain was almost unchanged under tensile loading while it was reduced under compressive loading for both Mg/ZrO₂ and Mg/(ZrO₂ + Cu) composites.
在本研究中，对具有不同成分的纯镁、Mg/ZrO₂ 和 Mg/(ZrO₂ + Cu) 复合材料的室温力学性能进行了研究。结果表明，与单一增强体（ZrO₂）相比，在镁中使用混合（ZrO₂ + Cu）增强体可提高力学性能。观察到 Mg/ZrO₂ 复合材料的力学性能略有下降，这主要是由于 ZrO₂ 颗粒在镁基体中团聚以及缺乏基体晶粒细化。添加混合增强体导致混合复合材料中晶粒尺寸减小以及混合增强体在整体和局部上的均匀分布。混合复合材料的宏观和微观硬度、拉伸强度和压缩强度均显著提高。相对于未增强的镁，在拉伸载荷下失效应变几乎不变，而对于 Mg/ZrO₂ 和 Mg/(ZrO₂ + Cu) 复合材料，在压缩载荷下失效应变均降低。
