Effect of TiB2 Particles on the Morphological, Mechanical and Corrosion Behaviour of Al7075 Metal Matrix Composite Produced Using Stir Casting Process
Effect of TiB2 Particles on the Morphological, Mechanical and Corrosion Behaviour of Al7075 Metal Matrix Composite Produced Using Stir Casting Process
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TiB2 颗粒对搅拌铸造 Al7075 金属基复合材料形态、力学和腐蚀行为的影响
DOI：
10.1007/s40962-021-00696-3
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发表时间：
2021
影响因子：
2.6
通讯作者：
V. Mugendiran
中科院分区：
文献类型：
--
作者：
M. Manoj;G. R. Jinu;J. Kumar;V. Mugendiran
铝基复合材料是一种轻质高性能材料，主要应用于航空航天、汽车和船舶等领域。本文研究了不同质量分数的TiB 2颗粒对Al 7075金属基复合材料的形态、力学性能和腐蚀性能的影响。采用搅拌铸造法制备了3-5 μm尺寸的TiB 2陶瓷颗粒增强Al 7075-TiB 2复合材料。在机械搅拌器的帮助下，具有不同重量百分比2、4、6和8的颗粒被均匀地增强。能量色散X射线衍射（EDAX）图谱证实了复合材料中TiB 2颗粒的存在。SEM和光学显微镜观察表明，TiB 2颗粒在铝基体中分布均匀。TiB 2颗粒的加入提高了复合材料的抗拉强度和显微硬度，这是由于增强颗粒与基体之间具有较强的界面和载荷分担作用。通过改变载荷和滑动距离进行干滑动磨损试验。磨损表面的SEM显微结构表明，TiB 2颗粒的加入降低了磨损率，由于更硬，更强的增强颗粒的存在。采用动电位极化曲线和盐雾试验研究了Al-TiB 2复合材料的腐蚀行为。SEM微观结构证实了点蚀的发生，并表明TiB 2颗粒的加入提高了耐腐蚀性能。
Aluminium metal matrix composites are lightweight high-performance materials mostly applicable in aerospace, automobile and marine applications. In this study, the morphological, mechanical and corrosion behaviour of Al7075 metal matrix composites were investigated to find the effect of reinforcement of TiB2particles for various weight percentage. Al7075-TiB2composites were developed by reinforcing the 3–5 µm size TiB2ceramic particles using stir casting process. The particles with different weight percentage of 2, 4, 6 and 8 were uniformly reinforced with the help of the mechanical stirrer. The energy dispersive X-ray diffraction (EDAX) pattern confirms the presence of TiB2particles in the composites. SEM and optical microstructures clearly revealed the uniform distribution of TiB2particles in the aluminium matrix. The additions of TiB2particles enhance the tensile strength and micro hardness due to the strong interface and load sharing between the matrix and the reinforcement particles. Dry sliding wear test was conducted by varying the applied load and sliding distance. SEM microstructure of worn surfaces shows that addition of TiB2particles decreases the wear rate due to the presence of stiffer and stronger reinforcement particles. The electrochemical potentiodynamic polarization and salt spray test were also conducted to study the corrosion behaviour of the Al-TiB2composites. SEM microstructures confirm the occurrence of pitting corrosion and shows that addition of TiB2particles improves the corrosion resistance.