Comparison of wear behaviour of LM13 Al−Si alloy based composites reinforced with synthetic(B_(4)C)and natural(ilmenite)ceramic particles  

合成B_(4)C和天然钛铁矿陶瓷颗粒增强LM13铝硅合金基复合材料的磨损性能对比

作　　者：Rahul GUPTA Tarun NANDA O.P.PANDEY Rahul GUPTA;Tarun NANDA;O.P.PANDEY(Mechanical Engineering Department,Thapar Institute of Engineering and Technology,Patiala 147004,Punjab,India;School of Physics and Materials Science,Thapar Institute of Engineering and Technology,Patiala 147004,Punjab,India)

机构地区：[1]Mechanical Engineering Department,Thapar Institute of Engineering and Technology,Patiala 147004,Punjab,India [2]School of Physics and Materials Science,Thapar Institute of Engineering and Technology,Patiala 147004,Punjab,India

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第12期3613-3625,共13页中国有色金属学报（英文版）

摘　　要：Dry sliding wear behaviour of stir-cast aluminium matrix composites(AMCs)containing LM13 alloy as matrix and ceramic particles as reinforcement was investigated.Two different ceramic particle reinforcements were used separately:synthetic ceramic particles(B_(4)C),and natural ceramic particles(ilmenite).Optical micrographs showed uniform dispersion of reinforced particles in the matrix material.Reinforced particles refined the grain size of eutectic silicon and changed its morphology to globular type.B_(4)C reinforced composites(BRCs)showed maximum improvement in hardness of AMCs.Ilmenite reinforced composites(IRCs)showed maximum reduction in coefficient of friction values due to strong matrix−reinforcement interfacial bonding caused by the formation of interfacial compounds.Dry sliding wear behaviour of composites was significantly improved as compared to base alloy.The low density and high hardness of B_(4)C particles resulted in high dislocation density around filler particles in BRCs.On the other hand,the low thermal conductivity of ilmenite particles resulted in early oxidation and formation of a tribo-layer on surface of IRCs.So,both types of reinforcements led to the improvement in wear properties of AMCs,though the mechanisms involved were very different.Thus,the low-cost ilmenite particles can be used as alternative fillers to the high-cost B_(4)C particles for processing of wear resistant composites.研究以LM13铝硅合金为基体、陶瓷颗粒为增强相,采用搅拌铸造法制备的复合材料(AMCs)的干滑动磨损行为。分别采用两种不同的陶瓷颗粒增强相:合成的B_(4)C和天然的钛铁矿陶瓷颗粒。光学显微镜结果显示,增强颗粒均匀分散在基体材料中,增强颗粒使共晶硅的晶粒尺寸细化,形貌变为球形。B_(4)C增强复合材料(BRCs)的硬度提高最大,而钛铁矿增强复合材料(IRCs)由于界面化合物的形成导致基体−增强相界面结合较强,摩擦因数降低最大。与基体合金相比,复合材料的干滑动磨损性能显著提高。B_(4)C颗粒的低密度和高硬度导致BRCs中颗粒周围高的位错密度。另一方面,钛铁矿颗粒的低热导率导致IRCs表面发生早期氧化并形成摩擦层。可见,尽管两种类型的增强相的作用机制存在很大不同,他们都能改善AMCs的耐磨性能。因此,低成本钛铁矿颗粒可替代高成本B_(4)C颗粒,制备耐磨复合材料。

关 键 词：aluminium matrix composites ILMENITE boron carbide PARTICLE-REINFORCEMENT wear test TRIBOLAYER XRD analysis SEM−EDS 

分 类 号：TB333[一般工业技术—材料科学与工程]