Surface Topography: Metrology and Properties ( IF 2.7 ) Pub Date : 2021-08-12 , DOI: 10.1088/2051-672x/ac1915 Sudheer Reddy Beyanagari , Jayakrishna Kandasamy
AA7075 is used in several automobile applications due to its low density and better mechanical properties. However, the friction and wear properties of AA7075 are not up to the mark to extend its application for tribological applications. Hence, this present study focuses on improving the mechanical and wear properties of AA7075 through different reinforcements like h-BN and MoS2 nanoparticles. Two different composites namely AA7075/h-BN and hybrid AA7075/h-BN/MoS2 are produced using a stir-squeeze casting process by varying weight percentages of h-BN and MoS2 particles and their mechanical and tribological characteristics are compared. Physical characterization like morphology, phase structure, density, and porosity values are determined. The reinforcement of MoS2 and h-BN particles has modified the microstructure in terms of dendrite formation. Hardness is measured and correlated with the tensile strength of the developed composites. Maximum ultimate tensile strength (UTS) of 361.5 MPa is obtained for AA7075/h-BN composite as compared to hybrid AA7075/h-BN/MoS2 and AA7075. A higher hardness of 164.39 HV is attained for AA7075/1.0h-BN/0.5MoS2 composite as compared to AA7075/h-BN composites and AA7075. Tribological characterization is studied using the pin-on-disc apparatus at an applied load of 40 N, a sliding distance of 1000 m, and a sliding velocity of 2 m s−1. Higher delamination and adhesion wear exhibited by AA7075 is controlled with the reinforcements of h-BN and MoS2 nanoparticles. Comparatively, the hybrid AA7075/h-BN/MoS2 has shown better tribology behavior than the other composites. Additionally, the various wear mechanisms of AA7075/h-BN and hybrid AA7075/h-BN/MoS2 composites during the sliding are studied.
中文翻译:
AA7075/h-BN与AA7075/h-BN/MoS2杂化纳米复合材料搅拌挤压铸造的力学和摩擦学特性对比研究
AA7075 由于其低密度和更好的机械性能而被用于多种汽车应用。然而,AA7075 的摩擦和磨损性能并没有达到扩展其在摩擦学应用中的应用的标准。因此,本研究的重点是通过不同的增强材料(如 h-BN 和 MoS 2纳米粒子)来改善 AA7075 的机械和磨损性能。两种不同的复合材料,即 AA7075/h-BN 和混合 AA7075/h-BN/MoS 2是使用搅拌挤压铸造工艺通过改变 h-BN 和 MoS 2 的重量百分比生产的颗粒及其机械和摩擦学特性进行了比较。物理特性如形态、相结构、密度和孔隙率值被确定。MoS 2和 h-BN 颗粒的增强在枝晶形成方面改变了微观结构。测量硬度并将其与开发的复合材料的拉伸强度相关联。与混合 AA7075/h-BN/MoS 2和 AA7075相比,AA7075/h-BN 复合材料的最大极限拉伸强度 (UTS) 为 361.5 MPa 。AA7075/1.0h-BN/0.5MoS 2获得更高的硬度 164.39 HV与 AA7075/h-BN 复合材料和 AA7075 相比。使用销盘式装置在40 N 的施加载荷、1000 m 的滑动距离和2 ms -1的滑动速度下研究摩擦学特性。AA7075 表现出的更高的分层和粘附磨损是通过 h-BN 和 MoS 2纳米粒子的增强来控制的。相比之下,混合AA7075/h-BN/MoS 2表现出比其他复合材料更好的摩擦学行为。此外,还研究了 AA7075/h-BN 和混合 AA7075/h-BN/MoS 2复合材料在滑动过程中的各种磨损机制。