Kumar G B Veeresh, Pramod R, Sekhar Ch Guna, Kumar G Pradeep, Bhanumurthy T
Department of Mechanical Engineering, National Institute of Technology - Andhra Pradesh, Tadepalligudem, Andhra Pradesh, India.
Department of Mechanical Engineering, Amrita School of Engineering, Bengaluru Campus, Amrita Vishwa Vidyapeetham, India.
Heliyon. 2019 Nov 19;5(11):e02858. doi: 10.1016/j.heliyon.2019.e02858. eCollection 2019 Nov.
The present investigation mainly concentrates on work done in order to explore physical, mechanical & tribological characteristics of Al6061 alloy reinforced with nano-sized zirconium dioxide particulates. Four casts of different percentages of reinforcement from 0 to 6 wt% in the steps of 2 are fabricated using liquid metallurgy technique (stir casting). The prepared composites later subjected to various physical, mechanical & wear tests and results were studied. The tests were carried out in accordance with the ASTM standards on the alloy and nano-composites. In the present investigation the physical and mechanical properties like density, hardness and tensile strength increased significantly with the increase in percentage of reinforcement in the matrix alloy, while the percentage elongation found to be decreased. The sliding wear tests were performed by using pin-on-disc the tribometer and results indicated that wear resistance of composites was higher. Off the four compositions, there were improved properties of composites with higher weight percent of reinforcement. Scanning Electron Microscope (SEM) micrographs was used after tensile testing to study fractured surfaces of specimens and wear morphology after wear testing. Overall the investigational outcomes are very interesting and motivates to do further more research.
本研究主要集中于为探索纳米二氧化锆颗粒增强的Al6061合金的物理、机械及摩擦学特性所开展的工作。采用液态冶金技术（搅拌铸造法）制备了四组不同增强百分比（从0到6重量百分比，步长为2）的铸件。随后对制备的复合材料进行各种物理、机械及磨损测试，并对结果进行研究。这些测试是按照ASTM标准在合金和纳米复合材料上进行的。在本研究中，诸如密度、硬度和拉伸强度等物理和机械性能随着基体合金中增强物百分比的增加而显著提高，而伸长率百分比则有所下降。滑动磨损测试是使用销盘式摩擦计进行的，结果表明复合材料的耐磨性更高。在这四种成分中，增强物重量百分比更高的复合材料具有更好的性能。拉伸试验后使用扫描电子显微镜（SEM）照片来研究试样的断裂表面以及磨损试验后的磨损形态。总体而言，研究结果非常有趣，并促使人们开展更多的进一步研究。
