Thankachan Titus, Prakash K Soorya, Kavimani V, Zhou Wenbin
Department of Mechanical Engineering, Karpagam college of Engineering, Coimbatore, 641 032, India.
Department of Mechanical Engineering, Anna University Regional campus, Coimbatore, 641 046, India.
Heliyon. 2024 Apr 26;10(9):e30173. doi: 10.1016/j.heliyon.2024.e30173. eCollection 2024 May 15.
This research investigates the impact of hybrid particles dispersed onto the surface of a copper matrix using Friction Stir Processing (FSP) on its microstructural, mechanical, and corrosion behavior. The hybrid particles under study consist of equal fractions of Aluminium Nitride (AlN) and Boron Nitride (BN). Microstructural characterization confirms breakdown of grain size due to dynamic recrystallization and presence of particles, along with their effective bonding to copper matrix. Attained results indicated a significant enhancement in hardness, with an increase of up to 3.9 % upon the introduction of particles onto the surface. Moreover, the tensile properties exhibit noticeable improvements in terms of ultimate tensile strength (6.39 %) and yield strength (6.12 %), albeit at the expense of reduced ductility in the copper matrix. Furthermore, the wear rate (decreases up to 22 %) and corrosion rate of the developed composites demonstrate a decreasing trend with the introduction of particles. This improvement can be attributed to the reduction in grain size during the FSP process and the formation of a nitride passive layer facilitated by the reinforced hybrid particles, thereby effectively inhibiting the corrosion rate.
本研究调查了采用搅拌摩擦加工（FSP）将混合颗粒分散到铜基体表面后，对其微观结构、力学性能和腐蚀行为的影响。所研究的混合颗粒由等比例的氮化铝（AlN）和氮化硼（BN）组成。微观结构表征证实，由于动态再结晶和颗粒的存在，晶粒尺寸减小，同时颗粒与铜基体有效结合。所得结果表明，硬度显著提高，在表面引入颗粒后硬度增加高达3.9%。此外，拉伸性能在极限抗拉强度（6.39%）和屈服强度（6.12%）方面有显著改善，尽管这是以铜基体延展性降低为代价的。此外，所制备复合材料的磨损率（降低高达22%）和腐蚀速率随着颗粒的引入呈下降趋势。这种改善可归因于搅拌摩擦加工过程中晶粒尺寸的减小以及增强混合颗粒促进形成的氮化物钝化层，从而有效抑制了腐蚀速率。
