Microstructure and Corrosion Behavior of Al-Cu-Fe Quasi-crystalline Coated Ti-۶Al-۴V Alloy

Different industries, including aerospace, marine, and automotive, widely use titanium alloys such as Ti-۶Al-۴V. Although, this alloy has excellent properties; it is highly susceptible to corrosion and has low thermal stability and tribological characteristics, limiting its application. In this research, after preparing the Al۶۲.۵Cu۲۵Fe۱۲.۵ quasi-crystalline (QC) powder mixture and appropriate target, the magnetron sputtering method was employed to deposit the QC coating on the Ti-۶Al-۴V substrate. The powder mixture and AlCuFe thin films were annealed at ۷۰۰۰C for ۲ h. The scanning electron microscope (SEM) analysis and X-ray diffraction (XRD) methods were used to investigate the microstructure and morphology of mixed powders and Al-Cu-Fe QC coatings. NaCl solution (۳.۵ wt.%) was utilized to conduct the electrochemical measurements. Al-Cu-Fe thin layer deposited on the Ti-۶Al-۴V alloy surface without any cracks. The XRD patterns related to the annealed powders and the coating after heat treatment indicated the presence of Cu۳Al, AlFe۳, and quasi-crystalline ternary phases of Al۶۵Cu۲۰Fe۱۵, Al۳Fe, AlTi۲, and Al۶۵Cu۲۰Fe۱۵ phases, respectively. Based on the polarization test results, the annealed coating at ۷۰۰°C showed better electrochemical behavior than the Ti-۶Al-۴V substrate.

کلیدواژه ها:

Al۶۵Cu۲۰Fe۱۵ phase ، Corrosion Resistance ، Quasicrystals ، Thin film ، Ti-۶Al-۴V alloy