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Effect of Electropulsing-Assisted Ultrasonic Nanocrystalline Surface Modification on the Surface Mechanical Properties and Microstructure of Ti-6Al-4V Alloy

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Abstract

The effect of electropulsing-assisted ultrasonic nanocrystalline surface modification (EP-UNSM) on surface mechanical properties and microstructure of Ti-6Al-4V alloy is investigated. Compared to conventional ultrasonic nanocrystalline surface modification (UNSM), EP-UNSM can effectively facilitate surface roughness and morphology, leading to excellent surface roughness (reduced from Ra 0.918 to Ra 0.028 μm by UNSM and Ra 0.019 μm by EP-UNSM) and smoother morphology with less cracks and defects. Surface friction coefficients are enhanced, resulting in lower and smoother friction coefficients. In addition, the surface-strengthened layer and ultra-refined grains are significantly enhanced with more severe plastic deformation and a greater surface hardness (a maximum hardness value of 407 HV and an effective depth of 550 μm, in comparison with the maximum hardness value of 364 HV and effective depth of 300 μm obtained by conventional UNSM). Remarkable enhancement of surface mechanical properties can be attributed to the refined gradient microstructure and the enhanced severe plastic deformation layer induced by coupling the effects of UNSM and electropulsing. The accelerated dislocation mobility and atom diffusion caused by the thermal and athermal effects of electropulsing treatment may be the primary intrinsic reasons for these improvements.

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Acknowledgments

The authors wish to acknowledge the financial support from the Guangdong Science and Technology Plan Project (2014B090901029), the Shenzhen Development and Reform Commission Engineering Laboratory Project (Shenzhen development and Reform 2015-1033), the Shenzhen Science and Technology supporting Plan Project (GJHS20160331183313435) and the project funded by China Postdoctoral Science Foundation (No. 2017M620770).

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Ye, Y., Wang, H., Tang, G. et al. Effect of Electropulsing-Assisted Ultrasonic Nanocrystalline Surface Modification on the Surface Mechanical Properties and Microstructure of Ti-6Al-4V Alloy. J. of Materi Eng and Perform 27, 2394–2403 (2018). https://doi.org/10.1007/s11665-018-3248-3

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  • DOI: https://doi.org/10.1007/s11665-018-3248-3

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