Design and Effect of Resonant Ultrasonic Vibration-Assisted Laser Cladding (R-UVALC) on AlCrFeMnNi High-Entropy Alloy

Author:

Mohsan Aziz Ul Hassan12ORCID,Zhang Mina1,Wang Dafeng3,Wang Yishen1,Zhang Jiahao1ORCID,Zhou Yanyuan1ORCID,Li Yifei1,Zhao Su1

Affiliation:

1. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

2. International College, University of Chinese Academy of Sciences, Beijing 101408, China

3. Ningbo Branch of Chinese Academy of Ordnance Science, Ningbo 315103, China

Abstract

The design of the resonant ultrasonic vibration-assisted laser cladding (R-UVALC) setup involved employing finite element analysis (FEA) to simulate the ultrasonic transducer, horn, and workpiece in a resonance state. The impact of R-UVALC on AlCrFeMnNi high-entropy alloys was assessed using various ultrasonic vibration amplitudes of 0, 5, 10, and 15 µm, with a constant frequency of 20 kHz. Ultrasonic vibrations reduced pores and cracks and increased the clad breadth, melt pool wetting angle, and laser-clad layer consistency. The columnar elongated grains in proximity to the substrate surface underwent a size reduction and transformed into grains with a more equiaxed shape with the utilization of ultrasonic vibrations at an amplitude of 5 µm. Laser cladding performed without ultrasonic vibrations yields two phases: face-centered cubic (FCC) and body-centered cubic (BCC). However, when the coating is exposed to ultrasonic vibrations with an amplitude of 5 µm, it forms a solitary body-centered cubic (BCC) phase. The microhardness tripled compared to the substrate, and the most significant microhardness value was achieved at 5 µm of ultrasonic vibration. The friction coefficient was assessed at an ambient temperature, revealing that an ultrasonic amplitude yields the lowest friction coefficient, demonstrating the excellent wear resistance properties of the coating. The analysis of the 3D surface profile of the wear indicates that the use of ultrasonic aid with a 5 µm amplitude leads to reduced depth of scars, and the primary wear mechanism observed is abrasive and oxidative wear with fewer grooves and debris. In addition, XPS analysis revealed the presence of metal components in an oxidized condition, suggesting that the wear process is oxidative in nature. Integrating the R-UVALC setup into a resonance state can significantly enhance the efficiency of the laser cladding process in the laser cladding field.

Funder

the “Ningbo Science and Technology Innovation 2025” Major Special Project

the Foundation of Director of Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences

the Natural Science Foundation of Inner Mongolia

the Natural Science Foundation of Ningbo

the “China Postdoctoral Science Foundation

the “Pioneer” and “Leading Goose” R&D Program of Zhejiang

Chinese Academy of Sciences (CAS) and The World Academy of Sciences

Publisher

MDPI AG

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