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Influence of different micro-pattern types on interface characteristic and mechanical property of CFRTP/aluminum alloy laser bonding joint

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Abstract

Laser direct joining of carbon fiber-reinforced thermoplastic composites (CFRTP) to aluminum alloy with diverse surface micro-patterns was performed. The influence of micro-pattern type on interface characteristic and mechanical property of CFRTP/aluminum alloy laser bonding joint was concerned especially. Prior to the laser joining, two different micro-patterns including groove structure and circular hole structure were fabricated on the metal surface using nanosecond pulsed laser. Then, the appearance of joint and the morphology at joining interface were observed by optical microscope and scanning electron microscope. Moreover, the tensile shear test was conducted to obtain the fracture load and fracture surface morphology. The results indicated that the cross section of the groove structure was a trapezoid, while that of the circular hole structure was a triangle with a large ratio of depth to diameter. In spite of the more pores existed at the interface of joints with circular hole structure, this type of micro-pattern strengthened the mechanical anchoring effect between CFRTP and aluminum alloy more significantly. With the change of micro-pattern from groove structure to circular hole structure, the maximum tensile load of laser bonding joint increased from 1616.40 to 2623.40 N, and the main failure mode transformed from interface failure to cohesive failure. The micro-pattern fabricated on the metal surface before the laser joining process is an effective approach to obtain the larger bonding area and higher mechanical strength of laser bonding joint.

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Authors and Affiliations

  1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China

    Feiyun Wang, Hengchang Bu, Jiebang Luo, Pingze Zhang, Leilei Wang & Xiaohong Zhan

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  1. Feiyun Wang
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  2. Hengchang Bu
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  3. Jiebang Luo
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  4. Pingze Zhang
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  5. Leilei Wang
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  6. Xiaohong Zhan
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Contributions

The material preparation, micro-pattern fabrication and the laser direct joining experiment were conducted by FW. Data processing and manuscript preparation were led by FW with contributions from all authors.

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Correspondence to Xiaohong Zhan.

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Wang, F., Bu, H., Luo, J. et al. Influence of different micro-pattern types on interface characteristic and mechanical property of CFRTP/aluminum alloy laser bonding joint. Int J Adv Manuf Technol 120, 3543–3557 (2022). https://doi.org/10.1007/s00170-022-08748-6

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  • DOI: https://doi.org/10.1007/s00170-022-08748-6

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