Interfacial structure and bonding mechanism of AZ31/carbon-fiber-reinforced plastic composites fabricated by thermal laser joining
| Autor: | Mokyoung Lee, Youn Seoung Lee, Barton Mensah Arkhurst, Jeoung Han Kim, Jae Bok Seol |
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| Rok vydání: | 2019 |
| Předmět: |
Thermal oxidation
Materials science Scanning electron microscope Mechanical Engineering Alloy Plastic joining 02 engineering and technology Atom probe engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences law.invention Lap joint X-ray photoelectron spectroscopy Mechanics of Materials Transmission electron microscopy law Ceramics and Composites engineering Composite material 0210 nano-technology |
| Zdroj: | Composites Part B: Engineering. 167:71-82 |
| ISSN: | 1359-8368 |
| DOI: | 10.1016/j.compositesb.2018.12.002 |
| Popis: | Multi-material joining is attracting the attention of the automotive industry given its potential to realize lighter vehicles, and therefore fuel savings and reduced emissions. The aim of the present study was to understand the bonding mechanisms whereby metal and plastic/composites are joined and to improve the multi-material joint strength. In this study, the effect of thermal oxidation of Mg alloy sheets on the strengths of Mg–CFRP (carbon-fiber-reinforced plastic) lap joints prepared using laser-assisted metal and plastic joining technique was investigated. Characterization techniques including scanning electron microscopy (SEM), transmission electron microscopy (TEM), micro-computed tomography (MCT), x-ray photoelectron spectroscopy (XPS), and atom probe tomography (APT) were used to study the underlying mechanisms of the thermal oxidation. The formation of bubbles, mechanical interlocking and chemical reactions at the joint interface were found to be the three key factors influencing the strength of joints. Thermal oxidation increased the joint strength significantly through the suppression of bubble formation, CFRP decomposition and the creation of mechanical interlocking effects at the joint interface. Moreover, MgCO3, MgO1+x, and Mg(OH)2 phases were detected by XPS analysis at the joints prepared using thermally oxidized Mg alloy sheets. The presence of the high O/Mg ratio phases was also confirmed by APT analysis. The formation of these phases confirmed the occurrence of chemical reactions between the MgO and CFRP matrix at the nanometer level, which are regarded as contributing to the increase in the joint strength. |
| Databáze: | OpenAIRE |
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