Abstract
Laser modification techniques have been widely adopted in the field of surface engineering. Among these modified techniques, ultra-high-speed laser cladding is trending most nowadays to fabricate wear-resistant surfaces. The main purpose of this research is to provide a detailed insight of ultra-high-speed laser cladding of hard Ni60 alloy on LA43M magnesium alloy to enhance its surface mechanical properties. Multiple processing parameters were investigated to obtain the optimal result. The synthesized coating was studied microstructurally by field emission scanning electron microscopy (FESEM) equipped with an energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The microhardness and wear resistance of the Ni60 coating were analyzed under Vickers hardness and pin on disc tribometer respectively. The obtained results show that the dense Ni60 coating was fabricated with a thickness of 300 μm. No cracks and porosities were detected in cross-sectional morphology. The Ni60 coating was mainly composed of γ-Ni and hard phases (chromium carbides and borides). The average microhardness of coating was recorded as 948 HV0.3, which is approximately eight times higher than that of the substrate. Meanwhile, the Ni60 coating exhibited better wear resistance than the substrate, which was validated upon the wear loss and wear mechanism. The wear loss recorded for the substrate was 6.5 times higher than that of the coating. The main wear mechanism in the Ni60 coating was adhesive while the substrate showed abrasive characteristics.
Highlights
Lightweight materials play a vital role towards different commercial and noncommercial applications from an economic perspective
The coated specimen was divided into three distinct regions: (1) a fully dense cladded coated region of Ni60 alloy with average thickness range between 260 to 300 μm, (2) a transition region lying beneath the dense Ni60 layer containing grain structure evolution and (3) a LA43M substrate region
This study concluded that Ni60 coating was successfully fabricated on a LA43M magnesium studybyconcluded that Ni60 coating successfully fabricated onfindings a LA43M
Summary
Lightweight materials play a vital role towards different commercial and noncommercial applications from an economic perspective. Magnesium-based alloys with lithium as the major alloying element are known as ultralight metallic structural materials. These alloys, in comparison with other materials, have significant low density of 1.25–1.65 g/cm , which is almost 50% of aluminum alloys and 75% of other magnesium alloys [1]. Magnesium lithium alloys are always considered a prime choice for applications in the aviation, aerospace, defense and 3C industries, because of their high stiffness, good magnetic shielding, high specific strength and damping capacity [2,3]. Coatings 2020, 10, 638 biomedicine and other civilian fields [4,5]. Their poor tribological properties greatly affected their popularity and reduced usage in different applications
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