Surface Improvement of Ti-6Al-4V Alloy by Deposition of AlCrCoFeMnNi High Entropy Alloy Using TIG Process

A high entropy alloy layer from AICrCoFeMnNi powders was formed on the surface of the Ti-6A1-4V alloy using the tungsten inert gas (TIG) cladding process to improve the surface properties of the alloy. The design of the experiments using the Taguchi method was used to estimate the surface hardness a...

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Bibliographic Details
Published in:JOM (1989) 2024-02, Vol.76 (2), p.656-666
Main Authors: Alazzawi, Falih, Aghajani, Hossein, Kianvash, Abbas
Format: Article
Language:English
Subjects:
Adhesive wear
Alloys
Aluminum
Argon
Body centered cubic lattice
Cladding
Corrosion resistance
Dendritic structure
Diamond pyramid hardness
Entropy
Face centered cubic lattice
Flow velocity
Gas flow
High entropy alloys
Interdendritic structure
Intermetallic compounds
Lasers
Mechanical properties
Optical microscopy
Oxidation
Polyvinyl alcohol
Precipitates
Process parameters
Rare gases
Scanning electron microscopy
Stainless steel
Surface hardness
Surface properties
Taguchi methods
Titanium base alloys
Wear resistance
Welding current
Welding parameters
X-ray diffraction
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Summary:A high entropy alloy layer from AICrCoFeMnNi powders was formed on the surface of the Ti-6A1-4V alloy using the tungsten inert gas (TIG) cladding process to improve the surface properties of the alloy. The design of the experiments using the Taguchi method was used to estimate the surface hardness against the TIG process parameters like the welding current, scanning speed, and shielding gas flow rate. Optical microscopy (OM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were used to characterize the deposited layer. A Vickers hardness tester was used to evaluate the microhardness of the cladding layer. The results showed that the optimum level of the process parameters that produced high surface hardness was at a current of 50 A, a scanning speed of 0.8 mm/s, and an argon flow rate of 12 L/min. The XRD analysis of the cladding layers revealed that all the layers were composed of BCC and FCC. The examinations of OM and SEM showed that the cladding layers tend to have a dendritic structure consisting of FCC + BCC/B2 and weave-like BCC/ B2 precipitates with a small amount of Cr/Fe-cr phase in the interdendritic structure.
ISSN:1047-4838
DOI:10.1007/sll837-023-06314-3