Preparation and microstructural characterization of the 60Al-40V master alloy

Aluminothermic reaction process was used to produce the 60Al-40V master alloy from pure Al metal and vanadium pentoxide (V2O5). Material characterization techniques including light optical microscopy (LOM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were employed to analyse the microstructural, chemical composition and phases present in the alloy. Thermal analysis was carried out on the alloy using simultaneous differential scanning calorimetry and thermogravimetry (DSC-TG) analysis to determine the phase transformations. The microstructural analysis through both LOM and SEM indicated that the starting material consisted of the columnar dendritic structure. After the double heating cycle during the DSC-TG tests, the dendrite structure transformed to the globular structure. The globularization was attributed to the dendrite fragmentation obtained when heating the as-cast materials in the solidliquid region. This globular shape playing a positive role in enhancing the properties of the alloy. Through DSC-TG analysis, different peaks of transition temperatures were detected showing that the phase transformations occurred during the heating and cooling processes. The Al-rich phase (Al21V2) did not dissolve during homogenization. However, the intermetallic Al8V5 phase transformed to the Al3V phase during cooling. The chemical analysis of the produced master alloy was found to be 63 Al and 37 wt. % V. The phases in the alloy were principally identified to be Al3V and Al8V5 intermetallic phases. The analysis of the results shows that the most stable phase found at high temperature was the Al3V phase.

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Microstructures and Phases Analysis of the 60Al-40V Master Alloy Produced by the Aluminothermic Process

Mapoli

Mutombo

Annan

et al. 2022

Metallogr. Microstruct. Anal.

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New Approach for Manufacturing Ti–6Al–4V+40%TiC Metal-Matrix Composites by 3D Printing Using Conic Electron Beam and Cored Wire. Pt. 1: Main Features of the Process, Microstructure Formation and Basic Characteristics of 3D Printed Material

2023

Prog. Phys. Met.

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In this paper, a new approach for additive manufacturing metal-matrix composites based on Ti–6Al–4V titanium alloy reinforced with titanium carbide particles, as well as layered structures consisted of such composite and Ti–6Al–4V alloy layers is considered. The approach is based on 3D printing with a conical electron beam using a special cored wire, whose composition corresponds to metal-matrix composite. The issues of production such a wire, the features of the 3D printing process, when using it, as well as the features of formation of the microstructure and phase composition of the printed composite material are described. The issues of titanium-carbide particles’ wetting with Ti–6Al–4V melt during process of 3D printing, as well as possible thermogravitational effects (floating or drowning) for solid TiC particles within the melt are considered in detail with additional experiments. The influence of individual components of the wire composition on the formation of the microstructure and its uniformity over the cross section of the printed layer is shown. The possibility of controlling the formation of homogeneous structural state and obtaining sufficiently high values of the hardness (of above 600 HV) of the metal-matrix composite layer printed on the Ti–6Al–4V baseplate is shown.

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Preparation and microstructural characterization of the 60Al-40V master alloy

Cited by 2 publications

References 6 publications

Microstructures and Phases Analysis of the 60Al-40V Master Alloy Produced by the Aluminothermic Process

Microstructures and Phases Analysis of the 60Al-40V Master Alloy Produced by the Aluminothermic Process

New Approach for Manufacturing Ti–6Al–4V+40%TiC Metal-Matrix Composites by 3D Printing Using Conic Electron Beam and Cored Wire. Pt. 1: Main Features of the Process, Microstructure Formation and Basic Characteristics of 3D Printed Material

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