Intermetallics and Advanced Alloy Properties
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Abstract
Abstract
Titanium aluminide (Ti-Al) has attracted attentions for applications in aerospace and automotive industries due to their unique properties such as low density, high stiffness and high specific strength at ambient and elevated temperatures. However, the ubiquitous manufacturing of components by conventional processing techniques is hindered by the inherent brittleness of TiAl-based alloys at ambient temperature making it difficult to process this type of alloy, thus, restricting their wider application. Moreover, the direct energy deposition (DED) is amenable to surface modifications and manufacturing of near-net shaped part of difficult-to-process materials. Therefore, this study examines Ti-Al-Si-x(Mo+V) alloys produced from elemental powders via laser in-situ alloying through DED technique using the laser engineered net shaping (LENS) machine. The focus of this investigation was to examine the influence of heat treatment on the alloys at varied Mo+V feed rates after laser in-situ alloying. Isothermal annealing heat treatment, was performed at 1150 °C for 15 min, 30 min, and 60 min, and at 1200 °C, 1300 °C, and 1400 °C for 60 min and furnace cooled (FC), followed by homogenization heat treatment at 950 °C for 6 hours and FC. It was observed that the microstructure revealed relatively large β 0 -phase precipitates within the lamellae and α 2 +γ lamellae colony boundaries. It was deduced that the presence of ζ-Ti 5 Si 3 causes an increase in the alloys’ microhardness, which is notable after heat treatment at 1150 °C and 1200 °C, with microstructures of columnar and duplex phases, respectively.
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@article{Raji2026Microstructural,
title = {Microstructural and Microhardness Properties of <i>In Situ</i> Direct Energy Deposition Fabricated Ti-Al-Si-X(Mo+V) Alloys after Isothermal Annealing Heat Treatments},
author = {Sadiq Abiola Raji and Abimbola Patricia Idowu Popoola},
journal = {Key engineering materials},
year = {2026},
doi = {10.4028/p-kav0x8},
url = {https://doi.org/10.4028/p-kav0x8}
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