Effect of Interlayer Cooling Time on the Microstructure and Mechanical Properties of Alloy Amalgamation in Multilayer Titanium Alloys
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This study explores the concept of “alloy amalgamation”, which involves blending multiplecommercial alloys during the Additive Manufacturing (AM) process to design innovative titanium alloys. Specifically, this research investigates the effect of varying interlayer cooling times on the microstructure and mechanical properties of these alloys. The binary alloy chosen for this research is a mixture of ($\alpha$+$\beta$ and $\beta$-Ti alloy). Two multilayer binary titanium alloys of the same composition were printed using the Laser-Directed Energy Deposition method, with interlayer cooling times of 10 and 5 seconds. Detailed microscopy and x-ray diffraction studies revealed the phase distribution and morphology of the martensitic $\alpha$’, $\alpha$’’ and $\beta$ phases. Through mechanical testing, it was found that the 10-second sample failed at much lower strain values compared to the 5-second sample. The enhanced ductility in the latter was attributed to retention of more metastable $\beta$ phase, which facilitated the transformation-induced plasticity (TRIP) during deformation. This study emphasizes the importance of thermal history on phase fraction and performance of alloy amalgamation.