Abstract
Abstract The current study demonstrates the feasibility of mechanical alloying (MA) and plasma spheroidization (PS) processes to produce highly-spherical Ti-22Al-25Nb-0.3Mo-1Zr-0.3Si-0.2Hf-0.4Ta (at.%) orthorhombic alloy powders. The microstructure, chemical homogeneity and phase evolution of the obtained powders at different times of milling and after plasma spheroidization were investigated using X-Ray Diffraction and Scanning Electron Microscopy methods. MA at short milling times resulted in powders with highly inhomogeneous layered microstructures with HPC- and BCC-crystal structures. Increasing the milling time promoted the formation of B2/β-phase solid solution and improved the chemical homogeneity. PS of the fabricated irregular powders allowed to produce powders of the orthorhombic alloy with homogeneous chemical composition and a high degree of sphericity with the microstructure consisting of dendritic B2-phase.
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