Factor which governs the feature of texture developed during additive manufacturing; clarified from the study on hexagonal C40-NbSi2

• Published in: Scripta materialia Vol. 203; p. 114111
• Main Authors: Hagihara, Koji, Ishimoto, Takuya, Suzuki, Masahiro, Ozasa, Ryosuke, Matsugaki, Aira, Wang, Pan, Nakano, Takayoshi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-10-2021
• Subjects: Electron backscattering diffraction (EBSD); Laser processing; Selective laser melting (SLM); Texture; Transition metal alloys and compounds; Electron backscattering diffraction (EBSD); Laser processing; Transition metal alloys and compounds; Texture; Selective laser melting (SLM)
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2021.114111

C40-NbSi2 with a hexagonal unit cell is focused as a high-temperature structural material. We first attempted the fabrication of the bulk C40-NbSi2 products via selective laser melting (SLM) in additive manufacturing (AM) process. Strong crystallographic texture control wherein was parallel to the building direction, i.e. development of the so-called basal fiber texture, was achieved in this study. The texture developed in products does not largely vary by changing the scanning strategy, unlike the textures of C11b-MoSi2 with a tetragonal unit cell and a β-Ti alloy with a cubic unit cell. A comparison of these results led us to the conclusion that crystal symmetry, i.e., the multiplicity of the preferential crystal growth direction, is one of the primary factors that governs the features of the textures developed in AM-built materials.
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