Thermo-mechanical grain structure and texture tailoring of Mo-9Si-8B by electron beam powder bed fusion

Chen Y, Kammermeier E, Körner C, Wahlmann B (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Book Volume: 269

Article Number: 116698

DOI: 10.1016/j.matdes.2026.116698

Abstract

Refractory Mo-Si-B alloys offer superior mechanical strength and oxidation resistance at elevated temperatures, making them promising candidates for next-generation turbine engines. Electron beam powder bed fusion (PBF-EB) enables the direct fabrication of complex components from such high-temperature materials. While a 〈1 0 0〉 || BD fiber textures is commonly expected in PBF-processed cubic metals, the as-built Mo-9Si-8B developed a pronounced 〈1 1 1〉 || BD fiber or near-random textures, depending on the area energy. We elucidate the role of post-solidification plastic deformation in governing texture evolution and recrystallization in the Mo solid-solution phase. Electron backscatter diffraction (EBSD) and thermo-mechanical simulations were combined to relate the local plastic strain to recrystallization and texture evolution. The final 〈1 1 1〉 || BD texture arises from collective lattice reorientation of the initial weak 〈1 0 0〉 || BD solidification texture, driven by plastic deformation (pencil-glide) under a biaxial tensile stress state. The recrystallized fraction scales with the local magnitude of plastic strain, consistent with the thermo-mechanical simulation predictions, confirming plastic deformation as the unifying factor behind both texture evolution and recrystallization. This work establishes a quantitative area energy – plastic-strain – microstructure framework, providing a mechanistic basis for tailoring crystallographic texture and recrystallization, thereby supporting property-oriented process design in PBF-EB processed refractory alloys.

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How to cite

APA:

Chen, Y., Kammermeier, E., Körner, C., & Wahlmann, B. (2026). Thermo-mechanical grain structure and texture tailoring of Mo-9Si-8B by electron beam powder bed fusion. Materials & Design, 269. https://doi.org/10.1016/j.matdes.2026.116698

MLA:

Chen, Yong, et al. "Thermo-mechanical grain structure and texture tailoring of Mo-9Si-8B by electron beam powder bed fusion." Materials & Design 269 (2026).

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