Статья

TiN-driven superior strength-ductility synergy in a laser-fabricated NiCoV medium-entropy alloy

Weijin CaiState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaQiang LongState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaYongjie ZhangInstitute for Materials Research, Tohoku University, Sendai, 980-8577, JapanKefu GanSchool of Materials Science and Engineering, Central South University, Changsha, 410083, ChinaYu. N. MansurovTashkent State Transport University, Tashkent, 100167, UzbekistanFeng WangState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaJi GuState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaBin LiuState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaYong LiuState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaMin SongState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, ChinaZhangwei WangState Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China

Transactions of Materials Researchjournal2025en

ABI

Аннотация

We report the fabrication of a TiN nanoparticle-reinforced NiCoV medium-entropy alloy using laser powder bed fusion (LPBF), achieving an exceptional combination of properties. The incorporation of TiN nanoparticles fundamentally improves the LPBF process, reducing porosity and enhancing stability by increasing laser energy absorption and suppressing molten pool instabilities. Furthermore, these nanoparticles optimized the cellular substructures by promoting heterogeneous nucleation, and induced dislocation accumulation via thermophysical nature difference. The resulting composite exhibits an exceptional strength-ductility synergy, with a yield strength of 1.0 GPa, an ultimate tensile strength of 1.3 GPa, and an elongation of 35 %. This superior mechanical performance is attributed to the multiscale coordination mechanisms. These include Orowan strengthening amplified by the nanoparticles, enhanced dislocation strengthening resulting from the optimized cellular substructures, and elemental interdiffusion driven by laser-induced nanoparticle dissolution. Such interdiffusion promotes stacking faults and planar slip, which facilitate a homogeneous strain distribution. This work elucidates a novel strategy for developing advanced metal matrix composites by leveraging ceramic nanoparticles to optimize both the manufacturing process and the resultant multi-scale microstructure.

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Темы

High Entropy Alloys Studies Additive Manufacturing Materials and Processes Laser Material Processing Techniques

Идентификаторы

DOI: 10.1016/j.tramat.2025.100155

Цитирования и источники

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Показатели — AkademScholar