Constructing the discrete gradient structure for enhancing interfacial bond strength of Ti6Al4V/NiTi heterostructured materials

doi:10.1016/j.jmst.2024.05.085

Abstract

Abstract: This study involved the fabrication of defect-free Ti6Al4V/NiTi functional gradient materials (FGMs) using laser-directed energy deposition (LDED). The resulting Ti6Al4V/NiTi FGM showed a varied microstructure with different grain shapes and irregular eutectic structures. As the NiTi content increased, the number and shape of precipitates in various deposited layers underwent significant alterations due to phase transitions. Notably, employing thermodynamic principles, we proposed a discrete FGM strategy by selectively excluding certain composition ranges, resulting in a tensile strength increase of more than 46.3 % compared to continuous FGMs. This study offers a promising approach for developing and optimizing additive manufacturing using heterogeneous structures.

Key words: Laser directional energy deposition, Functionally graded material, Heterogeneous microstructure, Mechanical properties

Xingran Li, Qiang Li, Minghao Nie, Pengfei Jiang, Shenghong Yan, Yue Jiang, Zhihui Zhang. Constructing the discrete gradient structure for enhancing interfacial bond strength of Ti6Al4V/NiTi heterostructured materials[J]. J. Mater. Sci. Technol., 2025, 214: 266-271.

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