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Fundamental approach to superior trade-off between strength and ductility of TiB/Ti64 composites via additive manufacturing: From phase diagram to microstructural design
Journal of Materials Science & Technology ( IF 11.2 ) Pub Date : 2024-10-17 , DOI: 10.1016/j.jmst.2024.08.067
Chen-Wei Liu, Jianchao Li, Xiang Gao, Yongkun Mu, Zhouyang He, Huan Wang, Yandong Jia, Bo Yuan, Gang Wang, Hua-Xin Peng

Reinforcement distribution tailoring has been proven effective in strengthening and toughening titanium matrix composites (TMCs). In this work, the analysis of the Ti64 (Ti-6Al-4V)-B phase diagram indicated that B content dominates the TiB distribution. With this philosophy, B content regulation was applied to tailor homogeneous and network structures in Ti64-B composites fabricated via laser-directed energy deposition additive manufacturing (AM). The unique plate-like TiB attends inhomogeneous composites (Ti64–0.05B). However, in network composite (Ti64–0.25B), the TiB whisker (TiBw) arranges along prior β-Ti grains with the same orientation. Moreover, the synergistic improvement of strength (988 MPa → 1202 MPa), stiffness (106 GPa → 116 GPa), hardness (325 HV → 362 HV), and uniform elongation (5% → 7.8%) were achieved. This work exhibited a balanced strength/ductility trade-off, which provides a good guide on microstructure tailoring.

中文翻译:


通过增材制造在 TiB/Ti64 复合材料的强度和延展性之间实现卓越权衡的基本方法:从相图到微观结构设计



增强分布定制已被证明可有效增强和增韧钛基复合材料 (TMC)。在这项工作中,对 Ti64 (Ti-6Al-4V)-B 相图的分析表明,B 含量在 TiB 分布中占主导地位。根据这一理念,B 含量调节被应用于定制通过激光定向能量沉积增材制造 (AM) 制造的 Ti64-B 复合材料中的均质和网络结构。独特的板状 TiB 与不均匀复合材料 (Ti64–0.05B) 相得益彰。然而,在网络复合 (Ti64–0.25B) 中,TiB 晶须 (TiBw) 以相同的取向沿着先前的 β-Ti 晶粒排列。此外,强度 (988 MPa → 1202 MPa)、刚度 (106 GPa → 116 GPa)、硬度 (325 HV → 362 HV) 和均匀伸长率 (5% → 7.8%) 的协同提高。这项工作展示了强度/延展性的平衡权衡,这为微观结构定制提供了很好的指导。
更新日期:2024-10-17
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