A novel high-strength and high-toughness dual-phase titanium alloy fabricated by CMT-DED

A novel high-strength and high-toughness dual-phase titanium alloy fabricated by CMT-DED

This study introduces Ti6Al4V2Fe, a novel dual-phase titanium alloy, manufactured via Cold Metal Transfer Directed Energy Deposition (CMT-DED) for aerospace applications. This alloy meets stringent performance demands and enables efficient additive manufacturing of large-scale components. We investi...

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Bibliographic Details
Main Authors: Zhenwen Chen, He Li, Zhen Wang, Cheng Xu, Xiaoyong Zhang, Jingjing Cheng, Jikang Fan, Jian Kong, Kehong Wang, Yong Peng
Format: Article
Language:English
Published: Taylor & Francis Group 2025-12-01
Series:Virtual and Physical Prototyping
Subjects:
Additive manufacturing
titanium alloy
cold metal transfer-directed energy deposition (CMT-DED)
dynamic mechanical properties
microstructural evolution
adiabatic shear bands introduction
Online Access:https://www.tandfonline.com/doi/10.1080/17452759.2025.2476009
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Summary:This study introduces Ti6Al4V2Fe, a novel dual-phase titanium alloy, manufactured via Cold Metal Transfer Directed Energy Deposition (CMT-DED) for aerospace applications. This alloy meets stringent performance demands and enables efficient additive manufacturing of large-scale components. We investigated its microstructural evolution and mechanical properties under static and dynamic conditions. Room temperature tensile tests and dynamic impact assessments (1500/s to 3000/s) revealed a refined microstructure with short columnar and fine equiaxed prior-β grains, influenced by undercooling and thermal gradients. The addition of Fe enhanced β phase nucleation, resulting in a basket-weave α + β structure. Dynamic tests highlighted increasing strength with strain rate, with horizontal samples displaying superior strength. A constitutive model confirmed the experimental stress-strain profiles. At 2500/s, adiabatic shear bands indicated heightened sensitivity in horizontal samples, while vertical samples absorbed more energy, linked to dynamic recrystallization. The Ti6Al4V2Fe alloy, fabricated by CMT-DED, demonstrates remarkable strength, enhanced toughness, and reduced anisotropy, marking it as a prime candidate for aerospace applications.
ISSN:1745-2759
1745-2767

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