Synergic enhancement of strength and ductility in wire arc additively manufactured Ti-Cu alloys

被引：1
作者：
Zheng, Zhendan [1 ]
Chen, Jiaming [1 ]
Yu, Peng [1 ]
Wu, Shaojie [1 ,2 ]
Cheng, Fangjie [1 ,2 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300350, Peoples R China
[2] Tianjin Key Lab Adv Joining Technol, Tianjin 300350, Peoples R China
来源：
MATERIALS LETTERS | 2024年 / 377卷
关键词：
Eutectoid structure; Heterogeneous deformation; Geometrically necessary dislocations; Nanoindentation; Strength and ductility;
D O I：
10.1016/j.matlet.2024.137449
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The insignificant heterogeneous deformation behavior between eutectoid structure (ES, lamellar Ti2Cu + alpha') and oversaturated alpha' in additively manufactured Ti-Cu alloys leads to severe strength-ductility trade-off. In the current work, the Cu-solute diffusion in oversaturated alpha' was cleverly promoted by employing the large-heat-input gas metal arc-based wire arc additive manufacturing (GMA-WAAM). A balanced phase ratio of 1:1 and a prominent hardness difference of 3.4 GPa between ES and alpha' was achieved. Therefore, a significant heterogeneous deformation behavior was triggered, as indicated by the generated geometrically necessary dislocations (GNDs) of 3.45 x 10(15) m(-2) during the tensile process. The component exhibited a yield strength of 971 MPa and an elongation to fracture of 11.6 %, demonstrating a synergic enhancement of strength and ductility.
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