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Mechanical property of the shape memorable Ti-Zr-Nb-Sn alloy manufactured by in-situ alloying in directed energy depositionopen access

Authors
Lee, YukyeongLi, ShuangleiOh, Jeong SeokNam, Tae-HyunLee, Jun-SeobKim, Jung Gi
Issue Date
Jan-2024
Publisher
ELSEVIER
Keywords
Additive manufacturing; Titanium; Shape memory alloy; Mechanical property; Corrosion
Citation
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v.28, pp 11 - 21
Pages
11
Journal Title
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume
28
Start Page
11
End Page
21
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/69327
DOI
10.1016/j.jmrt.2023.11.261
ISSN
2238-7854
2214-0697
Abstract
Ni-free fl-type Ti alloys have been developed to manufacture high-strength, low-elastic-modulus, shapememorable medical, and non-toxic components. Because the machinability of these alloys is generally poor, processing via additive manufacturing is an important step in the development of order-made medical devices. Although many studies evaluated the mechanical properties of additively manufactured Ni-free fl-type Ti alloys, investigation of their heterogeneous microstructure resulting from the rapid melting-solidification cycling has not been discussed yet. In this study, the role of a heterogeneous microstructure on the performance of an in-situ alloyed Ti-Zr-Nb-Sn alloy was investigated. The metastable and nanosized omega phase, which is initiated in the nonequilibrium environment, enhances the yield strength without severe ductility degradation. Additionally, deformation-induced martensitic transformation occurs near the unmelted particle/matrix interface, and this phase transformation not only contributes to transformation-induced plasticity but also provides a superelasticity to the present alloy. Although the remained partially melted particle induces a localized corrosion in the matrix, the present results show that the heterogeneous microstructure of the in-situ alloyed Ti-Zr-Nb-Sn alloy exhibits outstanding mechanical properties and superelasticity, which will be suitable to fabricate biomedical parts via additive manufacturing.
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Nam, Tae Hyeon
대학원 (나노신소재융합공학과)
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