Deformations of Ti-6Al-4V additive-manufacturing-induced isotropic and anisotropic columnar structures: Insitu measurements and underlying mechanisms

The deformations of isotropic and anisotropic Ti-6Al-4V columnar structures fabricated by additive manufacturing were extensively examined. The distinct texture and microstructure distributions were characterised. In situ X-ray diffraction measurements show different lattice activities resulting fro...

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Bibliographic Details
Published in:Additive manufacturing 2020-10, Vol.35 (C), p.101322-101322, Article 101322
Main Authors: Tseng, Jo-Chi, Huang, Wei-Chin, Chang, Wei, Jeromin, Arno, Keller, Thomas F., Shen, Jun, Chuang, Andrew Chihpin, Wang, Chun-Chieh, Lin, Bi-Hsuan, Amalia, Lia, Tsou, Nien-Ti, Shih, Shao-Ju, Huang, E-Wen
Format: Article
Language:English
Subjects:
Additive manufacturing
ENGINEERING
Heterogeneous texture distribution
high-energy x-ray diffraction
In situ X-ray diffraction
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Microstructure
Research Paper
Ti-6Al-4V
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Summary:The deformations of isotropic and anisotropic Ti-6Al-4V columnar structures fabricated by additive manufacturing were extensively examined. The distinct texture and microstructure distributions were characterised. In situ X-ray diffraction measurements show different lattice activities resulting from the different microstructure distributions. Spatially resolved mapping revealed manufacturing-induced crystallite-orientation distributions that determine the deformation mechanisms. We propose a self-consistent model to correlate the multi-scale characteristics, from the anisotropic-texture-distribution microstructure to the bulk mechanical properties. We determined that basal and pyramidal slip activities were activated by tension deformation. The underlying additive-manufacturing-induced crystal plasticity plays a major role. We find that the texture development of the columnar structures and the distribution of crystallite orientation achieved by different processing conditions during additive manufacturing have important effects on the mechanical properties. The dominant deformation mode for the anisotropic Ti-6Al-4V columnar structure is basal slip, and that for the isotropic Ti-6Al-4V columnar structure is pyramidal slip. The difference may be important for determining the fatigue behaviour.
ISSN:2214-8604
2214-7810
DOI:10.1016/j.addma.2020.101322