# Effect of nanoscale cellular structure on the mechanical properties of Inconel 718 with unique hierarchical structure fabricated by laser powder bed fusion https://mdr.nims.go.jp/datasets/ee01ae03-ca56-4f60-b700-527bc1fe897a ## File - [Acta Materialia 303 (2026) 121696.pdf](https://mdr.nims.go.jp/filesets/04601d09-a079-4eaf-af27-acb71c54dc8c/download) ([Detail](https://mdr.nims.go.jp/filesets/04601d09-a079-4eaf-af27-acb71c54dc8c.md)) ## Id ee01ae03-ca56-4f60-b700-527bc1fe897a ## Local identifier ## Visibility open_to_public ## State published ## Created at 2025-12-28T05:41:44.894885Z ## Updated at 2026-01-05T05:55:20.128954Z ## Published at 2026-01-05T23:19:18.420938Z ## Doi ## First published url https://doi.org/10.1016/j.actamat.2025.121696 ## Date published 2025-11-02 ## Recorded date published 2026-1 ## Resource type journal_article ## Manuscript type vor ## Collection ## Title - title: Effect of nanoscale cellular structure on the mechanical properties of Inconel 718 with unique hierarchical structure fabricated by laser powder bed fusion title_type: original lang: en ## Description - description: The deformation behavior and strengthening mechanism of Inconel 718 with a hierarchical structure composed of microscale crystallographic lamellar microstructure (CLM) and nanoscale cellular structure, fabricated by laser powder bed fusion, were clarified via nanoscale microstructural and in-situ neutron diffraction analyses. The CLM is a layered structure parallel to the building direction (BD) and consists of relatively wide main and narrow sub-layers with 〈110〉 and 〈100〉 orientations, respectively, with respect to BD. This is the first study to demonstrate that the yield stress of the alloys depends strongly on deformation stresses of the sub-layers, even though Schmid factors of the primary slip system for both layers are the same. The sub-layer continues to deform elastically even beyond the micro-yield point of the main layer, which results in the macroscopic strengthening at an early stage of deformation. On the other hand, the cellular structure is formed in both layers, associated with a dendritic cell growth along 〈100〉 direction, Nb segregation between the cells and an accumulation of dislocations to decrease a residual stress. The cell boundaries with numerous dislocations and Nb segregation act as a strong barrier to dislocation motion resulting in a stress increase through the Hall-Petch law, even though they are low-angle grain boundaries. The spacing and morphology of the cell boundary depend strongly on fabrication conditions. The optimized cellular structure provides significant strengthening comparable to or greater than that caused by large-angle grain boundaries, thereby increasing the macroscopic strength of the alloys through hardening of the sub-layer. description_type: abstract lang: und ## Creator - name: Ken Cho role: author - name: Kippei Yamashita role: author - name: Shinnosuke Kakutani role: author - name: Takuma Saito role: author orcid: https://orcid.org/0000-0001-9537-5072 organization: National Institute for Materials Science - name: Taisuke Sasaki role: author orcid: https://orcid.org/0000-0002-5952-7638 organization: National Institute for Materials Science - name: Katsuhiko Sawaizumi role: author - name: Masayuki Okugawa role: author - name: Yuichiro Koizumi role: author - name: Tsuyoshi Mayama role: author - name: Taichi Kikukawa role: author - name: Ozkan Gokcekaya role: author - name: Takuya Ishimoto role: author - name: Hajime Kimizuka role: author - name: Wu Gong role: author - name: Takuro Kawasaki role: author - name: Stefanus Harjo role: author - name: Takayoshi Nakano role: author - name: Hiroyuki Y. Yasuda role: author ## Contact agent ## Publisher organization: Elsevier BV ## Managing organization ## Keyword - subject: Additive manufacturing schema: not_defined - subject: Nickel superalloys schema: not_defined - subject: Crystallographic texture schema: not_defined - subject: Cellular structure schema: not_defined - subject: Strengthening mechanism schema: not_defined - subject: Neutron diffraction schema: not_defined ## Rights - description: Published by Elsevier Inc. on behalf of Acta Materialia Inc. This is an open access article under the CC BY-NC-ND license ( http://creativecommons.org/licenses/by-nc-nd/4.0/ ). identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/ date_licensed: 2025-11-03 ## Other identifier(s) ## Data origin - data_origin_type: other ## Embargo ## Journal - title: Acta Materialia issn: '13596454' volume: '303' start_page: 121696 end_page: 121696 article_number: '121696' ## Conference ## Related item ## Funding - identifier: 21H05196 funder_name: Japan Society for the Promotion of Science description: Grant-in-Aid for Transformative Research Area (A) - identifier: 2022B0149 funder_name: Japan Proton Accelerator Research Complex - identifier: JPMJCR2194 funder_name: Japan Science and Technology Agency description: 'CREST-Nanomechanics: Elucidation of macroscale mechanical properties based on understanding nanoscale dynamics of innovative mechanical materials' ## Instrument ## Instrument operator ## Instrument managing organization ## Measurement method ## Specimen ## Chemical composition ## Structure for specimen ## Structural feature for specimen ## Specific property for specimen ## Process for specimen treatment ## Computational method ## Energy level/transition state ## Software ## Custom property ## Fileset - id: 04601d09-a079-4eaf-af27-acb71c54dc8c filename: Acta Materialia 303 (2026) 121696.pdf content_type: application/pdf size: 17282067 md5: c61c47e43f0b5c106ba0d84163747efa ## Thumbnail fileset_id: 04601d09-a079-4eaf-af27-acb71c54dc8c filename: Acta Materialia 303 (2026) 121696.pdf