From August 25 to 28, Prof. Tomoyuki Homma and Mr. Ryoya Hanaoka from Nagaoka University of Technology (NUT) will be staying with our group through the NIMS Collaborative Research Center Program. During their stay, we will discuss our collaborative research and work on atom probe data analysis.
"Nanoscale oxide-mediated grain-boundary stabilization enables simultaneous strength and ductility in an additively manufactured high-entropy alloy"
P.-H Chou, H.-R. Xie, T.-W. Chen, T.N. Palleda, M. Saha, T.T. Sasaki, K. Kakehi, H. Murakami, A.-C. Yeh, Materials Science and Engineering A, 975 (2026) 150952.
This work is the result of a collaboration with Prof. An-Chou Yeh’s group at National Tsing Hua University. Saha and Sasaki worked with Po-Heng and Tso-Wei, who stayed at NIMS through the International Cooperative Graduate Program (ICGP), to characterize the microstructure of a high-entropy superalloy fabricated by metal additive manufacturing using 3DAP and TEM.
Taisuke Sasaki participated in The 12th Pacific Rim International Conference on Advanced Materials and Processing (PRICM12), held in Gold Coast, Australia, from August 10 to 14 and delivered an invited talk entitled:
"Developing strong and formable magnesium alloys utilizing deformation-induced G.P. zone precipitation"
"Mapping Trace Hydrogen by 3D Atom Probe: Optimizing Experimental Workflows"
Mainak Saha, Zehao Li, Yasuo Shimizu, Yuji Tanaka, Takaaki Tanaka, Kazuki Endoh, Yuhei Ogawa, Osamu Takakuwa, Rintaro Ueji, Akinobu Shibata, Tadakatsu Ohkubo, Taisuke T. Sasaki, Materials Transactions, In Press.
Based on our group’s previous studies on hydrogen visualization using 3DAP, we systematically investigated and established a workflow for hydrogen mapping using atom probe tomography, which Saha has compiled into a paper.
"Multi-axis atom-probe tomography of α' precipitation in Fe–Cr–Al alloys: Thermal aging, ion irradiation, and pre-aging effects"
Y. Abe, T.T. Sasaki, S. Yamashita, N. Ohkubo, S. Ukai, Journal of Nuclear Materials, 632 (2026) 156940.
This study systematically investigated the effects of ion irradiation and Al concentration on the precipitation of the α' phase, which is responsible for the hardening and embrittlement of Fe–Cr–Al accident-tolerant fuel (ATF) cladding.
Mr. Kittipon Amornprasertkij, who had been in our group since June 12, has returned to Thailand.
We sincerely thank him for his contributions during his stay and wish him every success in his future endeavors!
"A unified predictive framework for α' precipitation in Fe–Cr–Al alloys based on effective diffusion length: From dense-cascade irradiation to thermal aging"
Yosuke Abe, Taisuke T. Sasaki, Shinichiro Yamashita, Nariaki Ohkubo, Shigeharu Ukai, Acta Materialia, 317 (2026) 122580..
This study employs machine learning to quantitatively predict the precipitation behavior of the α' phase in Fe–Cr–Al alloys using a dataset of precipitate characteristics quantified by atom probe tomography (APT). The research was conducted in collaboration with the Japan Atomic Energy Agency (JAEA).
"Strain-Induced Martensitic Transformation During Uniaxial Tension and Low Cycle Fatigue in a 0.4% C Direct Quenched and Partitioned Martensitic Steel"
Dipak Dhanke, Tanmayee Bhadange, Sushil K. Mishra, Mainak Saha, T. Sasaki, Sumit Ghosh, Mahesh C. Somani, Amol A. Gokhale, Advanced Engineering Materials, In Press..
One of the outcomes of our collaborative research with Dr. Gokhale from IIT Bombay, who visited our group last year. Thank you for working with us, Amol!
Taisuke Sasaki participated in the World Hydrogen Energy Conference 2026 (WHEC2026), held in Singapore from June 22 to 26 and delivered an invited talk entitled:
"Hydrogen Visualization by Atom Probe Tomography for Hydrogen Embrittlement Studies"
Kittipon (Bonus), a third-year undergraduate student at Chulalongkorn University in Thailand, will be working in the group for about two months through the NIMS Internship Program. Welcome, Bonus!
"Evaluation of spin mixing conductance in Co2FeGa0.5Ge0.5/Pt bilayer and the effect of ultrathin Cu, Ni, Ru, Ta, or Cr insertion layers"
Madhav M. Bhat, H. Suto, T.T. Sasaki, A. Perumal, A. Srinivasan, Y. Sakuraba, Physical Review Materials, 10 (2026) 0554414.
"Correlated microstructure and coercivity in 3T high-coercivity Nd–Fe–B sintered magnets with a low Tb content"
Z. Wang, T.T. Sasaki, Y. Une, T. Ohkubo, Acta Materialia, 314 (2026) 122272.
We achieved high coercivity in fine-grained initially HRE-free Nd–Fe–B sintered magnets through a two-step GBD process of Tb–Cu and Pr–Cu eutectic alloys, and clarified its microstructual origin using three-dimensional FIB-SEM analysis and nanoscale structural characterization by STEM.
"Analysis of the mechanism of negative anomalous Nernst effect in Nodal line topological MnAlGe thin films"
N. Gupta, R. Toyama, F. Makino, B. Bairagya, K. Masuda, W. Zhou, T.T. Sasaki, Y. Sakuraba, Physical Review B, 113 (2026) 184404.
We will continue to enrich our group website and proactively disseminate information.