Development of data assimilation method for crystal plasticity analysis reflecting dislocation microstructures

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14466
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26010:Metallic material properties-related
• Research Institution: Kyushu University
• Principal Investigator: Ihara Shiro 九州大学, 先導物質化学研究所, 助教 (60909745)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: 走査透過電子顕微鏡法 / その場観察 / ３次元観察

Outline of Final Research Achievements

In this study, we developed a nanoscale 3D in-situ observation method and obtained important knowledge about the fracture process through in-situ tensile observation of metals.In the former, we succeeded in a world first in capturing nanoparticle sintering in three dimensions through in-situ heating observation.In the latter case, we devised a unique sample preparation method and analyzed the crack propagation process, revealing that amorphization occurs at the crack tip.By analyzing the crack propagation process, it was clarified that amorphization occurs at the crack tip. By gaining knowledge about observation methods and fracture behavior at the nanoscale in this way, it is expected that this knowledge will be applied to advanced analytical techniques in combination with computational science.

Free Research Field

金属材料

Academic Significance and Societal Importance of the Research Achievements

ナノスケールにおける３次元その場観察は例が極めて少なく，ナノ粒子の焼結現象を捉えた例は世界初となる．これによって，ナノ材料の動的挙動を詳細に解析できるものと期待される．また，本研究で得られたナノスケールにおける破壊現象の直視観察結果は破壊モデルの構築にあたって重要な知見になると考えられ，上記３次元その場観察と組み合わせることで更なる展開が期待できる．