Phonon viscous resistance dependence of dislocation formation and growth under shock wave induced plastic fracture

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01677
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26050:Material processing and microstructure control-related
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Ichiyanagi Kouhei 公益財団法人高輝度光科学研究センター, 回折・散乱推進室, 研究員 (70435618)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 衝撃高圧

Outline of Final Research Achievements

The mechanism of material fracture by shock waves is extremely difficult to quantify, including in-situ measurements, because it is a fast and discontinuous phenomenon occurring inside shock waves propagating at the speed of sound. In this study, time-resolved X-ray diffraction measurements were used to observe the plastic fracture mechanism of single crystals under shock compression, and time-resolved Laue diffraction measurements and angle-dispersive time-resolved X-ray diffraction measurements were constructed to simultaneously measure the shock wave propagation direction and the crystal lattice plane perpendicular to the shock wave propagation direction for Si[001] single crystals. Direct observation of the lattice response during plastic fracture of Si[001] single crystals was successfully achieved by applying shock compression at high strains above the elastic limit.

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Free Research Field

衝撃圧縮、時間分解X線回折

Academic Significance and Societal Importance of the Research Achievements

本研究は、社会生活における安全な生活を送るための材料評価法およびその衝撃破壊の物理的なメカニズムの解明を目的として行った。特に、衝撃波による破壊現象は、身近にあるなかで発生した場合、人体および社会生活に大きな影響を及ぼす現象である。放射光のX線パルスにより、その場観察から高速破壊現象を定量化することで安心・安全な社会生活の構築を目指す研究である。