Study of shock-wave induced fracture process using time-resolved Laue diffraction

2019 Fiscal Year Final Research Report

• Project/Area Number: 17H04820
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Quantum beam science
• Research Institution: High Energy Accelerator Research Organization (2017, 2019); Jichi Medical University (2018)
• Principal Investigator: Ichiyanagi Kouhei 大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 研究員 (70435618)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: 衝撃破壊

Outline of Final Research Achievements

We developed snap-shot and pump-probe time-resolved X-ray diffraction system using a High power Nd:Glass laser and a hard X-ray pulse required from the Photon Factory Advanced Ring. The wavelength, pulse width, and energy of the high power laser, which dirven shock wave are 1064 nm, 12 ns, and 15 J/pulse, respectively. We succeeded in constructing the synchronization system of the high power laser and the hard X-ray, which has the 100 ps pulse width. By using this equipment system, we measure the refinement of metal particle and phase transition of ceramics materials under laser-induced laser shock wave loading. The grain of aluminum metal was reduced from micro- to nano-size within a few nanosecond. In addition, the in-situ dislocation density can be determined from X-ray diffraction data under shock wave loading.

Free Research Field

衝撃超高圧

Academic Significance and Societal Importance of the Research Achievements

材料の衝撃破壊過程は不可逆かつ瞬間的な動的現象であり、衝撃破壊時における物質の変形過程をその場測定するのは難しい。本研究では、放射光の硬X線パルスと衝撃波を発生させる高強度レーザーを組み合わせた時間分解X線回折法により衝撃波が伝搬する際中の材料変形機構の観測を可能にした。衝撃波による材料変化をその場測定することで、耐衝撃性の材料評価や材料設計開発の研究指針となる。