首页|Direct observation of shock-induced phase transformation in polycrystalline iron via in situ x-ray diffraction

Direct observation of shock-induced phase transformation in polycrystalline iron via in situ x-ray diffraction

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Phase transition of polycrystalline iron compressed along the Hugoniot is studied by combining laser-driven shock with in situ x-ray diffraction technique.It is suggested that polycrystalline iron changes from an initial body-centered cubic structure to a hexagonal close-packed structure with increasing pressure(i.e.,a phase transition from α to ε).The relationship between density and pressure for polycrystalline iron obtained from the present experiments is found to be in good agreement with the gas-gun Hugoniot data.Our results show that experiments with samples at lower temperatures under static loading,such as in a diamond anvil cell,lead to higher densities measured than those found under dynamic loading.This means that extrapolating results of static experiments may not predict the dynamic responses of materials accurately.In addition,neither the face-centered cubic structure seen in previous molecular-dynamics simulations or two-phase coexistence are found within our experimental pressure range.

in situ x-ray diffractionphase transitionpolycrystalline iron

张帆、董佳钦、谢志勇、贺芝宇、舒桦、王瑞荣、熊俊、贾果、方智恒、王伟、肖大武、雷安乐、陈洁、黄秀光

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Collaborative Innovation Center of IFSA(CICIFSA),School of Physics and Astronomy,Center for Ultrafast Science and Technology,Key Laboratory for Laser Plasmas(Ministry of Education),Shanghai Jiao Tong University,Shanghai 200240,China

Shanghai Institute of Laser Plasma,China Academy of Engineering Physics,Shanghai 201800,China

Institute of Materials,China Academy of Engineering Physics,Mianyang 621700,China

SG-Ⅱ laser operation group for their laborious work and close collaboration.This work was supported by the National Natural SG-Ⅱ laser operation group for their laborious work and close collaboration.This work was supported by the National Natural SG-Ⅱ laser operation group for their laborious work and close collaboration.This work was supported by the National Natural

123040331207232811991073

2024

10.1088/1674-1056/ad625a

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(10)