Dynamic behavior of zirconium alloy E110 under submicrosecond shock-wave loading

Kazakov, Dmitry; Kozelkov, O.E.; Mayorova, A.S.; Malyugina, S. N.; Mokrushin, S. S.; Pavlenko, A. V.

doi:10.1051/epjconf/20159402021

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…The stress values of 3.8GPa and 7.6GPa therefore give lower and upper bounds for the α → ω transition stress, in good agreement with previous measurements in pure zirconium 23 that found a threshold stress of 6.8GPa for the α → ω transition, with partial transformations seen above 5GPa. A higher threshold stress of 10.6GPa has been estimated in the zirconium alloy E110 24 , consistent with known alloying effects on the α → ω transition in titanium 10 .…”

Section: Shocked Matter Simulationssupporting

confidence: 79%

Picosecond dynamics of a shock-driven displacive phase transformation in Zr

et al. 2016

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High pressure solid state transformations at high strain rates are usually observed after the fact, either during static holding or after unloading, or inferred from interferometry measurements of the sample surface. The emergence of femtosecond X-ray diffraction techniques provides insight into the dynamics of short-timescale events such as shocks. We report laser pump-probe experiments of the response of Zr to laser driven shocks over the first few nanoseconds of the shock event, enabling the α → ω transition and orientation relationship to be observed in real time with picosecond resolution. A clear orientation relationship of (1010)α|| (1011)ω is found, in conflict with ω → α annealing experiments in zirconium and the two α → ω pathways proposed for titanium.The dynamics of materials subject to ultrafast shocks are of fundamental interest. At high strain rates deformation may be effected by the movement of interfaces during twinning and displacive phase transformations, in addition to conventional dislocation-mediated plasticity 1 . The α → ω phase transformation in hexagonal close packed metals is of particular importance because the high-pressure ω-phase is brittle, which may give rise to failure in metals that would be otherwise suited to a range of applications 2 .In this paper we report the first direct experimental observation of the α → ω phase transition in a hexagonal close packed metal, α-Zr, under shock conditions, employing recently developed 3-6 laser pump-probe experiments using the X-ray free electron laser (XFEL) to perform femtosecond X-ray diffraction (XRD) at the linac coherent light source of the Stanford linear accelerator center (CXI station, LCLS, SLAC). Pump-probe experiments use a femtosecond XFEL pulse to take an XRD snapshot (the probe) at a precise time delay after a shock pulse from an optical laser (the pump). By repeating this operation on statistically equivalent samples a time-ordered data set is produced, yielding a dynamic representation of the shock response.

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Section: Shocked Matter Simulationssupporting

confidence: 79%

Picosecond dynamics of a shock-driven displacive phase transformation in Zr

et al. 2016

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“…Полученные зависимости σ 1 true от ε 1 true дополняют данные, полученные для Zr-1 % Nb при более низких скоростях деформации [1,14], a при скорости 10 3 с −1 данные [15]. Обнаружено, что с ростом скорости деформации не только увеличивается напряжение течения, но и снижаются предельные деформации до разрушения.…”

Section: результаты и обсуждениеunclassified

Mechanical behavior of the Zr-1%Nb alloy at high strain rates and stress triaxiality from 0.33 to 0.5

Skripnyak

Chirkov

2020

Lett. Mater.

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It is important to know the patterns of a damage nucleation and fracture of the Zr-1% Nb zirconium alloy at high strain rates and in the presence of stress concentrators for the design of new critical structures of nuclear reactors, fuel claddings and pressure pipes. In this research the influence of the strain rate in the range from 0.1 to 10 3 s −1 on the plastic deformation resistance and the fracture character of the Zr-1% Nb alloy under tension at room temperature and the stress triaxiality parameter 0.33 < η < 0.5 was studied. The tests were carried out using an Instron VHS 40/50-20 servo-hydraulic testing machine on flat specimens with a smooth and notched gage parts. Video recording of the process of sample tension was carried out by the Phantom V711 camera at speed of recording of 100 000 frames per second. Strain fields in gage zone of specimens at 10 2 and 10 3 s −1 obtained by the Digital Images Correlation method. It was shown that the dynamic fracture of the Zr-1% Nb alloy is the result of nucleation and growth of damage in localized shear bands. Using numerical modeling, the evolution of damage and fracture of samples under high-speed tension is analyzed. It is shown that strain localization bands begin to develop in the incision zone at lower macroscopic strains. The location of the plastic strain localization bands and their intersection in the separation zone determines the orientation of the cracks near the stress concentrator zone.

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Dynamic behavior of zirconium alloy E110 under submicrosecond shock-wave loading

Cited by 2 publications

References 15 publications

Picosecond dynamics of a shock-driven displacive phase transformation in Zr

Picosecond dynamics of a shock-driven displacive phase transformation in Zr

Mechanical behavior of the Zr-1%Nb alloy at high strain rates and stress triaxiality from 0.33 to 0.5

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