Dynamic evolution of microstructure during laser shock loading and spall           failure of single crystal Al at the atomic scales

ABSTRACTThe dynamic evolution and interaction of defects under the conditions of shock loading in nanocrystalline Al with an average grain size of 20 nm is investigated using molecular dynamics simulations for an impact velocity of 1 km/s. Four stages of defect evolution are identified during shock deformation and failure that correspond to the initial shock compression (I), the propagation of the compression wave (II), the propagation and interaction of the reflected tensile waves (III), and the nucleation, growth, and coalescence of voids (IV). The results suggest that the spall strength of the nanocrystalline Al system is attributed to a high density of Shockley partials and a slightly lower density of twinning partials (twins) in the material experiencing the peak tensile pressures.

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Melting characteristics and dynamic evolution of microstructure of single-crystal gold film irradiated by laser under the non-Fourier effect

Molecular Crystals and Liquid Crystals ◽

10.1080/15421406.2021.1885970 ◽

2021 ◽

pp. 1-19

Author(s):

Qing Wang ◽

Ling Li ◽

Mo Yang

Keyword(s):

Single Crystal ◽

Gold Film ◽

Dynamic Evolution ◽

Melting Characteristics ◽

Evolution Of Microstructure

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Understanding the plasticity contributions during laser-shock loading and spall failure of Cu microstructures at the atomic scales

Computational Materials Science ◽

10.1016/j.commatsci.2021.110668 ◽

2021 ◽

Vol 198 ◽

pp. 110668

Author(s):

Marco J. Echeverria ◽

Sergey Galitskiy ◽

Avanish Mishra ◽

Remi Dingreville ◽

Avinash M. Dongare

Keyword(s):

Shock Loading ◽

Laser Shock ◽

Spall Failure

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Electron Microscopy of Shock Loaded Polycrystalline Beryllium

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052547 ◽

1974 ◽

Vol 32 ◽

pp. 506-507 ◽

Cited By ~ 1

Author(s):

J. M. Galbraith ◽

L. E. Murr ◽

A. L. Stevens

Keyword(s):

Electron Microscopy ◽

Wave Propagation ◽

Structural Change ◽

Single Crystal ◽

Diffraction Pattern ◽

Shock Loading ◽

Slip Systems ◽

Compression Tests ◽

X Ray Diffraction ◽

X Ray

Uniaxial compression tests and hydrostatic tests at pressures up to 27 kbars have been performed to determine operating slip systems in single crystal and polycrystal1ine beryllium. A recent study has been made of wave propagation in single crystal beryllium by shock loading to selectively activate various slip systems, and this has been followed by a study of wave propagation and spallation in textured, polycrystal1ine beryllium. An alteration in the X-ray diffraction pattern has been noted after shock loading, but this alteration has not yet been correlated with any structural change occurring during shock loading of polycrystal1ine beryllium.This study is being conducted in an effort to characterize the effects of shock loading on textured, polycrystal1ine beryllium. Samples were fabricated from a billet of Kawecki-Berylco hot pressed HP-10 beryllium.

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The dynamic evolution of microstructure and mechanical properties of an Al-Cu-Li alloy during multi-axial compression

Journal of Materials Research and Technology ◽

10.1016/j.jmrt.2021.07.106 ◽

2021 ◽

Author(s):

Yuan Lu ◽

Zhuoqing Xu ◽

Xiaochang Xu

Keyword(s):

Mechanical Properties ◽

Axial Compression ◽

Dynamic Evolution ◽

Microstructure And Mechanical Properties ◽

Evolution Of Microstructure

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Ultra-Speed Plastic Deformation of TC6 Sheet Induced by Laser Shock Loading

Advances in Machining & Manufacturing Technology VIII - Key Engineering Materials ◽

10.4028/0-87849-999-7.612 ◽

2006 ◽

pp. 612-616

Author(s):

Ji Chang Yang ◽

Jian Zhong Zhou ◽

Yong Kang Zhang ◽

Su Min Yin ◽

Ai Xin Feng ◽

...

Keyword(s):

Plastic Deformation ◽

Shock Loading ◽

Laser Shock

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Characterization of Plastic Deformation Induced by Microscale Laser Shock Peening

Journal of Applied Mechanics ◽

10.1115/1.1782914 ◽

2004 ◽

Vol 71 (5) ◽

pp. 713-723 ◽

Cited By ~ 52

Author(s):

Hongqiang Chen ◽

Jeffrey W. Kysar ◽

Y. Lawrence Yao

Keyword(s):

Plastic Deformation ◽

Single Crystal ◽

Crystal Lattice ◽

Electron Backscatter Diffraction ◽

Fem Analysis ◽

Copper Sample ◽

Laser Shock Peening ◽

Lattice Rotation ◽

Laser Shock ◽

Shock Peening

Electron backscatter diffraction (EBSD) is used to investigate crystal lattice rotation caused by plastic deformation during high-strain rate laser shock peening in single crystal aluminum and copper sample on 110¯ and (001) surfaces. New experimental methodologies are employed which enable measurement of the in-plane lattice rotation under approximate plane-strain conditions. Crystal lattice rotation on and below the microscale laser shock peened sample surface was measured and compared with the simulation result obtained from FEM analysis, which account for single crystal plasticity. The lattice rotation measurements directly complement measurements of residual strain/stress with X-ray micro-diffraction using synchrotron light source and it also gives an indication of the extent of the plastic deformation induced by the microscale laser shock peening.

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