Grain refinement of LY2 aluminum alloy induced by ultra-high plastic strain during multiple laser shock processing impacts

Lu, Jinzhong; Luo, Kaiyu; Zhang, Y.K.; Cui, C.Y.; Sun, Gui Fang; Zhou, Jing; Zhang, L.; You, Jingbi; Chen, K.M.; Zhong, J.W.

doi:10.1016/j.actamat.2010.03.026

Cited by 363 publications

(120 citation statements)

References 28 publications

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“…Moreover, it was found that after three LSP impacts, the value of saturated compressive residual stress is independent of surface roughness. In another study, Lu et al [23] reported obvious micro-structure refinement of LY2 Al alloy due to the ultra-high plastic strain induced by multiple LSP impacts, whereas the minimum grain size in the top surface after multiple LSP impacts was about 100-200 nm.…”

Section: Introductionmentioning

confidence: 99%

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

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The influence of nanosecond laser pulses applied by laser shock peening without absorbent coating (LSPwC) with a Q-switched Nd:YAG laser operating at a wavelength of \ = 1064 nm on 6082-T651 Al alloy has been investigated. The first portion of the present study assesses laser shock peening effect at two pulse densities on three-dimensional (3D) surface topography characteristics. In the second part of the study, the peening effect on surface texture orientation and micro-structure modification, i.e. the effect of surface craters due to plasma and shock waves, were investigated in both longitudinal (L) and transverse (T) directions of the laser-beam movement. In the final portion of the study, the changes of mechanical properties were evaluated with a residual stress profile and Vickers micro-hardness through depth variation in the near surface layer, whereas factorial design with a response surface methodology (RSM) was applied. The surface topographic and micro-structural effect of laser shock peening were characterised with optical microscopy, InfiniteFocus® microscopy and scanning electron microscopy (SEM). Residual stress evaluation based on a hole-drilling integral method confirmed higher compression at the near surface layer (33 um) in the transverse direction (Omin) of laser-beam movement, i.e. -407 ±81 MPa and -346 ± 124 MPa, after 900 and 2500 pulses/cm 2 , respectively. Moreover, RSM analysis of micro-hardness through depth distribution confirmed an increase at both pulse densities, whereas LSPwC-generated shock waves showed the impact effect of up to 800 um below the surface. Furthermore, ANOVA results confirmed the insignificant influence of LSPwC treatment direction on micro-hardness distribution indicating essentially homogeneous conditions, in both I and T directions.

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Section: Introductionmentioning

confidence: 99%

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Trdan

Porro

Ocaña

et al. 2012

Surface and Coatings Technology

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“…Many researchers attributed the improvement of mechanical properties to the compressive residual stresses brought by LSP [10,11]. In addition, there were also many investigations that focused on the effect of microstructure modification induced by LSP on the improvement of material performances [6,12]. However, there is little information available in the literature about the relevance of material performances and the changes of surface integrity affected by LSP.…”

Section: Introductionmentioning

confidence: 94%

“…With the action of plastic deformation, a certain degree of compressive residual stresses is introduced into the surface layer of materials [8], the microstructure of materials can be modified [6], and the surface integrity of workpiece changes [9] concurrently. The performances of materials subjected to surface strengthening are the concentrated reflection of the above-mentioned changes caused by plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

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Surface topography evolution of Ni-based single crystal superalloy under laser shock: Formation of the nano-scale surface reliefs

Liu

Qiao

et al. 2017

Appl. Phys. A

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“…[1][2][3][4][5][6] Through the interaction of a pulsed high-intensity laser beam and an energy absorption layer on the metallic target surface, a shock wave with a high amplitude can be generated and propagates into the target. 2,[7][8][9][10][11][12][13] If the amplitude of the shock wave exceeds the Hugoniot elastic limit (HEL) of the target material, plastic deformation occurs and residual compressive stresses are induced near the surface, which results in the enhancement of fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Shock pressure induced by glass-confined laser shock peening: Experiments, modeling and simulation

Zhang

Song

et al. 2011

Journal of Applied Physics

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Infrared thermometry and interferential microscopy for analysis of crater formation at the surface of fused silica under CO2 laser irradiation J. Appl. Phys. 111, 063106 (2012) The interaction of 193-nm excimer laser irradiation with single-crystal zinc oxide: Positive ion emission J. Appl. Phys. 111, 063101 (2012) Laser produced streams of Ge ions accelerated and optimized in the electric fields for implantation into SiO2 substrates Rev. Sci. Instrum. 83, 02B305 (2012) Formation of metallic colloids in CaF2 by intense ultraviolet light Appl. Phys. Lett. 99, 261909 (2011) Study on characteristic parameters influencing laser-induced damage threshold of KH2PO4 crystal surface machined by single point diamond turning J. Appl. Phys. 110, 113103 (2011) Additional information on J. Appl. Phys. The shock pressure generated by the glass confined regime in laser shock peening and its attenuation in the target material are investigated. First, the particle velocity of the target back free surface induced by laser generated shock pressure of this regime is measured using a photonic Doppler velocimetry system. The temporal profile of the particle velocity at the back free surface, where the elastic precursor is captured, manifests a powerful diagnostic capability of this newly developed photonic Doppler velocimetry system for tracking the velocity on short time scales in shock-wave experiments. Second, a coupling pressure analytical model, in which the material constitutive models of confined layers and target material are considered, is proposed to predict the plasma pressure profile at the surface of target. Furthermore, using the predicted shock pressure profile as the input condition, the dynamic response of the target under the shock pressure is simulated by LS-DYNA. The simulated back free surface velocity profile agrees well with that measured by the photonic Doppler velocimetry system. Finally, the attenuation behavior of stress waves and particle velocities in the depth of the target is analyzed, and it indicates an exponential decay. The corresponding empirical formulas for the attenuation behavior are given based on the numerical results.

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Grain refinement of LY2 aluminum alloy induced by ultra-high plastic strain during multiple laser shock processing impacts

Cited by 363 publications

References 28 publications

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Laser shock peening without absorbent coating (LSPwC) effect on 3D surface topography and mechanical properties of 6082-T651 Al alloy

Surface topography evolution of Ni-based single crystal superalloy under laser shock: Formation of the nano-scale surface reliefs

Shock pressure induced by glass-confined laser shock peening: Experiments, modeling and simulation

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