Effects of laser shock peening on stress corrosion behavior of 7075 aluminum alloy laser welded joints

Wang, J.T.; Zhang, Y.K.; Chen, J.F.; Zhou, Jinyu; Ge, Mao-Zhong; Lü, Yalin; Li, X.L.

doi:10.1016/j.msea.2015.08.084

Cited by 95 publications

(16 citation statements)

References 40 publications

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“…Accordingly, the formation of dislocation tangles and walls of dislocations transform into subgrain boundaries within the grains and thereby produce a UFG structure. This is similar to the grain refinement mechanism observed in SPD for various metals including copper processed by HPT [77,78] and it is similar also to the mechanisms reported in a 7075 aluminium alloy processed by laser shock processing (LSP) [79] and Mg/Ti joints by high energy shot peening (HESP) [80]. It follows from Table 1 that grain refinement after dynamic testing is associated with a substantial increase in the dislocation density and this is consistent with earlier studies showing higher dislocation densities produced through the use of multiple SPD procedures [71,81,82].…”

Section: Significance Of Grain Refinement During Dynamic Testingsupporting

confidence: 86%

Characteristics of grain refinement in oxygen-free copper processed by equal-channel angular pressing and dynamic testing

Alawadhi

Sabbaghianrad

Wang

et al. 2020

Materials Science and Engineering: A

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Oxygen-free copper was processed by equal-channel angular pressing (ECAP) at room temperature for 1, 4 and 8 passes and then the ECAP specimens were further deformed by dynamic testing at 298 K using a strain rate of 10 s -1 . Experiments were conducted to investigate the influence of the initial microstructures induced by ECAP on the subsequent grain refinement and mechanical properties after dynamic testing. The results show the strength of copper increased with increasing numbers of ECAP passes and a significant additional grain refinement was produced in the ECAP specimens through the dynamic testing. Thus, the initial grain sizes after ECAP for 1, 4 and 8 passes were ~16, ~4.4 and ~2.9 µm, respectively, and these values were reduced to ~400, ~330 and ~300 nm by dynamic testing, The grains were refined by conventional dislocation processes in the 1-pass specimen but there was evidence for dynamic recrystallization in the specimen processed by 8 passes.

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Section: Significance Of Grain Refinement During Dynamic Testingsupporting

confidence: 86%

Characteristics of grain refinement in oxygen-free copper processed by equal-channel angular pressing and dynamic testing

Alawadhi

Sabbaghianrad

Wang

et al. 2020

Materials Science and Engineering: A

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“…Because of the stacking fault energy (SFC) of 7075-T6 aluminum alloy, the dislocation cross slips easily. 19 Under high strain rate deformation induced by LSP, dislocation accumulates to form subgrain boundaries, thus refining grains.…”

Section: Resultsmentioning

confidence: 99%

Strengthening effect of laser shock peening on 7075-T6 aviation aluminum alloy

Zhang

Cheng

Xia

et al. 2014

Advances in Mechanical Engineering

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The strengthening effect and uniformity of residual stress and strain of 7075-T6 aviation aluminum after laser shock peening were investigated. The finite element simulation model of laser shot peening on 7075-T6 aviation aluminum alloy was established and verified. On this basis and combined with experiment, the microstructure, residual stress distribution and equivalent strain distribution of 7075-T6 aviation aluminum alloy after laser shock peening were studied. An index U for evaluating the strain uniformity in the peened area was proposed based on the statistical processing of the equivalent strain distribution in the peened area. The results show that the average grain size on the peened surface of the specimen was refined to 20–30 μm after LSP, and a residual compressive stress layer with thickness of about 0.5 mm was induced on the surface. Grain refinement and residual compressive stress can promote the strength and fatigue properties of 7075-T6 aviation aluminum alloy. The minimum value of U is obtained in the 6 × 6 spot array (the corresponding overlap ratio is 58%), which suggest that the most uniform deformation peened area can be obtained by using 58% overlap ratio in the laser shot peening process, which can avoid stress concentration and improve fatigue life.

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“…When the average area of the eutectic Si phase gradually decreases, the microhardness of the alloy gradually decreases (table 2). The microhardness variation is related to the average grain size using the Hall-Petch equation [22,23]:…”

Section: Discussionmentioning

confidence: 99%

Effect of (Pr + Ce) addition and T6 heat treatment on microhardness and corrosion of AlSi5Cu1Mg alloy

Zou

Yan

et al. 2020

Mater. Res. Express

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The effects of T6 heat treatment and 0.6 wt% (Pr+Ce) addition on microstructure, microhardness, and corrosion of AlSi5Cu1Mg alloy were investigated. Optical microscopy and scanning electron microscopy revealed that the T6 heat treatment and the addition of 0.6 wt% (Pr+Ce) effectively refined the α-Al and eutectic Si phases, which were uniformly distributed with Al 2 Cu phase in the alloy. Microhardness, weight loss, hydrogen evolution, Tafel polarization, and EIS tests showed that the combination of T6 heat treatment and 0.6 wt% (Pr+Ce) addition resulted in the best corrosion resistance and microhardness of the alloy. The microhardness of the AlSi5Cu1Mg+0.6 wt% (Pr+Ce)/T6 (115 HV) was 27.8% higher than that of the matrix (90 HV). At the same time, the corrosion current density of the alloy also reached the minimum value (38.4 μA cm −2 ). The T6 heat treatment and the addition of (Pr+Ce) can significantly decrease the average grain size, change the redistribution of the precipitated Al 2 Cu phase, refine the Si phase, and increase the pitting formation position, thus reducing the sensitivity of exfoliation corrosion.

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Effects of laser shock peening on stress corrosion behavior of 7075 aluminum alloy laser welded joints

Cited by 95 publications

References 40 publications

Characteristics of grain refinement in oxygen-free copper processed by equal-channel angular pressing and dynamic testing

Characteristics of grain refinement in oxygen-free copper processed by equal-channel angular pressing and dynamic testing

Strengthening effect of laser shock peening on 7075-T6 aviation aluminum alloy

Effect of (Pr + Ce) addition and T6 heat treatment on microhardness and corrosion of AlSi5Cu1Mg alloy

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