Surface nanocrystallization of metallic alloys with different stacking fault energy induced by laser shock processing

Lou, Shumei; Li, Y.; Zhou, Lian; Nie, Xiangfan; He, Guangyu; He, Weifeng

doi:10.1016/j.matdes.2016.05.028

Cited by 101 publications

(14 citation statements)

References 44 publications

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“…Cheng et al [16] investigated the surface nanocrystallization of a NiTi intermetallic alloy via LSP and found that both strength and ductility are significantly improved through LSP and controlled annealing. A study on the surface nanocrystallization of a TC6 titanium alloy and AISI 304 stainless steel via LSP was conducted by He et al [17]. They discussed the surface nanocrystallization mechanisms of the two metallic alloys and the effects of different stacking fault energies on surface nanocrystallization.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystallization in the Duplex Ti-6Al-4V Alloy Processed by Multiple Laser Shock Peening

Zhou

Ren

Liu

et al. 2016

Metals

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Laser shock peening of titanium alloys has been widely applied in the aerospace industry. However, little is known of the nanocrystalline formation characteristics and mechanisms. In this investigation, a nanocrystalline layer was formed in the duplex Ti-6Al-4V titanium alloy surface region by means of multiple pulsed laser shock peening (LSP). The phase transition and residual stress characteristics of LSP samples were analyzed with X-ray diffraction (XRD) and scanning electron microscopy (SEM). Transmission electron microscopy (TEM) was used to characterize the microstructure and morphologies. As the number of laser pulses increased for each location, higher grain refinement was observed. Micro-hardness testing showed that hardness increased with the number of pulses delivered to each location due to the formation of nanocrystalline layers and high dislocation density in the samples, and a gradient variation of the micro-hardness was obtained. In addition, mechanical twins and different dislocation configurations were formed in the α phase region while only dense dislocation tangles were observed in the β phase region after multiple laser pulse impacts.

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Section: Introductionmentioning

confidence: 99%

Nanocrystallization in the Duplex Ti-6Al-4V Alloy Processed by Multiple Laser Shock Peening

Zhou

Ren

Liu

et al. 2016

Metals

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“…The SAED pattern in the inset of Fig. 6f presents the continuous and homogeneous concentric rings containing some crystalline diffraction spots, and these observed features indicate that the grain size is small and the grains exhibit a random crystallographic orientation [10]. After the RTLSP treatment with three coverage layers, a large number of equiaxed grains with average size ranging from 3 nm to 10 nm form on the top surface, as shown in Fig.…”

Section: Microstructural Observations Of Lsped Specimens At Room Tempmentioning

confidence: 83%

“…In the direction of shock wave decay, refined grain, dislocation structures were presented from the surface to the matrix of TC6 titanium alloy. However, mechanical twinning was prevalent during surface nanocrystallization on the surface layer of AISI 304 stainless steel [10]. High-density dislocations and nanostructures with an average size of 40 nm were also observed in the surface layer after multiple LSP impacts, leading to the high cycle fatigue (HCF) performance of TC11 and TC6 titanium alloys [11,12].…”

Section: Introductionmentioning

confidence: 99%

Tensile properties and surface nanocrystallization analyses of H62 brass subjected to room-temperature and warm laser shock peening

Duan

et al. 2017

Journal of Alloys and Compounds

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The effects of coverage layer and temperature on the tensile properties and surface microstructure of H62 brass subjected to laser shock peening (LSP) were systematically investigated. Ultimate tensile strength, elongation rate, and in-depth microstructural evolutions of three kinds of LSPed specimens, including LSPed specimens with one coverage layer and three coverage layers at room temperature, and one coverage layer at dynamic strain aging temperature, were subsequently measured and characterized. Special attentions were paid to surface nanocrystallization and amorphization of H62 brass subjected to room-temperature LSP and warm LSP technologies for the first time. The formation mechanisms of surface nanocrystallization and amorphization induced by room-temperature LSP and warm LSP were also discussed and completely revealed, and surface nanocrystallization contributed to the improvement of ultimate tensile strength and elongation rate of H62 brass subjected to LSP.

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“…As a new kind of surface treatment method, laser shock processing (LSP) [11] has found an increasing wide utilization in metallic materials for surface strengthening in recent years, and even have been used in technical grade ceramics [12].…”

Section: Introductionmentioning

confidence: 99%

Microstructure characteristics and formation mechanism of TC17 titanium alloy induced by laser shock processing

Yang

Zhang

Qiao

2017

Journal of Alloys and Compounds

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Surface nanocrystallization of metallic alloys with different stacking fault energy induced by laser shock processing

Cited by 101 publications

References 44 publications

Nanocrystallization in the Duplex Ti-6Al-4V Alloy Processed by Multiple Laser Shock Peening

Nanocrystallization in the Duplex Ti-6Al-4V Alloy Processed by Multiple Laser Shock Peening

Tensile properties and surface nanocrystallization analyses of H62 brass subjected to room-temperature and warm laser shock peening

Microstructure characteristics and formation mechanism of TC17 titanium alloy induced by laser shock processing

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