Grain refinement progress of pure titanium during laser shock forming (LSF) and mechanical property characterizations with nanoindentation

Liu, H.X.; Hu, Yang; Wang, X.; Shen, Zong Bao; Li, P.; Gu, Chunxing; Liu, H.; Du, Daozhong; Guo, Chunhui

doi:10.1016/j.msea.2012.11.087

Cited by 58 publications

(8 citation statements)

References 38 publications

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“…2c), and transforming into nanometer crystallite, as seen in Figure 2c. This process serves to minimize the system energy of the CT crystal during the cyclic deformation, which is in good agreement with the previous reports [15,16]. Due to the blocking effect for deformation by the dislocation tangles, the cell structure and the nanoscale crystallite induced by stress, resistance to deformation of the deformed mc-36.9 model is more than that of the pristine crystal.…”

supporting

confidence: 90%

Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

et al. 2014

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supporting

confidence: 90%

Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

et al. 2014

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“…The α phase of the Ti-6Al-4V alloy has a hexagonal close-packed (hcp) crystal structure, and only four independent slip systems are available in the α phase. According to the Von-Mises rule, five independent slip systems are necessary to maintain plastic deformation compatibility [24][25][26]. Therefore, hcp metals usually need other deformations, such as twinning, to accommodate the plastic deformation.…”

Section: Microstructure Characteristicsmentioning

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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“…This evolution process forms small grains with free orientation, thereby refining the grains. 32,33 With so many microscopic defects, laser oxidation firstly forms TiO6 octahedra with great distortion, and adjacent octahedra forms anatase nanocrystals in the manner of cis-coordination. However, due to the short action time of nanosecond laser and unsustainable heat, there will be a large number of anatase that can't complete the transformation to rutile.…”

Section: Characterization Of Texture Morphology Of Specimen Surfacementioning

confidence: 99%

Laser hexagonal texture on surface of Ti6Al4V for the improvement of fluid spreadability and tribological properties

Liu

Yuan

Jiang

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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The joint capsule removal after artificial joint replacement surgery have led to improper lubrication, causing the pair to wear out quickly and reducing the joint lifespan. In this paper, laser processing and chemical corrosion were used to prepare a hexagonal convex texture on the surface of titanium alloy (Ti6Al4V). After etching and laser polishing, SEM images indicated the presence of secondary micro-nano textures in the grooves around the hexagonal texture, and the formation of anatase oxides on the surface, resulting in an increase of the surface energy and a very small contact angle (CA). The surfaces’ CA increases with the texture ratio, and the surface is super-hydrophilic when the texture ratio is less than 0.84. Furthermore, the effect of texture parameters and directions are studied by using UHMWPE and Ti6Al4V as friction pairs and simulated body fluid as lubricant. The COF is 0.068 with 0.84 area ratio, which is 51.4% lower than the original surface. The wear rate of UHMWPE on the textured surface decreases by 74.5% after two hours of tribological testing. In addition, high speed camera images and calculation results proved that creating grooves can promote fluid distribution on the textured surface. The surface texture on titanium alloy results in a significant COF and wear reduction, extending the service life of artificial joints.

show abstract

Grain refinement progress of pure titanium during laser shock forming (LSF) and mechanical property characterizations with nanoindentation

Cited by 58 publications

References 38 publications

Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

Deformation and crack mechanisms of nanotwinned cadmium telluride under cyclic nanoindentations

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

Laser hexagonal texture on surface of Ti6Al4V for the improvement of fluid spreadability and tribological properties

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