Surface nanocrystallization and gradient structure developed in the bulk TC4 alloy processed by shot peening

Liu, Yingang; Li, M.Q.; Liu, H.J.

doi:10.1016/j.jallcom.2016.05.295

Cited by 96 publications

(25 citation statements)

References 36 publications

(43 reference statements)

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“…These microstructural features can significantly increase the microhardness of the TC4 alloy, which has been reported in many investigations. [36][37][38][39][40] For example, Liu et al 36,37 considered that the nanocrystallinity and high-density dislocations of the TC4 alloy formed via shot peening could result in remarkable grain refinement strengthening and work-hardening of the alloy, which would significantly improve their surface microhardness. The amorphous metal has no dislocations or GBs, resulting in higher microhardness, showing extraordinary yield strength and microhardness.…”

Section: Microstructural Evolution and Mechanical Properties Of Tc4/zmentioning

confidence: 99%

Microstructures, mechanical, and biological properties of a novel Ti-6V-4V/zinc surface nanocomposite prepared by friction stir processing

Zhu¹,

Lv²,

Qian³

et al. 2018

IJN

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BackgroundThe interaction between the material and the organism affects the survival rate of the orthopedic or dental implant in vivo. Friction stir processing (FSP) is considered a new solid-state processing technology for surface modification.PurposeThis study aims to strengthen the surface mechanical properties and promote the osteogenic capacity of the biomaterial by constructing a Ti-6Al-4V (TC4)/zinc (Zn) surface nanocomposites through FSP.MethodsFSP was used to modify the surface of TC4. The microstructures and mechanical properties were analyzed by scanning electron microscopy, transmission electron microscopy, nanoindentation and Vickers hardness. The biological properties of the modified surface were evaluated by the in vitro and in vivo study.ResultsThe results showed that nanocrystalline and numerous β regions, grain boundary α phase, coarser acicular α phase and finer acicular martensite α′ appeared because of the severe plastic deformation caused by FSP, resulting in a decreased elastic modulus and an increased surface hardness. With the addition of Zn particles and the enhancement of hydrophilicity, the biocompatibility was greatly improved in terms of cell adhesion and proliferation. The in vitro osteogenic differentiation of rat bone marrow stromal cells and rapid in vivo osseointegration were enhanced on the novel TC4/Zn metal matrix nanocomposite surface.ConclusionThese findings suggest that this novel TC4/Zn surface nanocomposite achieved by FSP has significantly improved mechanical properties and biocompatibility, in addition to promoting osseointegration and thus has potential for dental and orthopedic applications.

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Section: Microstructural Evolution and Mechanical Properties Of Tc4/zmentioning

confidence: 99%

Microstructures, mechanical, and biological properties of a novel Ti-6V-4V/zinc surface nanocomposite prepared by friction stir processing

Zhu¹,

Lv²,

Qian³

et al. 2018

IJN

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show abstract

“…They found that the nano-grained surface exhibited a thick nitrogen diffusion layer and high hardness under the same nitriding process. By means of shot peening [8], a gradient nanocrystalline structure with the grain size ranging from the nanometer scale to the micrometer scale was obtained in the bulk coarse-grained TC4 alloy. Bagherifard et al [9,10] used severe shot peening (SSP) to process 316L stainless steel.…”

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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“…As one of the severe plastic deformation methods, shotpeening treatment is also an effective way to refine and uniform the surface microstructures of alloys. 13) Meanwhile, compressive residual stress is also formed on the shot peened alloy surface, which will be of great benefit to the mechanical properties of alloys. However, during shot peening treatment, high-density dislocations, nanograins, and microstrain etc.…”

Section: Introductionmentioning

confidence: 99%

Improving Corrosion Resistance Properties of Nickel-Aluminum Bronze (NAB) Alloys via Shot Peening Treatment

Zhao

Zhang

et al. 2019

Mater. Trans.

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In this paper, Nickel-Aluminum Bronze (NAB) alloy was subjected to the shot-peening (SP) treatment, and the corrosion resistance properties of SPed NAB alloy was systematically studied by scanning electron microscope, transmission electron microscopy, electrochemical workstation and immersion tests. The results show that SP treatment can improve the corrosion resistance properties of NAB alloy by controlling shot peening intensity. The SP treatment can result in rough surfaces, high-density dislocations and grain refinement of ¡ and ¢A martensitic phases in NAB alloy surface. In the corrosion medium, the corrosion resistance properties of SPed NAB alloys are related to not only the surface microstructures but also the surface roughness. The refined and homogenized microstructures favors the rapid formation of the protective passive film and promotes the occurrence of uniform corrosion on shot-peened NAB alloy surface, thus significantly improving their corrosion resistance properties. However, as the shot-peening intensity exceeds a critical value, the higher roughness values due to the large cracks, chips and flaking appearing on the shot-peened sample surface can deteriorate corrosion resistance properties.

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Surface nanocrystallization and gradient structure developed in the bulk TC4 alloy processed by shot peening

Cited by 96 publications

References 36 publications

Microstructures, mechanical, and biological properties of a novel Ti-6V-4V/zinc surface nanocomposite prepared by friction stir processing

Microstructures, mechanical, and biological properties of a novel Ti-6V-4V/zinc surface nanocomposite prepared by friction stir processing

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

Improving Corrosion Resistance Properties of Nickel-Aluminum Bronze (NAB) Alloys via Shot Peening Treatment

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