Ze Ming Sun

Second Affiliated Hospital & Yuying Children's Hospital of Wenzhou Medical University

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Qi Zhu

Zhejiang University

Zhi Gang Fan

Łukasiewicz Research Network - Institute of Non-Ferrous Metals

Tong Da

University of Pennsylvania

Shufeng Liu

Zhongkai University of Agriculture and Engineering

Dong Hui Zhang

Łukasiewicz Research Network - Institute of Non-Ferrous Metals

Pu Li

Southeast University

V. P. Vavilov

Tomsk Polytechnic University

Wen Xia

University of South China

A.S. Liu

General Research Institute for Nonferrous Metals (China)

Bao Hong Zhu

Chongqing University

Cooperative Institutions

General Research Institute for Nonferrous Metals (China)

Łukasiewicz Research Network - Institute of Non-Ferrous Metals

Tomsk Polytechnic University

Sun Yat-sen University

Second Affiliated Hospital & Yuying Children's Hospital of Wenzhou Medical University

Wenzhou Medical University

National Research Tomsk State University

Zhejiang University

Institute of Strength Physics and Materials Science

Russian Academy of Sciences

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Defect Depth of Thermal Non-Destructive Testing for the Titanium Implants

Advanced materials research (2013)

Qi Zhu Ze Ming Sun Tong Da Pu Li Zhi Gang Fan

In this paper, the results of the first-stage research devoted to infrared thermographic detection of cracks in titanium alloys are presented. In application to the inspection of bottom-hole defects in 9.6 mm-thick Ti6Al4V titanium alloy samples, it has been found that a minimum detected defect should have diameter from one to two times greater than its depth. Images of phase are more noise-resistant and able to reveal deeper defects compared to images of amplitude. The test results obtained show that the Fourier analysis is a convenient data processing technique in active thermal NDT.

Titanium alloy

Thermography

10.4028/www.scientific.net/amr.815.786

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Thermal Non-Destructive Testing for the Titanium Implants

Advanced materials research (2013)

Qi Zhu Ze Ming Sun Tong Da Pu Li Dong Hui Zhang

Active thermal NDT is a promising technique for the detection of structural defects in solids. In this paper, the results of the first-stage research devoted to infrared thermographic detection of cracks in titanium alloys are presented. The test results obtained show that the Fourier analysis is a convenient data processing technique in active thermal NDT. Images of phase are more noise-resistant and able to reveal deeper defects compared to images of amplitude. In application to the inspection of bottom-hole defects in 9.6 mm-thick Ti6Al4V titanium alloy samples, it has been found that a minimum detected defect should have diameter from one to two times greater than its depth.

Titanium alloy

Thermography

10.4028/www.scientific.net/amr.785-786.52

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Study on the Microstructure and Deformation Behavior of Ultrafine-Crystalline Cu-Y Ribbons

Materials science forum (2009)

Zhi Wei Du Ze Ming Sun B.L. Shao A.S. Liu

Cu99.8Y0.2, Cu99.2Y0.8 and Cu98Y2 alloy ribbons were prepared by single roller melt spinning. The microstructure was studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), high voltage electron microscope (HVEM) and high resolution electron microscopy (HREM). The results showed that α-Cu was the dominative phase in the rapid solidification ribbons of three alloys. A secondary phase Cu4Y was detected in the Cu98Y2 ribbon by XRD. The grain size was in a range of 50-200 nm in the Cu99.2Y0.8 and Cu98Y2 ribbons. Many nano-scale twins and some dislocations existed inside the larger grains. However, the grains in Cu99.8Y0.2 ribbon were in the size of microns and the sub-grains with small misorentations were in 100-200 nm. To understand the deformation mechanism, in situ tensile test were carried out at a High Voltage Electron Microscope (HVEM). The results showed that the deformation is predominated by the dislocation slip in larger grains. To accommodate the deformation, elastic deformation occured in the small grains in the initial stage of the deformation. Meanwhile, some small grains maybe deform by grain rotations. With strain increasing, some fractures generated and propagated along the grain boundaries or across the grains.

Ribbon

Deformation mechanism

10.4028/www.scientific.net/msf.610-613.591

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A Mesoscopic Mechanics Research on Deformation of 7B04 High Strength Aluminum Alloy

Key engineering materials (2016)

Ze Ming Sun Qi Zhu Zhi Gang Fan Wen Xia Shufeng Liu

In this paper, a new method mesoscopic been studied for metal material deformation to fracture process. In the polycrystalline material plastic flow process, mesoscopic structural features was obtained for translation - vortex by digital image correlation principle. A preliminary analytical method of material deformation is established. The behavior of plastic deformation of 7B04 high strength aluminum alloy was analyzed. Grain groups deformation, amount of rotation and the energy dissipation distribution were analyzed. An important deformation features is that micro cracks were bred in severe plastic strain region on mesoscopic scale. Based on the stress concentration, the formation of rotational deformation can be regarded as the beginning of an irreversible damage criterion. The Rotation of grain groups is the reason of the formation of microcracks.

Mesoscopic physics

Digital image correlation

Flow stress

10.4028/www.scientific.net/kem.723.15

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Effect of Ultrasonic Surface Peening on Fatigue Property of 7B04 High Strength and Toughness Aluminum Alloy

Materials science forum (2010)

Qi Zhu Ze Ming Sun Tong Da Vacily A. Klimenov Viacheslav Borozna

This paper discusses the influence of ultrasonic surface peening on the fatigue property of 7B04 high strength and toughness aluminum alloy. The results showed that a nano-layer of 10-20 μm was formed after ultrasonic surface peening. This nano-layer had a gradient structure with grain size of 10 to 50nm. Further, the ultrasonic surface peening process created residual compressive stress of 200MPa in this nano-layer. This stress caused micro surface cracks to be compressed or closed . Consequently, after ultrasonic surface peening the fatigue life of 7B04 alloy was extended to 5 times.

Laser peening

Fatigue limit

Surface layer

10.4028/www.scientific.net/msf.654-656.1892

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Evaluation on Microstructure of Aluminum Alloys Dedicated to Plasma Etcher

Materials science forum (2011)

Zhi Hui Zhang Shufeng Liu Ze Ming Sun Xiao Dong Yan

The relationship between microstructure and anodic oxidation film on 6061 aluminum alloy dedicated to plasma etcher were mainly studied by OM, SEM and TEM. The results show that the quality of anodic oxidation film has close relationship with the microstructure of materials, the distribution of element and the morphology of secondary phases. The microstructure of foreign 6061 aluminum alloy is uniform, and there are not obviously segregation and cavity. Two kinds of secondary phases disperse over the grain, one is rich-Fe phase, and the other is Mg 2 Si. Certainly there are also few secondary phases distributing along the grain boundary. The sizes of all secondary phases are almost below 5mm. The size of rich-Fe phases in homemade aluminum alloys are about from 2mm to 15mm, these big-size phases will bring pin-hole defects, which form some channels sending F + etc. into the matrix of aluminum alloy, then not only the equipment will be destroyed at last, but also products will be polluted. The evaluation on microstructure of aluminum alloy will provide scientific basis for nationalization of plasma etcher.

10.4028/www.scientific.net/msf.689.343

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The Grain Rotation Behavior of CuY0.8 Nano Alloys in the Process of Plastic Deformation

Advanced materials research (2011)

Qi Zhu Ze Ming Sun Zhi Gang Fan Dong Hui Zhang В. А. Клименов

In this paper, using a software, prepared by the General Research Institute for Nonferrous Metals to analyze rotation field in materials deformation. By using this software, we analyzed the deformation rotation field in process of tensile for CuY0.8 nano-alloy strip and Nickel-based alloy, and analyzed performed on the rotation behavior, rotation extent and its character among the grains after the polycrystalline metal materials had been yield-deformed, and getting rotation field which is coming with the CuY0.8 nano-alloy strip and nickel-based alloy deformed. It was observed that after plastic deformation, the nano-crystalline grains and its neighborhood occurred a rotation-induced change , the rotation blocks presented on pairs wise as gears, its rotation was in the opposite direction, and in the rotation-pairs region the energy transfer was observed. In the poly-crystalline nickel-based alloy, after plastic deformation among the crystal grains the rotation-pairs occurred in many locations. It is proposed that plastic deformation shows more intensively, the grains rotation angle will is bigger, and in the macroscopic point of view, the generation of Lüders bands is closely related with rotation between grain blocks.

Angle of rotation

Severe Plastic Deformation

10.4028/www.scientific.net/amr.284-286.565

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Comparison of Hidden Blood Loss Between Three Different Surgical Approaches for Treatment of Thoracolumbar Fracture

Journal of Investigative Surgery (2018)

Zexin Chen Ze Ming Sun Chao Jiang Hui Zhang Min Tong

Purpose: To examine the hidden blood loss (HBL) in treatment of AO type A1-A3 thoracolumbar fractures with three different approaches and to explore the influential factors of HBL among patients after the surgery of internal fixation for thoracolumbar fractures. Methods: We retrospectively studied 85 patients in treatment of thoracolumbar fractures: 25 patients via percutaneous approach (Group A), 33 patients via paraspinal approach (Group B), and 27 patients via conventional open approach (Group C). The demographic information of the patients was collected. Each patient's preoperative and postoperative hematocrit were recorded and used for calculating the blood loss according to the Gross's formula. The difference of blood loss between the three groups was measured by ANOVA. And influential factors were further analyzed by multivariate linear regression analysis in each group. Results: The average HBL was 240.0 ± 65.1 mL in Group A, 313.7 ± 138.1 mL in Group B, and 382 ± 153.8 mL in Group C. There was statistical difference in the HBL between three groups (P = 0.000). However, multivariate linear regression analysis revealed that HBL of three approaches was not associated with age, gender, body mass index (BMI), percentage of height loss, percentage of height restoration, fracture type, or operation time. Conclusion: There was a substantial HBL in the treatment of thoracolumbar fractures, which was neglected by surgeons. Further investigation is necessary to study the risk factors for surgery on HBL in treatment of thoracolumbar fractures.

Group B

10.1080/08941939.2018.1458925

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Citations (18)