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A peak position comparison method for high-speed quantitative Laue microdiffraction data processing EI SCIE Scopus
期刊论文 | 2018 , 143 , 49-53 | SCRIPTA MATERIALIA
WoS CC Cited Count: 1
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Abstract :

Indexing Laue patterns of a synchrotron microdiffraction scan can take as much as ten times longer than collecting the data, impeding efficient structural analysis using this technique. Here a novel strategy is developed. By comparing the peak positions of adjacent Laue patterns and checking the intensity sequence, grain and phase boundaries are identified, requiring only a limited number of indexing steps for each individual grain. Using this protocol, the Laue patterns can be indexed on the fly as they are taken. The validation of this method is demonstrated by analyzing the microstructure of a laser 3D printed multi-phase/multi-grain Ni-based superalloy. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Orientation mapping Polychromatic X-ray Laue microdiffraction Plastic deformation Phase distribution

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GB/T 7714 Kou, Jiawei , Chen, Kai , Tamura, Nobumichi . A peak position comparison method for high-speed quantitative Laue microdiffraction data processing [J]. | SCRIPTA MATERIALIA , 2018 , 143 : 49-53 .
MLA Kou, Jiawei 等. "A peak position comparison method for high-speed quantitative Laue microdiffraction data processing" . | SCRIPTA MATERIALIA 143 (2018) : 49-53 .
APA Kou, Jiawei , Chen, Kai , Tamura, Nobumichi . A peak position comparison method for high-speed quantitative Laue microdiffraction data processing . | SCRIPTA MATERIALIA , 2018 , 143 , 49-53 .
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Mechanism of heat affected zone cracking in Ni-based superalloy DZ125L fabricated by laser 3D printing technique EI SCIE Scopus
期刊论文 | 2018 , 150 , 171-181 | MATERIALS & DESIGN
SCOPUS Cited Count: 1
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Abstract :

Laser 3D printing is a promising technique to repair damaged Ni-based superalloy components. However, the occurrence of heat affected zone (HAZ) cracking severely limits its applicability. Here we unravel the cracking mechanismby studying the element, phase, defect, and strain distribution around an intergranular crack that initiated from the primary HAZ. Using synchrotron X-ray Laue microdiffraction, we measured high tensile strain/stress transverse to the building direction in both the primary HAZ and the cladding layers, as well as highdensity dislocations, which resulted from the thermal contraction and rapid precipitation of gamma' phase. The crack initiated because the transverse tensile strain/stress tore up the liquid film formed by the low-melting point preexisting phases in the primary HAZ, such as gamma/gamma' eutectics and coarse gamma' precipitates. The incoherent carbide particles were frequently observed near the crack root as local strain concentrators. In the cladding layers, micro-segregation could not be completely avoided, thus the hot crack continued to propagate over several layers with the assistance of the transverse tensile stress. Our investigations provide a useful guideline for the optimization of the 3D printing process to repair Ni-based superalloys with high susceptibility to hot cracking. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Laser 3D printing Residual strain/stress Ni-based superalloy HAZ cracking Synchrotron X-ray microdiffraction

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GB/T 7714 Li, Yao , Chen, Kai , Tamura, Nobumichi . Mechanism of heat affected zone cracking in Ni-based superalloy DZ125L fabricated by laser 3D printing technique [J]. | MATERIALS & DESIGN , 2018 , 150 : 171-181 .
MLA Li, Yao 等. "Mechanism of heat affected zone cracking in Ni-based superalloy DZ125L fabricated by laser 3D printing technique" . | MATERIALS & DESIGN 150 (2018) : 171-181 .
APA Li, Yao , Chen, Kai , Tamura, Nobumichi . Mechanism of heat affected zone cracking in Ni-based superalloy DZ125L fabricated by laser 3D printing technique . | MATERIALS & DESIGN , 2018 , 150 , 171-181 .
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A study of deformation and strain induced in bulk by the oxide layers formation on a Fe-Cr-Al alloy in high-temperature liquid Pb-Bi eutectic EI SCIE Scopus
期刊论文 | 2018 , 151 , 301-309 | ACTA MATERIALIA
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Abstract :

At elevated temperatures, heavy liquid metals and their alloys are known to create a highly corrosive environment that causes irreversible degradation of most iron-based materials. It has been found that an appropriate concentration of oxygen in the liquid alloy can significantly reduce this issue by creating a passivating oxide scale that controls diffusion, especially if Al is present in Fe-based materials (by Al-oxide formation). However, the increase of the temperature and of oxygen content in liquid phase leads to the increase of oxygen diffusion into bulk, and to promotion of the internal Al oxidation. This can cause a strain in bulk near the oxide layer, due either to mismatch between the thermal expansion coefficients of the oxides and bulk material, or to misfit of the crystal lattices (bulk vs. oxides). This work investigates the strain induced into proximal bulk of a Fe-Cr-Al alloy by oxide layers formation in liquid lead-bismuth eutectic utilizing synchrotron X-ray Laue microdiffraction. It is found that internal oxidation is the most likely cause for the strain in the metal rather than thermal expansion mismatch as a two-layer problem. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Laue X-ray microdiffraction Strain FeCrAl alloy Oxidation Thermal constriction

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GB/T 7714 Popovic, M. P. , Chen, K. , Shen, H. et al. A study of deformation and strain induced in bulk by the oxide layers formation on a Fe-Cr-Al alloy in high-temperature liquid Pb-Bi eutectic [J]. | ACTA MATERIALIA , 2018 , 151 : 301-309 .
MLA Popovic, M. P. et al. "A study of deformation and strain induced in bulk by the oxide layers formation on a Fe-Cr-Al alloy in high-temperature liquid Pb-Bi eutectic" . | ACTA MATERIALIA 151 (2018) : 301-309 .
APA Popovic, M. P. , Chen, K. , Shen, H. , Stan, C. V. , Olmsted, D. L. , Tamura, N. et al. A study of deformation and strain induced in bulk by the oxide layers formation on a Fe-Cr-Al alloy in high-temperature liquid Pb-Bi eutectic . | ACTA MATERIALIA , 2018 , 151 , 301-309 .
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Bimodal laminated Ti3Al matrix composite achieved by in situ formed Ti5Si3 reinforcements EI SCIE Scopus
期刊论文 | 2017 , 707 , 419-425 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | IF: 3.414
WoS CC Cited Count: 2
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Abstract :

The low density and high-temperature mechanical properties of intermetallic Ti3Al based alloys are highly desirable for a wide range of critical applications. In this paper, we designed and prepared a novel laminated Ti5Si3/Ti3Al composite (LTTC) consisting of alternating Ti5Si3-lean/coarse-grained Ti3Al layers (TCLs) and Ti5Si3-rich/fine-grained Ti3Al layers (TFLs). The processing route involves hot pressing of a stack of alternating Ti foils and Al-6Si foils, followed by a two-step reaction annealing. The tensile properties of the LTTC have also been evaluated, and the LTTC exhibited a good strength-ductility combination when compared with monolithic Ti3Al. By in-depth mechanism discussion, we propose the possible approaches to further enhance the mechanical properties of such LTTC.

Keyword :

Mechanical properties Phase transformation Microstructure Intermetallics

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GB/T 7714 Zhang, Tongtong , Fan, Guohua , Miao, Kesong et al. Bimodal laminated Ti3Al matrix composite achieved by in situ formed Ti5Si3 reinforcements [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2017 , 707 : 419-425 .
MLA Zhang, Tongtong et al. "Bimodal laminated Ti3Al matrix composite achieved by in situ formed Ti5Si3 reinforcements" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 707 (2017) : 419-425 .
APA Zhang, Tongtong , Fan, Guohua , Miao, Kesong , Chen, Kai , Pan, Zhihao , Chen, Shuai et al. Bimodal laminated Ti3Al matrix composite achieved by in situ formed Ti5Si3 reinforcements . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2017 , 707 , 419-425 .
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Investigation of the 2312 flexoelectric coefficient component of polyvinylidene fluoride: Deduction, simulation, and mensuration SCIE PubMed Scopus
期刊论文 | 2017 , 7 | SCIENTIFIC REPORTS | IF: 4.122
WoS CC Cited Count: 2
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Flexoelectric effects hold promising applications in sensing, actuating, and energy capturing, and thus it is demanded to measure the flexoelectric coefficient tensors of dielectric materials accurately. In this work, an approach to measuring the effective flexoelectric coefficient tensor component mu(2312) of polymeric materials is developed by imposing a torque load upon a half cylindrical specimen. It is proven that mu(2312) can be calculated by assessing the electric charge on the axial plane and the strain gradient along the radial direction, both induced by the torque. To overcome the difficulty in experimental measurements, the relationship between the strain gradient and torque is deduced theoretically and further verified with finite element analysis. This approach is applied to testing bars machined from bulk polyvinylidene fluoride (PVDF). Potential errors from the piezoelectric effects and the non-uniform strain gradient are discussed to verify the validity of the measurement. The experimental results show good reproducibility and agreement with other measured effective flexoelectric tensor components of PVDF. This work indicates a potential application of PVDF-based mechanical sensors and provides a method to investigate the effective flexoelectric coefficient component of polymers.

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GB/T 7714 Zhang, Shuwen , Liu, Kaiyuan , Xu, Minglong et al. Investigation of the 2312 flexoelectric coefficient component of polyvinylidene fluoride: Deduction, simulation, and mensuration [J]. | SCIENTIFIC REPORTS , 2017 , 7 .
MLA Zhang, Shuwen et al. "Investigation of the 2312 flexoelectric coefficient component of polyvinylidene fluoride: Deduction, simulation, and mensuration" . | SCIENTIFIC REPORTS 7 (2017) .
APA Zhang, Shuwen , Liu, Kaiyuan , Xu, Minglong , Shen, Hao , Chen, Kai , Feng, Bo et al. Investigation of the 2312 flexoelectric coefficient component of polyvinylidene fluoride: Deduction, simulation, and mensuration . | SCIENTIFIC REPORTS , 2017 , 7 .
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Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy SCIE PubMed Scopus
期刊论文 | 2017 , 7 | SCIENTIFIC REPORTS | IF: 4.122
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Ductility-dip cracking in Ni-based superalloy, resulting from heat treatment, is known to cause disastrous failure, but its mechanism is still not completely clear. A statistical study of the cracking behavior as a function of crystal orientation in a laser 3D-printed DL125L Ni-based superalloy polycrystal is investigated here using the synchrotron X-ray microdiffraction. The dislocation slip system in each of the forty crystal grains adjacent to the 300 mu m long crack has been analyzed through Laue diffraction peak shapes. In all these grains, edge-type geometrically necessary dislocations (GNDs) dominate, and their dislocation line directions are almost parallel to the crack plane. Based on Schmid's law, the equivalent uniaxial tensile force direction is revealed normal to the trace of the crack. A qualitative mechanism is thus proposed. Thermal tensile stress perpendicular to the laser scanning direction is elevated due to a significant temperature gradient, and thus locations in the materials where the thermal stress exceeds the yield stress undergo plastic deformation mediated by GND activations. As the dislocations slip inside the crystal grains and pile up at the grain boundaries, local strain/stress keeps increasing, until the materials in these regions fail to sustain further deformation, leading to voids formation and cracks propagation.

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GB/T 7714 Qian, Dan , Xue, Jiawei , Zhang, Anfeng et al. Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy [J]. | SCIENTIFIC REPORTS , 2017 , 7 .
MLA Qian, Dan et al. "Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy" . | SCIENTIFIC REPORTS 7 (2017) .
APA Qian, Dan , Xue, Jiawei , Zhang, Anfeng , Li, Yao , Tamura, Nobumichi , Song, Zhongxiao et al. Statistical study of ductility-dip cracking induced plastic deformation in polycrystalline laser 3D printed Ni-based superalloy . | SCIENTIFIC REPORTS , 2017 , 7 .
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Frontiers of synchrotron research in materials science EI SCIE Scopus
期刊论文 | 2016 , 41 (6) , 435-444 | MRS BULLETIN | IF: 5.199
WoS CC Cited Count: 7
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Synchrotron radiation has evolved tremendously in recent decades in sources, instrumentation, and applications in materials studies. This article provides background and an introduction to the state of the art of synchrotron research as it relates to materials research, including an overview of the articles in this MRS Bulletin issue, which focus on Laue microdiffraction, high-energy x-ray diffraction on battery materials, synchrotron radiation in high-pressure research, x-ray dark-field microscopy, and x-ray absorption spectroscopy applied to energy research. The modern approach of displaying diffraction data in reciprocal-space units and the distinction between spectroscopy and diffraction are summarized. Applications and technologies are continuously developing toward technical and optical limits, combining multiple methods for an even brighter future for this field. It is now time for expert groups to begin applying multiple and different kinds of quantum beams, such as neutrons, muons, electrons, and ions, complementary to synchrotron radiation for more efficient and effective characterization of materials.

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GB/T 7714 Liss, Klaus-Dieter , Chen, Kai . Frontiers of synchrotron research in materials science [J]. | MRS BULLETIN , 2016 , 41 (6) : 435-444 .
MLA Liss, Klaus-Dieter et al. "Frontiers of synchrotron research in materials science" . | MRS BULLETIN 41 . 6 (2016) : 435-444 .
APA Liss, Klaus-Dieter , Chen, Kai . Frontiers of synchrotron research in materials science . | MRS BULLETIN , 2016 , 41 (6) , 435-444 .
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Real-time microstructure imaging by Laue microdiffraction: A sample application in laser 3D printed Ni-based superalloys SCIE PubMed Scopus
期刊论文 | 2016 , 6 | SCIENTIFIC REPORTS | IF: 4.259
WoS CC Cited Count: 7
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Synchrotron-based Laue microdiffraction has been widely applied to characterize the local crystal structure, orientation, and defects of inhomogeneous polycrystalline solids by raster scanning them under a micro/nano focused polychromatic X-ray probe. In a typical experiment, a large number of Laue diffraction patterns are collected, requiring novel data reduction and analysis approaches, especially for researchers who do not have access to fast parallel computing capabilities. In this article, a novel approach is developed by plotting the distributions of the average recorded intensity and the average filtered intensity of the Laue patterns. Visualization of the characteristic microstructural features is realized in real time during data collection. As an example, this method is applied to image key features such as microcracks, carbides, heat affected zone, and dendrites in a laser assisted 3D printed Ni-based superalloy, at a speed much faster than data collection. Such analytical approach remains valid for a wide range of crystalline solids, and therefore extends the application range of the Laue microdiffraction technique to problems where real-time decision-making during experiment is crucial (for instance time-resolved non-reversible experiments).

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GB/T 7714 Zhou, Guangni , Zhu, Wenxin , Shen, Hao et al. Real-time microstructure imaging by Laue microdiffraction: A sample application in laser 3D printed Ni-based superalloys [J]. | SCIENTIFIC REPORTS , 2016 , 6 .
MLA Zhou, Guangni et al. "Real-time microstructure imaging by Laue microdiffraction: A sample application in laser 3D printed Ni-based superalloys" . | SCIENTIFIC REPORTS 6 (2016) .
APA Zhou, Guangni , Zhu, Wenxin , Shen, Hao , Li, Yao , Zhang, Anfeng , Tamura, Nobumichi et al. Real-time microstructure imaging by Laue microdiffraction: A sample application in laser 3D printed Ni-based superalloys . | SCIENTIFIC REPORTS , 2016 , 6 .
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Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy EI SCIE Scopus
期刊论文 | 2016 , 109 (10) , 74-78 | APPLIED PHYSICS LETTERS | IF: 3.411
WoS CC Cited Count: 3
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In this letter, microstructural and mechanical inhomogeneities, a great concern for single crystal Ni-based superalloys repaired by laser assisted 3D printing, have been probed near the epitaxial interface. Nanoindentation tests show the hardness to be uniformly lower in the bulk of the substrate and constantly higher in the epitaxial cladding layer. A gradient of hardness through the heat affected zone is also observed, resulting from an increase in dislocation density, as indicated by the broadening of the synchrotron X-ray Laue microdiffraction reflections. The hardening mechanism of the cladding region, on the other hand, is shown to originate not only from high dislocation density but also and more importantly from the fine gamma/gamma' microstructure. Published by AIP Publishing.

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GB/T 7714 Qian, Dan , Zhang, Anfeng , Zhu, Jianxue et al. Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy [J]. | APPLIED PHYSICS LETTERS , 2016 , 109 (10) : 74-78 .
MLA Qian, Dan et al. "Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy" . | APPLIED PHYSICS LETTERS 109 . 10 (2016) : 74-78 .
APA Qian, Dan , Zhang, Anfeng , Zhu, Jianxue , Li, Yao , Zhu, Wenxin , Qi, Baolu et al. Hardness and microstructural inhomogeneity at the epitaxial interface of laser 3D-printed Ni-based superalloy . | APPLIED PHYSICS LETTERS , 2016 , 109 (10) , 74-78 .
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In situ synchrotron study of electromigration induced grain rotations in Sn solder joints SCIE PubMed Scopus
期刊论文 | 2016 , 6 | SCIENTIFIC REPORTS | IF: 4.259
WoS CC Cited Count: 8
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Here we report an in situ study of the early stage of microstructure evolution induced by electromigration in a Pb-free beta-Sn based solder joint by synchrotron polychromatic X-ray microdiffraction. With this technique, crystal orientation evolution is monitored at intragranular levels with high spatial and angular resolution. During the entire experiment, no crystal growth is detected, and rigid grain rotation is observed only in the two grains within the current crowding region, where high density and divergence of electric current occur. Theoretical calculation indicates that the trend of electrical resistance drop still holds under the present conditions in the grain with high electrical resistivity, while the other grain with low resistivity reorients to align its a-axis more parallel with the ones of its neighboring grains. A detailed study of dislocation densities and subgrain boundaries suggests that grain rotation in beta-Sn, unlike grain rotation in high melting temperature metals which undergo displacive deformation, is accomplished via diffusional process mainly, due to the high homologous temperature.

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GB/T 7714 Shen, Hao , Zhu, Wenxin , Li, Yao et al. In situ synchrotron study of electromigration induced grain rotations in Sn solder joints [J]. | SCIENTIFIC REPORTS , 2016 , 6 .
MLA Shen, Hao et al. "In situ synchrotron study of electromigration induced grain rotations in Sn solder joints" . | SCIENTIFIC REPORTS 6 (2016) .
APA Shen, Hao , Zhu, Wenxin , Li, Yao , Tamura, Nobumichi , Chen, Kai . In situ synchrotron study of electromigration induced grain rotations in Sn solder joints . | SCIENTIFIC REPORTS , 2016 , 6 .
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