9 results on '"Xu, Jiale"'
Search Results
2. Fabricating graphene-titanium composites by laser sintering PVA bonding graphene titanium coating: Microstructure and mechanical properties
- Author
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Zhang Min, Qiong Nian, Ma Zhenwu, Guo Huafeng, Xiaonan Wang, Xu Jiale, Changjun Chen, Zengrong Hu, and Feng Chen
- Subjects
Materials science ,Scanning electron microscope ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Industrial and Manufacturing Engineering ,law.invention ,symbols.namesake ,law ,Composite material ,Nanocomposite ,Graphene ,Mechanical Engineering ,021001 nanoscience & nanotechnology ,Microstructure ,0104 chemical sciences ,Selective laser sintering ,chemistry ,Mechanics of Materials ,Vickers hardness test ,Ceramics and Composites ,symbols ,0210 nano-technology ,Raman spectroscopy ,Titanium - Abstract
Graphene reinforced titanium (Ti-Gr) nanocomposite was prepared by laser sintering of the mixture of PVA bonding graphene sheets and titanium powders. During laser sintering process, the survival and uniform dispersion of graphene have been demonstrated, which embedded in Ti matrix, and formed Ti-Gr nanocomposites. Microstructures and components of the nanocomposites were studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS) and Raman spectroscopy. The survival of graphene sheets in nanocomposite is due to rapid heating/cooling in laser sintering process. Hardness measurements showed that the laser sintered Ti-Gr nanocomposites achieved more than 2-fold Vickers Hardness value of barely sintered Ti.
- Published
- 2018
3. Study on laser surface melting of AZ31B magnesium alloy with different ultrasonic vibration amplitude
- Author
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Jianzhong Zhou, Wensheng Tan, He Wenyuan, Shu Huang, Wang Songtao, and Xu Jiale
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010302 applied physics ,Materials science ,General Chemical Engineering ,Metallurgy ,02 engineering and technology ,General Chemistry ,Substrate (electronics) ,021001 nanoscience & nanotechnology ,Laser ,Microstructure ,01 natural sciences ,Indentation hardness ,law.invention ,Corrosion ,Amplitude ,law ,0103 physical sciences ,General Materials Science ,Ultrasonic sensor ,Composite material ,Magnesium alloy ,0210 nano-technology - Abstract
The laser surface melted layers were fabricated on AZ31B magnesium alloy by ultrasonic vibration-assisted using with different vibration amplitude. Microstructural evolution and corrosion resistance were studied systematically. The uniformity and compactness of the microstructure can be get further improved with the increase of vibration amplitude, while the coarse microstructure is observed at an even higher vibration amplitude. The melted layer with a reasonable vibration amplitude at the maximum outputs of 80% possess the highest microhardness, and the lowest corrosion current density as well as the minimal corrosion rate than the substrate. The results of electrochemical impedance spectra (EIS) and corrosion morphology are in agreement with potentiodynamic polarisation measurements, the charge transfer resistance (Rct) and corrosion area of the sample at 80% vibration amplitude are highest and smallest, respectively. Experimental results revealed that the melted layer fabricated at 80% of the ...
- Published
- 2017
4. Microstructure and mechanical properties of Cr12MoV by ultrasonic vibration-assisted laser surface melting
- Author
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Xu Jiale, Zengrong Hu, Meng Xiankai, Yujie Fan, Jianzhong Zhou, and Shu Huang
- Subjects
010302 applied physics ,Equiaxed crystals ,Materials science ,Mechanical Engineering ,Abrasive ,Metallurgy ,02 engineering and technology ,Substrate (electronics) ,Tribology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Microstructure ,01 natural sciences ,Indentation hardness ,Dendrite (crystal) ,Mechanics of Materials ,0103 physical sciences ,General Materials Science ,Composite material ,0210 nano-technology ,Layer (electronics) - Abstract
The effects of laser surface melting assisted by ultrasonic vibration on the microstructure and mechanical properties of Cr12MoV were investigated. Results indicated that the original coarse columnar dendrite can be converted into a fine dendritic and equiaxed. The average microhardness increase from 389HV0.2 to 427HV0.2 resulted from the effect of grain refinement. The friction coefficient was lower than the melted layer without ultrasonic vibration and substrate. Under the same experimental conditions, the width and depth of wear scar were decreased by 19% and 25% than that of without ultrasonic vibration, respectively. The wear mechanism from severe adhesive wear into slight abrasive wear under the action of ultrasonic vibration. Experimental results revealed that melted layer fabricated by ultrasonic vibration exhibit finer and more uniform microstructure as well as superior tribological properties.
- Published
- 2017
5. Effect of laser surface melting with alternating magnetic field on wear and corrosion resistance of magnesium alloy
- Author
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Zengrong Hu, Feng Xu, Jianzhong Zhou, Xu Jiale, Meng Xiankai, and Shu Huang
- Subjects
010302 applied physics ,Materials science ,Magnesium ,Metallurgy ,chemistry.chemical_element ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Microstructure ,01 natural sciences ,Indentation hardness ,Surfaces, Coatings and Films ,Corrosion ,law.invention ,Optical microscope ,chemistry ,law ,0103 physical sciences ,Materials Chemistry ,Nanoindenter ,Magnesium alloy ,0210 nano-technology ,Layer (electronics) - Abstract
Laser surface melting (LSM) with alternating magnetic field was applied to the AZ91D magnesium alloy using a 2 kW fiber laser. The microstructure and phase composition of melted layer with and without alternating magnetic field were studied by optical microscopy (OM) and X-ray diffraction (XRD) measurement. The micro-and nano-hardness, wear and corrosion resistance of the modified layers and as-received magnesium alloy were measured by microhardness tester, nanoindenter, pin-on-disc wear tester and electrochemical workstation, respectively. Results showed that the LSM treatment resulted in a highly homogeneous modified layer with refined grains. Compared to the melted layer without electromagnetic stirring (EMS), the microstructure of melted layer became finer and more uniform, the dendritic crystal was changed to an approximately equiaxial crystal under the action of EMS application treatment. The microhardness of the melted layer with and without EMS (70.8Hv0.1 and 62.9Hv0.1) is higher than the as-received magnesium (55.53Hv0.1) microhardness, regarding especially the melted layer with EMS.·The friction coefficient and wear mass loss of the melted layer with EMS were 0.2175 and 0.1616 g accordingly, subsequently having decreased by 14.8% and 6.1% compared to the melted layer without EMS. From the worn-out appearance of the melted layer without and with EMS, the wear mechanism turning from a slight abrasive wear into a slight plastic deformation during EMS-assisted. The corrosion potential and corrosion current density of the melted layer with EMS were increased by 18.7% and decreased by 4% compared to the corresponding effects without the EMS-assisted, respectively. Experimental results showed that the melted layer assisted by EMS displayed the best wear and corrosion resistance properties.
- Published
- 2017
6. Numerical simulation of temperature field distribution for laser sintering graphene reinforced nickel matrix nanocomposites
- Author
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Mojib Saei, Zengrong Hu, Dong Lin, Gary J. Cheng, Guoquan Tong, Shengyu Jin, Xu Jiale, Yaowu Hu, and Qiong Nian
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010302 applied physics ,Phase transition ,Materials science ,Computer simulation ,Mechanical Engineering ,Metallurgy ,Metals and Alloys ,Sintering ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Finite element method ,law.invention ,Selective laser sintering ,Mechanics of Materials ,law ,Condensed Matter::Superconductivity ,Latent heat ,0103 physical sciences ,Thermal ,Heat transfer ,Materials Chemistry ,0210 nano-technology - Abstract
Transient temperature field distribution is important for quality control of laser sintering graphene (Gr) reinforced nickel matrix (Ni-Gr) nanocomposites and the optimization of sintering parameters. To date, it is difficult to measure the temperature field directly. Thus, numerical simulation was utilized to study the distribution and evolution of temperature field. Finite element models were employed to simulate the sintering process of Ni-Gr coatings on AISI 4140 steel. The temperature distribution, the depth of the melting pool, the width of metallurgical bonding and the parameter optimizing method for laser sintering were investigated. In order to verify simulation results, single-track experiments were performed with the same laser sintering parameters as simulation. Simulated results reveal that convection and radiation heat transfer, and the latent heat of phase transition play a major role in the sintering process. Simulation output is consistent with experiments under the same processing parameters. Based on simulation results, substrate melting depth, metallurgical bonding width and thermal accumulation effects can be predicted. Thus, according to these guidelines, the optimal laser sintering parameters can be decided.
- Published
- 2016
7. Genome Sequence: A Framework for Meta-analysis of Wheat QTLs
- Author
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Xu, Jiale, Dai, Xiongtao, Ramasamy, Ramesh K., Wang, Le, Zhu, Tingting, McGuire, Patrick E., Jorgensen, Chad M., Dehghani, Hamid, Gulick, Patrick J., Luo, Ming-Cheng, Müller, Hans-Georg, and Dvorak, Jan
- Subjects
0106 biological sciences ,Whole genome sequencing ,Genetics ,0303 health sciences ,biology ,Chromosome ,Single-nucleotide polymorphism ,Quantitative trait locus ,biology.organism_classification ,01 natural sciences ,03 medical and health sciences ,Snp markers ,Head blight ,SNP ,Aegilops tauschii ,Molecular Biology ,Genetics (clinical) ,030304 developmental biology ,010606 plant biology & botany - Abstract
Numerous quantitative trait loci (QTL) have been mapped in tetraploid and hexaploid wheat and wheat relatives, mostly with simple sequence repeat (SSR) or single nucleotide polymorphism (SNP) markers. To conduct meta-analysis of QTL requires projecting them onto a common genomic framework, either a consensus genetic map or genomic sequence. The latter strategy is pursued here. Of 774 QTL mapped in wheat and wheat relatives found in the literature, 585 (75.6%) were successfully projected onto the Aegilops tauschii pseudomolecules. QTL mapped with SNP markers were more successfully projected (92.2%) than those mapped with SSR markers (66.2%). The QTL were not distributed homogeneously along chromosome arms. Their frequencies increased in the proximal-to-distal direction but declined in the most distal regions and were weakly correlated with recombination rates along the chromosome arms. Databases for projected SSR markers and QTL were constructed and incorporated into the Ae. tauschii JBrowse. To facilitate meta-QTL analysis, eight clusters of QTL were used to estimate standard deviations ([Formula: see text]) of independently mapped QTL projected onto the Ae. tauschii genome sequence. The standard deviations [Formula: see text] were modeled as an exponential decay function of recombination rates along the Ae. tauschii chromosomes. We implemented four hypothesis tests for determining the membership of query QTL. The hypothesis tests and estimation procedure for [Formula: see text] were implemented in a web portal for meta-analysis of projected QTL. Twenty-one QTL for Fusarium head blight resistance mapped on wheat chromosomes 3A, 3B, and 3D were analyzed to illustrate the use of the portal for meta-QTL analyses.
- Published
- 2019
- Full Text
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8. Laser sintered single layer graphene oxide reinforced titanium matrix nanocomposites
- Author
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Guoquan Tong, Xu Jiale, Zhang Min, Mojib Saei, Rong Xu, Qiong Nian, Zengrong Hu, Changjun Chen, Guo Huafeng, and Feng Chen
- Subjects
Materials science ,Scanning electron microscope ,Oxide ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Industrial and Manufacturing Engineering ,law.invention ,symbols.namesake ,chemistry.chemical_compound ,law ,Composite material ,Graphene oxide paper ,Graphene ,Mechanical Engineering ,Nanoindentation ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Selective laser sintering ,chemistry ,Mechanics of Materials ,Ceramics and Composites ,symbols ,0210 nano-technology ,Raman spectroscopy ,Titanium - Abstract
Single layer graphene oxide (SLGO) reinforced titanium (SLGO-Ti) nanocomposites have been achieved by laser sintering. This study focuses on the graphene oxide dispersion and survival in titanium matrix during laser sintering process. Through laser sintering, graphene oxides were dispersed uniformly into titanium matrix to fabricate SLGO-Ti nanocomposites. Microstructures and components of the nanocomposites were studied using scanning electron microscopy (SEM), X-ray diffraction (XRD), Energy-dispersive X-Ray spectroscopy (EDS) and Raman spectroscopy. It was confirmed by XRD patterns, EDS maps and Raman spectrum that graphene oxide survived in SLGO-Ti nanocomposites after laser sintering. Nanoindentation measurements showed the laser sintered SLGO-Ti nanocomposites hardness was improved by more than 3-folds than that of pure titanium counterpart.
- Published
- 2016
9. Influence of Magnetic Field on Properties of Fe/Al Dissimilar Metal Laser Welding Joints
- Author
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谭文胜 Tan Wensheng, 黄舒 Huang Shu, 周建忠 Zhou Jianzhong, 丁浩 Ding Hao, and 徐家乐 Xu Jiale
- Subjects
Materials science ,Dissimilar metal ,Laser beam welding ,02 engineering and technology ,Welding ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Magnetic field ,010309 optics ,law ,0103 physical sciences ,Electrical and Electronic Engineering ,Composite material ,0210 nano-technology - Published
- 2017
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