Xiaofeng Zhao

Heilongjiang University

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i-10 index

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Co-Authors

Ping Xiao

Henry Royce Institute

121

Fangwei Guo

Shanghai Jiao Tong University

Ying Chen

North China University of Science and Technology

Xiao Shan

Shanghai Jiao Tong University

Lirong Luo

Shanghai Jiao Tong University

Jie Lu

State Grid Corporation of China (China)

Na Ni

Shanghai Jiao Tong University

Huangyue Cai

Shanghai Jiao Tong University

Yingzheng Liu

Shanghai Jiao Tong University

Di Peng

Shanghai Jiao Tong University

Cooperative Institutions

Shanghai Jiao Tong University

174

Chinese Academy of Sciences

121

University of Chinese Academy of Sciences

Tsinghua University

University of Manchester

Harbin Institute of Technology

Central South University

Huazhong University of Science and Technology

Shandong University

Shandong University of Science and Technology

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The effect of ferroelastic domains and ultrahigh‐density dislocations on fracture toughness of high entropy niobates

Journal of the American Ceramic Society (2023)

Panpan Wang Huangyue Cai Muzhi Li Lirong Luo Xiaofeng Zhao

Abstract This study investigates the fracture toughness and toughening mechanism of (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Y 0.2 )NbO 4 , a high entropy material characterized by a high thermal expansion coefficient and low thermal conductivity. Our finding demonstrates a noteworthy 50% increase in fracture toughness for (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Y 0.2 )NbO 4 (∼3.09 MPa m 0.5 ) compared to YNbO 4 (∼2.11 MPa m 0.5 ). The superior fracture toughness for (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Y 0.2 )NbO 4 can be attributed to the two key factors: relatively easy ferroelastic domain switching and the presence of ultrahigh‐density dislocations (∼7 × 10 8 mm −2 ). The enhanced ferroelastic toughening in (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Y 0.2 )NbO 4 is associated with its distinct characteristics, large atomic radius ( R A ), significant tetragonality ( c / a ratio), and low monoclinic β angle. These factors contribute to larger spontaneous strain, larger coercive strain, and lower transformation strain, respectively. These properties facilitate the formation and switching of the ferroelastic domains. In addition, the interactions between the large strain field surrounding the dislocations and the cracks facilitate crack deflection and bridging. The combined effect of ferroelastic toughening and ultrahigh‐density dislocations ultimately leads to the significant improvement in the fracture toughness of (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Y 0.2 )NbO 4 .

Natural bond orbital

Monoclinic crystal system

Toughening

10.1111/jace.19545

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Citations (3)

Improving the durability and investing failure behavior of TBCs under thermal cycling-CMAS test by Yb2O3 and Y2O3 co-stabilized ZrO2 materials and different processes

Ceramics International (2024)

Yangguang Liu Wenkang Zhang Weize Wang Wei Liu Ting Yang

Temperature cycling

Cycling

10.1016/j.ceramint.2024.09.250

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Citations (0)

IYOLO: Multi-scale infrared target detection method based on bidirectional feature fusion

Journal of Physics Conference Series (2021)

Xiaofeng Zhao Yebin Xu Fei Wu Wei Cai Zhili Zhang

Abstract Convolutional neural networks are advanced computer vision solution for various tasks, and have made considerable progress. In order to detect infrared targets with details and texture features, we propose a detection method based on YOLOv3. First, we propose a bidirectional feature fusion structure called Improve-FPN(Im-FPN), which allows fast and efficient multi-scale feature fusion. Second, we use the Focal Loss(FL) loss function to balance the problem of sample imbalance. Based on these optimizations, an Infrared-YOLO (IYOLO) target detection model for infrared target is constructed. On the self-constructed infrared dataset: Infrared-VOC, the mAP of IYOLO can achieve 77.1%, which is 4.0% higher than YOLOv3, and the detection speed can reach 55.6FPS. Experimental results show that this method can improve the overall accuracy of detection while ensuring real-time detection.

Feature (linguistics)

10.1088/1742-6596/1873/1/012020

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Citations (3)

Thermal history sensing from 1000 °C to 1400 °C based on phase transformation from Y3Al5O12 and Y4Al2O9 to YAlO3 through the intensity ratio method

Ceramics International (2024)

Muzhi Li Huangyue Cai Panpan Wang Weilun Cheng Hanchao Zhang

Intensity

Emission intensity

10.1016/j.ceramint.2024.03.092

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Citations (2)

Measurements of elastic modulus and fracture toughness of an air plasma sprayed thermal barrier coating using micro-cantilever bending

Surface and Coatings Technology (2019)

Ying Chen Xun Zhang Xiaofeng Zhao Nicolaie Markocsan Per Nylén

Microscale chemistry

10.1016/j.surfcoat.2019.05.031

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Citations (30)

A highly strain and damage‐tolerant thermal barrier coating fabricated by electro‐sprayed zirconia hollow spheres

Journal of the American Ceramic Society (2018)

Zhonghua Zou Chen Xing Limin He Xiao Shan Lirong Luo

Abstract An approach to make air plasma sprayed ( APS ) thermal barrier coatings ( TBC s) with the enhanced strain and damage tolerance was reported, using a novel hollow spheres produced by electro‐spraying ( ESP ) technique. Compared with agglomerated & sintered (A&S) and hollow spherical ( HOSP ) yttria‐stabilized zirconia ( YSZ ) powders, the ESP powder showed a unique network microstructure and the TBC s exhibited a 2‐3 times longer thermal cycling lifetime. The splat morphology and the top coats microstructure were investigated. Some semi‐melted ESP particles were observed in the as‐sprayed top coat. The indentation coupled with the Raman mapping technique was employed to evaluate the strain and damage tolerance of the TBC s. The coatings deposited by the ESP powder show a lower in‐plane stiffness determined by three‐point bending tests. It is proposed that the superior performance is attributed to the lower amount of the short microcracks (0.5‐4 μm) with low angle (<45°) and the semi‐melted ESP particles remained in the YSZ top coat.

Temperature cycling

Indentation

Thermal shock

10.1111/jace.15697

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Citations (31)

Stress evaluation of TBCs with inclined film-cooling hole considering CMAS penetration-induced change of thermo-mechanical properties

Engineering Failure Analysis (2023)

Zhenwei Cai Qiao Lijie Xiaofeng Zhao Weizhe Wang

Penetration (warfare)

10.1016/j.engfailanal.2023.107340

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Citations (4)

Accurate linearized models for Saturated Transformer of LCC-HVDC under Two Types of DC-Biased Currents

IET conference proceedings. (2021)

X. Chen Tianxiang Liu S. Wang Qin Xin Xiaofeng Zhao

This paper derives accurate linearized models for saturated transformer of line commutated converter based high voltage direct current (LCC-HVDC) transmission system under two types of DC-biased currents. Firstly, the linearized model of saturated single-phase transformer is theoretically elaborated by a simplified nonlinear magnetic curve. Developing the analyzed method for single-phase transformer to three-phase transformer, the linearized models for saturated three-phase transformer under two types of DC-biased currents are mathematically derived. Furthermore, by circulation path analyzing, the DC-biased harmonic instability of LCC-HVDC can be triggered by converter modulated DC-biased current also is systematically analyzed. The simulation tests by PSCAD/EMTDC are performed to verify the correctness of the theoretical analysis. The consistency between the simulation results and theoretical analysis verifies the effectiveness of the proposed theory.

DC bias

Three-phase

10.1049/icp.2021.2217

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Citations (1)

Mechanical Response of Hierarchical Ysz Membranes with Multi-Scale Voids and Anisometric Macro-Void

SSRN Electronic Journal (2022)

Huangyue Cai Zifan Zhang Xiao Shan Xin Wang Xiaohui Fan

Mechanically strong but highly porous structured ceramics are desirable for a range of applications like water purification and energy conversion. Yttria-stabilized zirconia membranes, possessing a hierarchical arrangement of voids from hundreds of micrometers to nanometers, were prepared by a non-solvent induced phase separation technique. Effects of the multi-scale voids on stress distributions and related mechanical properties were experimentally studied and simulated. The gradually varying diameter of the finger-like voids led to a loading direction dependent fracture strength. Meanwhile, no strength degradation was found when penetration depths of these macro-voids increased from 70% to 80% of the membrane thickness, because the void tails caused no interference to the bending stress. The sponge-like structure surrounding the finger-like voids absorbed strains, and the resultant stress concentration determined the fracture strength.

Void (composites)

Macro

Macroscopic scale

10.2139/ssrn.4041308

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Extending interfacial toughness and thermal cycling lifetime of thermal barrier coatings via interfacial 3D pattern

Journal of the American Ceramic Society (2024)

Lirong Luo Ting Yang Xiancheng Zhang Jie Lu Fangwei Guo

Abstract Weak interface bonding is a critical factor that compromises the long‐term durability of the thermal barrier coatings. To mitigate this, we introduce an innovative interface‐strengthening approach by integrating four types of 3D patterns at the top coat/bond coat interface using the laser cladding technique. Tensile tests demonstrate a significant enhancement in interfacial bonding strength, increasing by over 139.2% from 21.6 ± 1.7 MPa for conventional thermal barrier coatings without patterns to 51.67 MPa for the patterned coatings. Moreover, the thermal cycling lifetime has been extended by 41%, from 1026 ± 25 cycles for the conventional coating to 1936 ± 164 cycles for the patterned coating. This enhancement in interfacial toughness and thermal cycling lifetime is primarily because of the blocking and deflection effects of 3D patterns on interfacial crack propagation. Besides, the geometric parameters of the patterns play a crucial role in determining the failure behavior of the thermal barrier coatings. This strategy presents a practical solution for the development of durable thermal barrier coatings and provides the valuable insights for the optimization of other heterogeneous interfaces.

Temperature cycling

Cladding (metalworking)

10.1111/jace.20254

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