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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 147-153页

作者： Junjie Li wenbo yu Zhenyu Sun Weichen Zheng Liangwei Zhang Yanling Xue Wenning Liu Shoumei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Traffic&Transportation Engineering Central South UniversityChangsha 410075China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

High pressure die casting(HPDC)AlSi10Mn Mg alloy castings are widely used in the automobile *** can optimize the mechanical properties of castings through heat treatment,while the release of thermal stress arouses the deformation of large integrated ***,the development of non-heat treatment Al alloys is becoming the hot *** addition,HPDC contains externally solidified crystals(ESCs),which are detrimental to the mechanical properties of *** achieve high strength and toughness of non-heat treatment die-casting Al-Si alloy,we used AlSi9Mn alloy as matrix with the introduction of Zr,Ti,Nb,and *** influences on ESCs and mechanical properties were systematically investigated through three-dimensional reconstruction and thermodynamic *** results reveal that the addition of Ti increased ESCs'size and porosity,while the introduction of Nb refined ESCs and decreased ***,large-sized Al_3(Zr,Ti)phases formed and degraded the mechanical *** introduction of Ce resulted in the poisoning effect and reduced mechanical properties.

关键词： aluminium alloy high-pressure die-casting externally solidified crystals non-heat treatment

Study of Mg-Al-Ca magnesium alloy ameliorated with designed Al8Mr4Gd phase

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Journal of Magnesium and Alloys 2020年第4期8卷 1084-1089页

作者： Chaosheng Ma wenbo yu Xufeng Pi Antoine Guitton School of Mechanical and Electronic Control Engineering Beijing JiaoTong UniversityBeijingChina Universite de Lorraine-CNRS-Arts et Metiers ParisTech-LEM3 F-57000 MetzFrance Laboratory of Excellence on Design of Alloy Metals for low-niAss Structures(DAMAS) Universite de LorraineF-57073 MetzFrance

To investigate the effect of AlsMn4Gd phase on microstructural and mechanical properties of Mg-Al-Ca magnesium alloy,two Mg-2.5AbCa and Mg-2.5Al2Ca-0.1 Al8Mn4Gd alloys were designed and compared in this *** results show that a small amount of Gd can significantly refine a-Mg grains and change the morphology of AUCa ***,the formed Al8Mn4Gd phase could serve as a heterogeneous nucleation site for the a-Mg grains and AbCa ***,the introduction of Gd not only optimized the mechanical properties of Mg-Al-Ca alloy,but also facilitated the thermal deformation(such as hot rolling).

关键词： Mg-Al-Ca alloy AlgNlruGd phase Microstructure and mechanical properties Hot rolling.

Effects of runner design and pressurization on the microstructure of a high-pressure die cast Mg-3.0Nd-0.3Zn-0.6Zr alloy

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International Journal of Minerals,Metallurgy and Materials 2022年第7期29卷 1310-1316页

作者： Tongtong Zhang wenbo yu Chaosheng Ma yuqi Zhou Shoumei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

To clarify the relationship between externally solidified crystals(ESCs)and other defects,e.g.,defect bands and pores,two dimensional(2D)and three dimensional(3D)characterization methods were adopted to analyze castings produced using a modified ingate system equipped with and without an ESC *** reduction of ESCs strongly reduced defect band width and shrinkage pore *** reducing the quantity and size of ESCs,net-shrinkage pores were transformed into isolated island-shrinkage *** determined via statistical analysis that the mechanical properties of high pressure die castings were strongly related to the size and fraction of the ESCs rather than porosity *** reduction of ESCs also caused tensile transgranular fracture modes to transform into intergranular fracture ***,casting pressurization strongly reduced pore morphology,volume,and size.

关键词： high-pressure die casting externally solidified crystals porosity 3D reconstruction runner design

Determination of Interfacial Heat Transfer Behavior at the Metal/Shot Sleeve of High Pressure Die Casting Process of AZ91D Alloy

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Journal of Materials Science & Technology 2017年第1期33卷 52-58页

作者： wenbo yu Yongyou Cao Xiaobo Li Zhipeng Guo Shoumei Xiong School of Materials Science and Engineering Tsinghua University Beijing 100084 China Laboratory for Advanced Materials Processing Technology Ministry of Education. Tsinghua University Beijing 100084 China

The interfacial heat transfer behavior at the metalJshot sleeve interface in the high pressure die casting （HPDC） process of AZ91D alloy is carefully investigated. Based on the temperature measurements along the shot sleeve, inverse method has been developed to determine the interfacial heat transfer coefficient in the shot sleeve. Under static condition, Interracial heat transfer coefficient （IHTC） peak values are 11.9, 7,3, 8.33kWm-2K-1 at pouring zone （S2）, middle zone （S5）, and end zone （510）, respectively. During the casting process, the IHTC curve displays a second peak of 6.1 kWm-2 K-1 at middle zone during the casting process at a slow speed of 0.3 ms 1 Subsequently, when the high speed started, the IHTC curve reached a second peal〈 of 12.9 kW m-2K-1 at end zone. Furthermore, under different slow casting speeds, both the calculated initial temperature （TIDs） and the maximum temperature （Tsimax） of shot sleeve surface first decrease from 0.1 ms-1 to 0.3 ms-1, but increase again from 0.3 ms-1 to 0.6 ms-1. This result agrees with the experimental results obtained in a series of ＂plate-shape＂ casting experiments under different slow speeds, which reveals that the amount of ESCs decreases to the minimum values at 0.3 m s-1 and increase again with the increasing casting slow speed.

关键词： High pressure die casting (HPDC) Interracial heat transfer behavior Inverse method Slow casting speed

Self-lubricate and anisotropic wear behavior of AZ91D magnesium alloy reinforced with ternary Ti_2AlC MAX phases

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Journal of Materials Science & Technology 2019年第3期35卷 275-284页

作者： wenbo yu Deqiang Chen Liang Tian Hongbin Zhao Xiaojun Wang Center of Materials Science and Engineering School of Mechanical and Electronic Control Engineering Beijing Jiaotong University National United Engineering Laboratory for Advanced Bearing Tribology Henan University of Science and Technology Department of Materials Science and Engineering University of Michigan State Key Laboratory of Advanced Materials for Smart Sensing General Research Institute for Nonferrous Metals School of Materials Science and Engineering Harbin Institute of Technology

The dry sliding wear behavior of Ti_2AlC reinforced AZ91 magnesium composites was investigated at sliding velocity of 0.5 m/s under loads of 10, 20, 40 and 80 N using pin-on-disk configuration against a Cr15 steel disc. Wear rates and friction coefficients were registered during wear tests. Worn tracks and wear debris were examined by scanning electron microscopy, energy dispersive X-ray spectrometry and transmission electron microscopy in order to obtain the wear mechanisms of the studied materials. The main mechanisms were characterized as the magnesium matrix oxidation and self-lubrication of Ti_2AlC MAX phase. In all conditions, the composites exhibit superior wear resistance and self-lubricated ability than the AZ91 Mg alloy. In addition, the anisotropic mechanisms in tribological properties of textured Ti_2AlC-Mg composites were confirmed and discussed.

关键词： Ti2AlC Dry sliding wear Magnesium alloy Self-lubricate ability

Mutual Information and Clone Selection Algorithm Based Hyperspectral Band Selection Method 36

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Mutual Information and Clone Selection Algorithm Based Hyper...

The effect of slow shot speed and casting pressure on the 3D microstructure of high pressure die casting AE44 magnesium alloy

第36届中国控制会议

作者： wenbo yu Miao Zhang Yi Shen Department of Control Science and Engineering Harbin Institute of Technology

ISBN: (纸本)9781538629185

The large number of spectral bands in hyperspectral data provides abundant information to distinguish different land forms,however,the high dimensionality of hyperspectral data brings an extra computational *** band selection is important for hyperspectral *** proposed hyperspectral clone selection algorithm based band selection method（CSABS） chooses an improved multi-dimensional mutual information method as the measure criterion,can select bands with richer information and lower redundancy from hyperspectral data and it is effective due to low reconstruction *** clone selection algorithm is proposed as the search strategy where the adaptive clone and mutation operators are devised to speed up the *** method not only take full advantage of multiple iterations of clone selection algorithm,but also has high *** results on hyperspectral data demonstrate the effectiveness of the proposed band selection method.

关键词： hyperspectral data band selection clone selection algorithm mutual information

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Journal of Magnesium and Alloys 2023年第2期11卷 753-761页

作者： Chaosheng Ma wenbo yu Tongtong Zhang Zihua Zhang Yihu Ma Shoumei Xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Research Center of Rail Vehicles Safety Monitoring and Health Management Beijing Jiaotong UniversityBeijing 100044China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

3D reconstruction and 2D observation were conducted to characterize the microstructure of the castings produced through high pressure die casting with different *** results indicate that shrinkage pores generally co-existed with externally solidiﬁed crystals(ESCs).In specimen produced without fast slow shot speed,big net-shrinkage pores accompanied with ESCs were found in the center of the *** the casting pressurization was introduced,the shrinkage pores gathered to the specimen center and became much less due to the optimization of melt *** more porosity was found near the gate rather than in the middle of the rod bar,especially gas ***ﬁlling process simulation reveals that the middle position of the bars wasﬁrstlyﬁlled and followed by the near gate position accompanied with one intense turbulentﬂow.

关键词： HPDC parameters Externally solidiﬁed crystals(ESCs) Porosity 3D reconstruction.

A review of novel ternary nano-layered MAX phases reinforced AZ91D magnesium composite

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Journal of Magnesium and Alloys 2022年第6期10卷 1457-1475页

作者： Wantong Chen wenbo yu Chaosheng Ma Guozheng Ma Laiqi Zhang Haidou Wang Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing100083China

In recent decades, the demand for lightweight and high specific strength materials brings about the development of magnesium matrix composites. Different from some traditional binary ceramic particles, such as SiC, Al_(2)O_(3), the novel ternary nano-layered M_(n+1)AX_(n)(MAX)phase carbide or nitride ceramics exhibit metal-like properties and self-lubricate capacity(where “M” is an early transition metal, “A” belongs to the group A element, “X” is C or/and N, and n = 1–3). Ti_(2)AlC, as the representative of the MAX phase, was interestingly introduced into the magnesium matrix. Layered Ti_(2)AlC MAX phased reinforced AZ91D magnesium composites manufactured through the stir casting exhibit sufficient deformation capacity due to unique deformation behaviors of MAX, namely delamination and the formation of kinking band. Further,the Ti_(2)AlC-AZ91D composites exhibit a distinctive characteristic in strengthening mechanism, damping mechanism and tribological capacity due to the other special properties of MAX phase, such as self-lubricated property. Accordingly, to give a comprehensive understanding, we overviewed the fabrication process, microstructural characterization, mechanical properties, damping property and tribological capacity on these composites. In order to understand the A-site effect in MAX phase on the microstructure, we introduced another representative Ti_(3)SiC_(2)MAX phase to explain the interfacial evolution. In addition, due to the high aspect ratio of MAX, MAX particles could be orientationally regulated in Mg matrix by plastic deformation such as hot extrusion. Herein, we discussed the anisotropic mechanical and physical properties of the textured composites produced by hot extrusion. Moreover, the potential applications and future development trends of MAX phases reinforced magnesium matrix composites were also given and prospected.

关键词： Ternary MAX phases Magnesium composite Damping Mechanical properties Anisotropic Tribological capacity

Self-healing behavior of Ti_(2)AlC at a low oxygen partial pressure

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Journal of Advanced Ceramics 2022年第11期11卷 1687-1695页

作者： Boxiang YAO Shibo LI Weiwei ZHANG wenbo yu Yang ZHOU Shukai FAN Guoping BEI Center of Materials Science and Engineering School of MechanicalElectronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China China Porcelain Fuchi(Suzhou)High Tech Nano Materials Co. Ltd.Suzhou 215100China

Ti_(2)AlC,a MAX phase ceramic,has an attractive self-healing ability to restore performance via the oxidation-induced crack healing mechanism upon healing at high temperatures in air(high oxygen partial pressures).However,such healing ability to repair damages in vacuum or low oxygen partial pressure conditions remains ***,we report on the self-healing behavior of Ti_(2)AlC at a low oxygen partial pressure of about 1 *** experimental results showed that the strength recovery depends on both healing temperature and *** healing at 1400℃for 1–4 h,the healed samples exhibited the recovered strengths even exceeding the original strength of 375 *** maximum recovered strength of~422 MPa was achieved in the healed Ti_(2)AlC sample after healing at 1400 for 4 h,about 13%higher than the original *** were healed by the formed℃TiCx from the decomposition of Ti_(2)*** decomposition-induced crack healing as a new mechanism in the low oxygen partial pressure condition was disclosed for the MAX *** present study illustrates that key components made of Ti_(2)AlC can prolong their service life and keep their reliability during use at high temperatures in low oxygen partial pressures.

关键词： MAX ceramics Ti_(2)AlC self-healing low oxygen partial pressures strength recovery mechanism

Mechanical properties and frictional resistance of Al composites reinforced with Ti3C2Tx MXene

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Chinese Chemical Letters 2020年第4期31卷 996-999页

作者： Jie Hu Shibo Li Jing Zhang Qiuying Chang wenbo yu Yang Zhou School of Mechanical and Electronic Control Engineering Beijing Jiaotong UniversityBeijing 100044China

Two-dimensional(2D)Ti3C2Tx MXene is an attractive additive not only used in base oil due to its low friction coefficient,but also used in composites due to its high aspect ratio and rich surface functional *** far there has been intense research into polymer matrix composites reinforced with Ti3C2Tx,Here we report on the use of 2D Ti3C2Tx to enhance the mechanical and frictional properties of Al matrix ***3C2Tx/Al composites were designed and prepared by pre s sureless sintering followed by hot extrusion *** prepared composites exhibit a homogeneous distribution of *** Vickers hardness and the tensile strength continuously increase with increasing Ti3C2Tx content.A hardness of 0.52 GPa and a tensile strength of 148 MPa were achieved in the 3 wt%Ti3C2Tx/Al *** frictional properties of pure Al and the Ti3C2Tx/Al composite were comparably studied under dry sliding.A low friction coefficient of 0.2,twice lower than that of pure Al,was achieved in the 3 wt%Ti3C2Tx/Al ***3C2Tx acting as a solid lubricant reduces the abrasive wear in the composite,improving the frictional properties of Al matrix composites.

关键词： Ti3C2Tx Mxene Al composites Microstructure Mechanical properties Frictional properties