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Journal of Materials Science & Technology 2024年第20期187卷 86-100页

作者： Hao Tang Xiaoying Xi chaofeng gao Zhongqiang Liu Jiantao Zhang Weiwen Zhang Zhiyu Xiao Jeremy Heng Rao National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510641China Institute of Advanced Additive Manufacturing Ji Hua LaboratoryFoshan 528000China Well Technology Company Limited Foshan 528225China

In this work,a high-strength crack-free TiN/Al-Mn-Mg-Sc-Zr composite was fabricated by laser powder bed fusion(L-PBF).A large amount of uniformly distributed L1_(2)-Al_(3)(Ti,Sc,Zr)nanoparticles were formed during the L-PBF process due to the partial melting and decomposition of TiN nanoparticles under a high *** L1_(2)-Al_(3)(Ti,Sc,Zr)nanoparticles exhibited a highly coherent lattice relationship with the Al *** the prepared TiN/Al-Mn-Mg-Sc-Zr composite samples exhibit ultrafine grain *** addition,the as-built composite containing 1.5 wt%TiN shows an excellent tensile prop-erty with a yield strength of over 580 MPa and an elongation of over 8%,which were much higher than those of wrought 7xxx *** effects of various strengthening mechanisms were quantitatively estimated and the high strength of the alloy was mainly attributed to the refined microstructure,solid solution strengthening,and precipitation strengthening contributed by L1_(2)-Al_(3)(Ti,Sc,Zr)nanoparticles.

关键词： Laser powder bed fusion Aluminum matrix composites Heterogeneous nucleation Strengthening mechanisms Mechanical performance

Effects of direct aging treatment on microstructure,mechanical properties and residual stress of selective laser melted AlSi10Mg alloy

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Journal of Materials Science & Technology 2023年第8期139卷 198-209页

作者： Huaping Tang chaofeng gao Yong Zhang Nannan Zhang Chuan Lei Yunjie Bi Ping Tang Jeremy Heng Rao Institute of Advanced Additive Manufacturing Ji Hua LaboratoryFoshan 528200China Department of Materials Science and Engineering Monash UniversityClaytonVIC 3800Australia National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Hunan Farsoon High-Tech Co. LtdChangsha 410000China

Direct aging treatment is an important post-processing procedure,yet little research has been done on how it balances the mechanical properties and the stress removal for selective laser melted(SLMed)AlSi10Mg ***,we proposed a typical direct aging treatment on SLMed AlSi10Mg alloys,and studied the effects on their microstructure,properties and residual stress *** results indi-cate that the as-built microstructure is mainly composed of fine cellularα-Al and reticulated Si phases,and some pre-existing precipitates and dislocations are found in these *** direct aging treatment promotes the precipitation of nano-scaled Si phases and preserves a network-like Si ***,the strength of the peak-aged alloy increases while the ductility *** the aging temperature in-creases from 160 to 200℃,aging hardening behavior was accelerated *** at 160℃ for 4-9 h removes 32.0%-43.0%of the residual stress,which is attributed to the decomposition of the su-persaturatedα-Al matrix,the precipitation of the nano-Si phase and the exposure of low-angle grain boundaries(LAGBs).Considering the overal alloy performance obtained,over-aging at 160℃ for 4 h is the optimized heat treatment *** this condition,the yield strength(YS),ultimate tensile strength(UTS)and elongation(EL)of the alloy in the transverse and longitudinal direction are 309.5 MPa,464.4 MPa and 8.3%and 286.4 MPa,464.9 MPa and 5.1%,respectively.

关键词： Selective laser melting AlSi10Mg alloys Direct aging treatment Residual stress removal

The exploration of the innovation mode of school enterprise cooperation in game analysis

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International English Education Research 2015年第12期 12-14页

作者： gao chaofeng YANG Ting DUAN Longlong School of management shanghai university of engineer and science shanghai 201620 China

school enterprise cooperation as a new mode of teaching. In the teaching practice has its advantages and disadvantages, how to obtain the maximum value in the pros and cons,It is the problems that enterprises and schools, both sides need to work together to solve. This article will carries on the domestic and foreign cooperation game research production analysis on the advantages and disadvantages in school enterprise cooperation and the analysis of its innovation. Emphasizing that between school and enterprises signed employment agreement, both parties together to develop personnel training plan, and the teachers, technology and other aspects to carry on the cooperation, using ＂agreement order type＂ talent culture.

关键词： University - Industry Cooperation Game analysis Collaborative Innovation Agreement order type

Multivariate relationships between microstructure evolution and strengthening mechanisms in laser powder bed fusion of Al-Mn-Sc alloy:towards improved fatigue performance

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Light(Advanced Manufacturing) 2024年第1期5卷 3-18页

作者： Huaping Tang chaofeng gao Shiheng Zhang Xiaojing Xiong Sheng Cao Xiaopeng Wu Yunjie Bi Jeremy Heng Rao Institute of Advanced Additive Manufacturing Ji Hua LaboratoryFoshanGuangdong528200China Department of Mechanical Engineering College of EngineeringShantou UniversityShantouGuangdong515063China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

The effects of direct aging treatment(at 300℃ for 5 hours)on selective laser melted(SLMed)Al-4.5Mn-1.5Mg-0.9Sc-0.2Zr alloy were investigated in this work,with the microstructure,fatigue behaviors,and fracture characteristics examined to determine the primary cause of fatigue crack *** results revealed that the microstructure of the investigated alloy comprised fine equiaxed and columnar *** aging treatment,a significant number of nano-scaled Al3(Sc,Zr)precipitates were dispersed within the grains,leading to a substantial increase in *** yield strength improved from 431 MPa to 568 MPa,representing an increase of more than 32%,while the fatigue strength improved from 180 MPa to 220 MPa after aging ***,the fracture toughness decreased significantly from 25.1 MPa·√m to 12.3 MPa·√*** results of the fatigue fracture characteristics indicate that the Mn-rich phase and the formation of defects such as pores and poor powder fusion are the sources of fatigue *** direct aging treatment can significantly increase the yield strength,decrease the rate of fatigue crack propagation,and thus improve the fatigue performance,it deteriorates the fracture toughness,and thus shortens the fatigue life of the alloy as well.

关键词： Selective laser melting Al-Mn-Sc alloys High-cycle fatigue

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叶片曲面微结构加工刀位轨迹规划

北京交通大学学报 2019年第6期43卷 111-117页

作者：蔡永林高超峰北京交通大学机械与电子控制工程学院

针对基于单齿刀具的叶片曲面微结构加工效率不高的问题,以小叶轮为例对叶片曲面微结构加工进行了深入研究.先根据待加工叶片曲面的曲率信息,设计一种高效的微结构侧铣加工专用刀具——多齿鼓形刀;然后以叶轮叶片曲面五轴数控加工为背景... 详细信息

针对基于单齿刀具的叶片曲面微结构加工效率不高的问题,以小叶轮为例对叶片曲面微结构加工进行了深入研究.先根据待加工叶片曲面的曲率信息,设计一种高效的微结构侧铣加工专用刀具——多齿鼓形刀;然后以叶轮叶片曲面五轴数控加工为背景,利用多齿鼓形刀对叶片曲面微结构的加工进行刀位轨迹规划,使加工出的微结构分布均匀;最后以计算实例验证提出方法的有效性,并计算其刀位轨迹长度和加工仿真的时间,与单齿刀具进行比较.结果证明:采用多齿鼓形刀所生成的刀位轨迹长度和加工仿真时间都约为单齿刀具的1/3,加工效率得到了明显的提高,约为单齿刀具的3倍.

关键词：叶轮加工刀轨规划叶片曲面多齿鼓形刀微结构加工

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岸桥并行作业效率约束下泊位与岸桥集成分派

重庆交通大学学报（自然科学版） 2014年第3期33卷 72-78页

作者：高超锋胡志华上海海事大学物流研究中心上海201306 同济大学经济与管理学院上海200092

针对多个岸桥并行作业时的相互干扰而影响岸桥工作效率的问题,研究了岸桥并行作业效率约束下船舶作业泊位分派和岸桥分配优化的方法。建立了以船舶在港惩罚成本最小为目标的混合整数线性规划模型,引入不同作业环境下的干扰因子和偏离最... 详细信息

针对多个岸桥并行作业时的相互干扰而影响岸桥工作效率的问题,研究了岸桥并行作业效率约束下船舶作业泊位分派和岸桥分配优化的方法。建立了以船舶在港惩罚成本最小为目标的混合整数线性规划模型,引入不同作业环境下的干扰因子和偏离最佳靠泊泊位的惩罚系数,分析了岸桥工时和惩罚成本的影响。研究了并行作业岸桥数量变化对效率的影响。算例分析表明:虽然岸桥并行作业的数量增多能够加快装卸,减少船在港惩罚成本,但是会降低岸桥工作效率,增加岸桥总工时,从而增加集装箱港口的运作成本。

关键词：港口工程泊位与岸桥的集成分配并行作业干扰混合整数规划多目标优化

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枢纽成本约束下的零担物流轴辐式网络设计

计算机应用 2014年第10期34卷 3034-3038页

作者：高超锋肖玲胡志华上海海事大学物流研究中心上海201306 同济大学经济与管理学院上海200092

针对考虑枢纽建造成本和货物流的不确定的枢纽新建方案问题,引入全寿命周期理论,建立以轴辐式运营网络总成本最小化为目标的混合整数线性规划模型,并提出改进的最大最小后悔值的不确定性决策方法。通过算例来分析投资年限、枢纽干线折... 详细信息

针对考虑枢纽建造成本和货物流的不确定的枢纽新建方案问题,引入全寿命周期理论,建立以轴辐式运营网络总成本最小化为目标的混合整数线性规划模型,并提出改进的最大最小后悔值的不确定性决策方法。通过算例来分析投资年限、枢纽干线折扣系数和不确定枢纽建造成本对零担物流(LTL)轴辐式网络的设计的影响。实验结果表明,采用改进的不确定性决策方法得到的最优方案的运营成本比5个场景的运营成本平均降低了2.17%,表明基于改进的最大最小后悔值的不确定性决策方法,能够降低整个零担物流轴辐式运营网络总成本。

关键词：零担物流网络枢纽成本全寿命周期成本不确定性决策混合整数线性规划

Layer dependence of stacking order in nonencapsulated few-layer CrI3

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Science China Materials 2020年第3期63卷 413-420页

作者： Kai Guo Bowen Deng Zhen Liu chaofeng gao Zhongtai Shi Lei Bi Li Zhang Haipeng Lu Peiheng Zhou Linbo Zhang Yingchun Cheng Bo Peng National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory of Flexible Electronics&Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 211816China Department of Physics Broida HallUniversity of California Santa BarbaraCA 93106-9530USA Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of ChinaChengdu 611731China

Long-range magnetic orders in atomically thin ferromagnetic CrI3 trigger new fascinating physics and application *** physical properties of two-dimensional(2D)ferromagnetism CrI3 are significantly influenced by interlayer spacing and stacking order,which are sensitive to the hydrostatic pressure and external ***,there remains debate on the stacking order at low ***,we study the interlayer coupling and stacking order of non-encapsulated 2–5 layer and bulk CrI3 at 10 K by Raman spectroscopy;demonstrate a rhombohedral stacking in both antiferromagnetic and ferromagnetic *** opposite helicity dependence of Ag and Eg modes arising from phonon symmetry further validates the rhombohedral *** anomalous temperature-dependent behavior is observed due to spin-phonon coupling below 60 *** study provides insights into the interlayer coupling and stacking orders of 2D ferromagnetic materials.

关键词： ferromagnetic 2D materials Ising ferromagnet spintronics magneto-optical

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考虑船舶油耗的集装箱班轮航线配船方案

华中师范大学学报（自然科学版） 2014年第6期48卷 840-846页

作者：高超锋肖玲胡志华上海海事大学物流研究中心上海201306 同济大学经济与管理学院上海200092

班轮航线配船主要是解决多船型在多条航线上的合理配置问题,目的在于充分利用船队资源.首先,分析航行速度对船舶油耗产生的影响,然后,根据班轮多港口挂靠和集装箱转运的特点,建立以周计划内船队运营总成本最小为目标的混合整数规划模型... 详细信息

班轮航线配船主要是解决多船型在多条航线上的合理配置问题,目的在于充分利用船队资源.首先,分析航行速度对船舶油耗产生的影响,然后,根据班轮多港口挂靠和集装箱转运的特点,建立以周计划内船队运营总成本最小为目标的混合整数规划模型.算例中通过对航行速度的灵敏性分析,呈现了船舶油耗和船队运营总成本之间的二律背反规律.随着船舶加速,虽然船队运营总成本递减,但是集装箱的转运成本和港口靠泊作业成本却呈现增加的趋势.其次,运用了轴辐式网络的特点,能够从46个港口中选择一半数量的中转港进行集中转运操作,具有规模经济优势.

关键词：航线配船船舶油耗集装箱转运混合整数规划多目标优化

Bulging Performance and Quality Control of Aluminum Alloy Tailor-welded Overlapping Sheets Based on Interface Friction

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 258-264页

作者： gao Tiejun gao Bowen LI Weijie ZHANG Jiabin College of Aerospace Engineering Shenyang Aerospace UniversityShenyang 110136China Shenyang Aerospace Xinguang Group Co.L td. Shenyang 110043China

In order to solve the problem of poor formability caused by different materials and properties in the process of tailor-welded sheets forming,a forming method was proposed to change the stress state of tailor-welded sheets by covering the tailor-welded sheets with better plastic properties overlapping *** the same time,the interface friction effect between the overlapping and tailor-welded sheets was utilized to control the stress magnitude and further improve the formability and quality of the tailor-welded *** this work,the bulging process of the tailor-welded overlapping sheets was taken as the research *** alloy tailor-welded overlapping sheets bulging specimens were studied by a combination of finite element analysis and experimental *** results show that the appropriate use of interface friction between tailor-welded and overlapping sheets can improve the formability of tailor-welded sheets and control the flow of weld seam to improve the forming *** increasing the interface friction coefficient on the side of tailor-welded sheets with higher strength and decreasing that on the side of tailor-welded sheets with lower strength,the deformation of the tailor-welded sheets are more uniform,the offset of the weld seam is minimal,the limit bulging height is maximal,and the forming quality is optimal.

关键词： tailor-welded sheets overlapping sheet bulging interface friction weld seam stress