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Science China(Technological Sciences) 2021年第9期64卷 1920-1926页

作者： LI ChunHui WANG MingLiang ZHANG HuanZhi ZHANG GuoJia LI TianXin lu yiping LI TingJu Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China

A novel Al_(0.5)V_(0.1)FeCrMnNi_(0.9) high-entropy alloy was designed to achieve enhanced strength and plasticity. The as-cast Al_(0.5)V_(0.1)FeCrMnNi_(0.9) alloy shows a typical dendritic microstructure consisting of a body-centered cubic-structured matrix phase and a B2-structured nanoprecipitate phase. Nanoprecipitates are homogeneous and dispersed in the matrix. The as-cast Al_(0.5)V_(0.1)FeCrMnNi_(0.9) alloy exhibits a compressive yield strength of 1.104 GPa, a fracture strength of 2.926 GPa, and a fracture strain of 45.7%. The product of strength and plasticity of this alloy is 133.72 GPa%, which is superior to that of most of the reported high-entropy alloys. The strengthening mechanisms were evaluated in detail, which indicates that the coherent precipitation enhancement contributes to the unusually high strength and plasticity.

关键词： high-entropy alloy microstructure mechanical properties precipitation strengthening

The interaction and migration of deformation twin in an eutectic high-entropy alloy AlCoCrFeNi2.1

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Journal of Materials Science & Technology 2019年第5期35卷 902-906页

作者： Yaoli Zhang Jinguo Li Xinguang Wang yiping lu Yizhou Zhou Xiaofeng Sun Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China Key Laboratory of Space Manufacturing Technology Chinese Academy of Sciences Beijing 100094 China School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

An eutectic high-entropy alloy consisting Al, Co, Cr, Fe and Ni elements was prepared by vacuum directional solidification technology. The alloy exhibits excellent comprehensive mechanical performance during tension at temperature range of 600–700℃. The microstructure reveals the intersection of twintwin is the prevailing deformation mechanism and the twins play a dual role in strengthening and toughening the alloy in the thermomechanical process. The deformation twin variants I and were formed by the edge dislocation 112 and the mixed dislocation 211 on the {111} crystal planes, respectively. Besides, the dislocation jogs and kinks caused by twin intersection on the slip planes can strengthen the alloy, which may contribute to the high strength(the tensile strengths at the 600°and 700°tensile tests are respectively780 MPa and 630 MPa.). Moreover, the coherent twin boundary migration has the function of coordinating deformation and contributes to the high ductility of the alloy.

关键词： Eutectic high-entropy alloy Tensile properties Deformation twin Dislocation jog Twin migration

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纤维基创面敷料的研究进展

纺织工程学报 2024年第3期2卷 74-84页

作者：张四维周丽洁鲁一平鲁振坦武汉纺织大学纺织纤维及制品教育部重点实验室武汉430200 振德医疗卫生用品股份有限公司浙江绍兴312000

随着人们对医疗需求的增长及各种生物活性材料的出现,创面敷料已由传统仅能被动包覆创面走向多样化及功能化。针对纤维基创面敷料,系统地总结了天然/人工纤维为原料的创面敷料研究现况,成型方式对纤维基创面敷料性能的影响。最后对纤维... 详细信息

随着人们对医疗需求的增长及各种生物活性材料的出现,创面敷料已由传统仅能被动包覆创面走向多样化及功能化。针对纤维基创面敷料,系统地总结了天然/人工纤维为原料的创面敷料研究现况,成型方式对纤维基创面敷料性能的影响。最后对纤维基创面敷料的功能化进行了总结并介绍了现有市售纤维基创面敷料的主要应用场景及不足,为纤维基创面敷料的后续发展提供了参考。

关键词：原料成型方式功能化纤维基创面敷料

维普期刊数据库博看期刊

Origin of strong solid solution strengthening in the CrCoNi-W medium entropy alloy

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Journal of Materials Science & Technology 2021年第14期73卷 101-107页

作者： Yujie Chen Yan Fang Xiaoqian Fu yiping lu Sijing Chen Hongbin Bei Qian Yu Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute for Superalloy Science and Technology School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China

Solid solution strengthening is one of the most conventional strategies for optimizing alloys strength,while the corresponding mechanisms can be more complicated than we traditionally thought specifically as heterogeneity of microstructure is *** this work,by comparing the change of chemical distribution,dislocation behaviors and mechanical properties after doping equivalent amount of tungsten(W)atoms in CrCoNi alloy and pure Ni,respectively,it is found that the alloying element W in CrCoNi alloy resulted in much stronger strengthening effect due to the significant increase of heterogeneity in chemical distribution after doping trace amount of *** large atomic scale concentration fluctuation of all elements in CrCoNi-3W causes dislocation motion via strong nanoscale segment detrapping and severe dislocation pile up which is not the case in *** results revealed the high sensitivity of elements distribution in multi-principle element alloys to composition and the significant consequent influence in tuning the mechanical properties,giving insight for complex alloy design.

关键词： Medium entropy alloy Chemical distribution heterogeneity Alloying effect Solid solution strengthening mechanism In situ observation

Tensile deformation behavior and mechanical properties of a bulk cast Al0.9 CoFeNi2 eutectic high-entropy alloy

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Journal of Materials Science & Technology 2021年第2期61卷 119-124页

作者： Hui Jiang Dongxu Qiao Wenna Jiao Kaiming Han yiping lu Peter K.Liaw College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Stare Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China Department of Materials Science and Engineering the University of TennesseeKnoxvilleTN37996USA

In this study,a new Al0.9CoFeNi2 eutectic high entropy alloy(EHEA) was designed,and the microstructures as well as the deformation behavior were *** bulk cast Al0.9CoFeNi2 EHEA exhibited an order face-centered cubic FCC(L12) and an order body-centered cubic(B2) dual-phase lamellar eutectic *** volume fractions of FCC(L12) and B2 phases are measured to be 60 % and 40 %,*** combination of the soft and ductile FCC(L12) phase together with the hard B2 phase resulted in superior strength of 1005 MPa and ductility as high as 6.2 % in tension at room *** Al0.9CoFeNi2 EHEA exhibited obvious three-stage work hardening characteristics and high workhardening *** evolving dislocation substructure s during uniaxial tensile deformation found that planar slip dominates in both FCC(L12) and B2 phases,and the FCC(L12) phase is easier to deform than the B2 *** post-deformation transmission electron microscopy revealed that the sub-structural evolution of the FCC(L12) phase is from planar dislocations to bending dislocations,high-density dislocations,dislocation network,and then to dislocation walls,and Taylor lattices,while the sub-structural evolution of the B2 phase is from a very small number of short dislocations to a number of planar ***,obvious ductile fracture in the FCC(L12) phase and a brittle-like fracture in the B2 phase were observed on the fracture surface of the Al0.9CoFeNi2 *** re search results provide some insight into the microstructure-property relationship.

关键词： Eutectic high-entropy alloy Microstructure Mechanical properties Deformation behavior

Effect of Niobium on Microstructure and Properties of the CoCrFeNb_xNi High Entropy Alloys

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Journal of Materials Science & Technology 2017年第7期33卷 712-717页

作者： Hui Jiang Li Jiang Dongxu Qiao yiping lu Tongmin Wang Zhiqiang Cao Tingju Li Key Laboratory of Solidification Control and Digital Preparation Technology （Liaoning Province） School of Materials Science and Engineering Dalian University of Technology Dalian 116024. China

A series of CoCrFeNb_xNi（x values in molar ratio, x = 0, 0.25, 0.45, 0.5, 0.75, 1.0 and 1.2） high entropy alloys（HEAs） was prepared to investigate the alloying effect of Nb on the microstructures and mechanical properties. The results indicate that the prepared CoCrFeNb_xNi（x 〉 0） HEAs consist of a simple FCC solid solution phase and a Laves phase. The microstructures of the alloys change from an initial single-phase FCC solid solution structure（x = 0） to a hypoeutectic microstructure（x = 0.25）, then to a full eutectic microstructure（x = 0.45） and finally to a hypereutectic microstructure（0.5 〈 x 〈 1.2）. The compressive test results show that the Nb0.45（x = 0.45） alloy with a full eutectic microstructure possesses the highest compressive fracture strength of 2558 MPa and a fracture strain of 27.9%. The CoCrFeNi alloy exhibits an excellent compressive ductility, which can reach 50% height reduction without fracture. The Nb0.25 alloy with a hypoeutectic structure exhibits a larger plastic strain of 34.8%. With the increase of Nb content, increased hard/brittle Laves phase leads to a decrease of the plasticity and increases of the Vickers hardness and the wear resistance. The wear mass loss, width and depth of wear scar of the Nb1.2（x = 1.2） alloy with a hypereutectic structure are the lowest among all alloy systems, indicating that the wear resistance of the Nb1.2 alloy is the best one.

关键词： Alloy design Microstructure Mechanical properties Wear resistance

Thermal modification of brittle CoFeNi_(2)(Ti_(3)Si_(5))_(0.16) eutectic high-entropy alloy by annealing treatment

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Science China(Technological Sciences) 2023年第4期66卷 966-975页

作者： ZHANG LingKun WANG MingLiang HUANG Rui CHEN XiaoHu REN Zheng HE Tao lu yiping Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Branch of Chinese Academy of Ordnance Science Ningbo 315103China Wuhan Second Ship Design and Research Institute Wuhan 430205China

Adopting the idea of thermal modification of conventional Si-containing eutectic alloys,this study performed heating of the brittle CoFeNi_(2)(Ti_(3)Si_(5))_(0.16) eutectic high-entropy alloy under various annealing conditions to attempt the fragmentation and spheroidization of eutectic microstructure and improve fracture *** reveal that the as-cast alloy exhibited fine eutectic microstructures with lamellar+network morphologies,consisting of face-centered cubic(FCC)and M_(16)Ti_(6)Si_(7)-type *** annealing at 1100℃×120 h,the lamellar+network eutectic morphologies were effectively fragmented and spheroidized into granular+irregular *** resulting alloy featured excellent mechanical properties with an ultimate compressive strength(UCS)of 1980±50 MPa,fracture plasticity of~16.6%±1%,and hardness of~448±15 *** with the as-cast specimen,the fracture plasticity of the specimen annealed for 120 h increased by 12.7 times,with no UCS *** a further increase in the annealing time,the hard M_(16)Ti_(6)Si_(7)-type silicide was seriously coarsened,deteriorating the alloy’s room-temperature mechanical properties but improving its high-temperature ones.

关键词： eutectic high-entropy alloy mechanical properties thermal modification annealing

Entropy as a selection rule for crystal growth in undercooled binary eutectic melts

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Chinese Science Bulletin 2009年第6期54卷 1012-1018页

作者： lu yiping XI ZengZhe YANG GenCang LIN Xin ZHOU YaoHe State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China School of Materials and Chemical Engineering Xi'an Technological University Xi'an 710032 China

A solution entropy model was developed for the undercooled binary eutectic alloy systems. As an ex-tension of Taylor and Fidler et al.'s model, the present model considered the change of phase compo-sition with the increase of undercooling. Furthermore, the sub-regular solution model and the interac-tion parameter (IAB) were also introduced. In this paper, the extended model is used to calculate the solution entropy for binary eutectic phases under the undercooled condition, and the application scope of the model is also extended. Not only the growth manner of eutectic phases, but also the transition of morphologies may be predicted and explained by calculating the solution entropy of eutectic phases under the non-equilibrium condition with the developed model. Experimental results show that the developed model is valid for the undercooled Ni-Si and Ni-Sn eutectic alloy systems.

关键词：熵模型共晶相二元晶体生长选择规则熔体相互作用参数正规溶液模型

Effect of ultrasonic treatment and Sr addition on microstructure of Al-20%Si alloy

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China Foundry 2013年第4期10卷 213-216页

作者： Miao Long lu yiping Zhang Yubo Fu Ying Li Tingju School of Materials Science EngineeringDalian University of Technology

Many investigations have revealed that transition of melt structure can effectively influence the final solidification microstructures. In this study, ultrasonic treatment was applied to AI-20%Si melt and Sr-modified AI-20%Si melt at 720 ℃ （i.e. above liquidus of about 690℃） for 60 s, and then the melt was quickly quenched to room temperature. Experimental results show that ultrasonic treatment can refine the primary Si phase and a-AI of AI-20%Si alloy; strontium can make the morphology of Si phase spheroidized and refined as Sr addition changes the faceted growth characteristic of Si phase; however, the refinement effect of ultrasonic treatment on the primary Si phase and α-AI is weakened by Sr addition.

关键词： ultrasonic treatment nucleation rate liquidus strontium modification quenching

局部进展期直肠癌新辅助治疗后行ISR术远切缘距离的临床研究

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中华普外科手术学杂志（电子版） 2024年第5期18卷 539-543页

作者：高建新王啸飞于淼路夷平首都医科大学附属北京中医医院肿瘤外科北京100010

目的:研究局部进展期直肠癌(LARC)新辅助治疗后行不同远切缘腹腔镜经括约肌间切除术(ISR)的临床效果,分析手术远切缘距离对不同病理TNM分期(ypTNM)患者预后的影响。方法:回顾性分析2019年1月至2021年12月86例接受新辅助治疗的LARC患者... 详细信息

目的:研究局部进展期直肠癌(LARC)新辅助治疗后行不同远切缘腹腔镜经括约肌间切除术(ISR)的临床效果,分析手术远切缘距离对不同病理TNM分期(ypTNM)患者预后的影响。方法:回顾性分析2019年1月至2021年12月86例接受新辅助治疗的LARC患者临床资料,所有患者经新辅助治疗后均行腹腔镜ISR手术。根据术中远切缘距离分为远切缘0.05);远切缘≥1?cm组患者术后局部复发率及累积DFS生存优于0.05);ypT_(3)期远切缘<1?cm的患者DFS生存低于≥1?cm的患者(P<0.05)。结论:局部进展期直肠癌新辅助治疗后ISR手术远切缘距离的选择不影响围手术期效果、并发症的发生、术后肛门功能恢复及生活质量;手术远切缘距离<1?cm与术后局部复发和DFS生存相关,尤对ypT_(3)期患者的影响较为显著。

关键词：直肠肿瘤新辅助治疗经括约肌间切除术切缘肿瘤复发局部