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Excellent strength-ductility combination of Cr_(26)Mn_(20)Fe_(20)Co20Ni_(14) high-entropy alloy at cryogenic temperatures

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Journal of Materials Science & technology 2023年第23期154卷 166-177页

作者： Xuzhou Gao Wei Jiang Yiping Lu Zhigang Ding Jizi Liu Wei Liu Gang Sha tongming Wang tingju Li isaac t.h.chang Yonghao Zhao Nano and heterogeneous Materials Center School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing 210094 China Key Laboratory of Solidification Control and Digital Preparation technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology Nanjing 210094 China Metallurgy and head of Liquid Metal Engineering (LiME) Doctoral training Centre Brunel Centre for Advanced Solidification Technology (BCAST) Brunel University London Uxbridge UB8 3PH UK

In the present study,a face-centered cubic non-equiatomic Cr_(26)Mn_(20)Fe_(20)Co20Ni_(14) high-entropy alloy(hEA)with a low stacking fault energy of 17.6 mJ m^(−2) was prepared by vacuum induction melting,forging and annealing *** recrystallized sample is revealed to exhibit an excellent combination of strength and ductility over a wide temperature range of 4.2–293 *** decreasing temperature from 293 to 77 K,the ductility and ultimate tensile strength(UtS)gradually increase by 30% to 95% and 137% to 1020 MPa,*** the lowest temperature of 4.2 K,the ductility keeps 65% and the UtS increases by 200% to 1300 MPa,which exceed those published in the literature,including conventional 300 series stainless *** microstructural analyses of this alloy reveal a change of deformation mechanisms from dislocation slip and nano-twinning at 293 K to nano-phase transformation at 4.2 *** cooperation and competition of multiple nano-twinning and nano-phase transformation are responsible for the superior tensile properties at cryogenic *** study provides experimental evidence for potential cryogenic applications of hEAs.

关键词： high-entropy alloys Strength and ductility Cryogenic temperature twinning Phase transformation

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Fracture strength evaluation of titanium alloys using modified average stress criterion

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transactions of Nonferrous Metals Society of China 2013年第4期23卷 1072-1079页

作者： h.BRIGhtON isaac JOhN t.ChRIStOPhER Sardar Raja College of Engineering AlangulamTirunelveli-627808India Government College of Engineering PerumalpuramTirunelveli-627007India

Structural integrity procedures were used to demonstrate the fitness for the purpose of engineering components transmitting loads. the prediction of the fracture strength of titanium alloys containing sharp notches through the damage model depends on the un-notched strength and the critical length of the damage zone ahead of the notch. In general, the critical length of the damage zone depends on the material, specimen, and size of the sharp notch. Modifications were made in one of the stress fracture criteria known as the average stress criterion for accurate prediction of notched tensile strength of titanium alloy specimen containing sharp notches. to examine the adequacy of these modifications, fracture data of center-cracked titanium alloys with various thicknesses are considered. the notched （fracture） strength estimates are found to be close to the test results. the modified average stress criterion is very simple to predict the notched tensile strength.

关键词： titanium alloys center crack tensile specimen stress criterion failure assessment diagram fracture strength

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Complex regulatory effects of gut microbial short-chain fatty acids on immune tolerance and autoimmunity

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Cellular & Molecular Immunology 2023年第4期20卷 341-350页

作者： chang h.Kim Department of Pathology University of Michigan School of MedicineAnn ArborMI48109USA Mary h.Weiser Food Allergy Center Center for Gastrointestinal Researchand Rogel Center for Can

Immune tolerance deletes or suppresses autoreactive lymphocytes and is established at multiple levels during the development,activation and effector phases of t and B *** mechanisms are cell-intrinsically programmed and critical in preventing autoimmune *** have witnessed the existence of another type of immune tolerance mechanism that is shaped by lifestyle choices,such as diet,microbiome and microbial ***-chain fatty acids(SCFAs)are the most abundant microbial metabolites in the colonic lumen and are mainly produced by the microbial fermentation of prebiotics,such as dietary *** review focuses on the preventive and immunomodulatory effects of SCFAs on *** tissue-and disease-specific effects of dietary fiber,SCFAs and SCFA-producing microbes on major types of autoimmune diseases,including type I diabetes,multiple sclerosis,rheumatoid arthritis and lupus,are ***,their key regulatory mechanisms for lymphocyte development,tissue barrier function,host metabolism,immunity,autoantibody production,and inflammatory effector and regulatory lymphocytes are *** shared and differential effects of SCFAs on different types and stages of autoimmune diseases are discussed.

关键词： Short-chain fatty acids Immune tolerance Diabetes mellitus Rheumatoid arthritis Lupus Multiple sclerosis

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Control of lymphocyte functions by gut microbiota-derived short-chain fatty acids

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Cellular & Molecular Immunology 2021年第5期18卷 1161-1171页

作者： chang h.Kim Department of Pathology and Mary h.Weiser Food Allergy Center University of Michigan School of MedicineAnn ArborMIUSA

A mounting body of evidence indicates that dietary fiber(DF)metabolites produced by commensal bacteria play essential roles in balancing the immune ***,considered nonessential nutrients in the past,is now considered to be necessary to maintain adequate levels of immunity and suppress inflammatory and allergic ***-chain fatty acids(SCFAs),such as acetate,propionate,and butyrate,are the major DF metabolites and mostly produced by specialized commensal bacteria that are capable of breaking down DF into simpler saccharides and further metabolizing the saccharides into *** act on many cell types to regulate a number of important biological processes,including host metabolism,intestinal functions,and immunity *** review specifically highlights the regulatory functions of DF and SCFAs in the immune system with a focus on major innate and adaptive *** information regarding how SCFAs regulate innate lymphoid cells,t helper cells,cytotoxic t cells,and B cells and how these functions impact immunity,inflammation,and allergic responses are discussed.

关键词： Microbiota Dietary fiber Short-chain fatty acids Innate lymphoid cells B cells th1 th17 tregs CD8 Microbial metabolites

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Influence of austenization temperature on the erosion behavior of austempered ductile irons

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Journal of University of Science and technology Beijing 2008年第1期15卷 29-33页

作者： L.C. chang L C. hsui L.h. Chen S.t. Lui Department of Mechanical Engineering Technology and Science Institute of Northern Taiwan Taipei 112 China Talpei Department of Materials Science and Engineering Cheng-Kung University Talnan 800 China Taipei

the erosion behavior of austempered ductile irons austenized at different temperatures was studied. the results indicate that the erosion rate well correlates with the mechanical properties. At high impact angles, increasing ductility and mechanical energy density results in decreasing erosion rate, whereas increasing hardness reduces the erosion rate at low impact angles. 2008 University of Science and technology Beijing. All rights reserved.

关键词： austempered ductile iron erosion mechanical properties austenization

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thE ELECtROChEMICAL BEhAVIOR OF OCEANIC MICROBIOLOGICAL INFLUENCED CORROSION ON CARBON StEEL

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Acta Metallurgica Sinica(English Letters) 2007年第5期20卷 334-340页

作者： X.t. chang Y.S. Yin G.h. Niu t. Liu S. Cheng S.B. Sun Institute of Materials Science and technology Ocean University of China Qingdao 266003 China College of Materials Science and technology Shandong University Jinan 250061 China

the corrosion behavior of carbon steel in the medium of marine microorganisms was investigated by electrochemical impedance spectra, polarization curves, and so on. Experimental results showed that the corrosion potential of carbon steel moved in a negative direction in the unpurified marine microorganism solution, and the polarization style of the cathodic process did not change. the electrochemical impedance spectra showed that the impedance value of the electrode decreased in the medium with bacteria, which indicated that the existence of microorganism could accelerate the corrosion progress of carbon steel.

关键词： carbon steel microbiological influenced corrosion polarization curve electrochemical impedance spectroscopy

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On the formation of shear bands in a metallic glass under tailored complex stress fields

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Journal of Materials Science & technology 2020年第18期52卷 112-117页

作者： S.h.Chen t.Li W.J.chang h.D.Yang J.C.Zhang h.h.tang S.D.Feng F.F.Wu Y.C Wu School of Mechanical Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Metastable Materials Science and technology Yanshan UniversityQinhuangdao 066004China School of Materials Science and Engineering Liaoning University of TechnologyJinzhou 121001China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China

the formation of shear bands in metallic glasses(MGs)was examined by tailoring localized complex stress fields(LCSFs).the findings have shown that the LCSFs in MGs can increase the localization of strained atoms and accelerate the release of accumulated deformation energy for initiating a shear band in confined and thin-layered *** findings not only add more knowledge to the formation mechanisms of shear bands in MGs,but also provide possible rationale for the discrepancies in the mechanical properties of different-sized *** compared with the bulk samples,the higher strength and larger elastic limits in nanoscaled MGs could be attributed to the elimination of stress-concentrators,which can serve as LCSFs.

关键词： Localized complex stress field Shear band Metallic glass Molecular dynamics simulation Size effect

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thE BEGINNING OF thE USING OF ZINC IN ChINA.

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地质学报 1923年第Z1期 17-27页

作者： h.t.chang

In my work, Lapidarium Sinicum, the chapter on brass is speciallydevoted to this inquiry. Recently Dr. Read of the U. S. Bureau of Mineswrote to Dr. ting, suggesting the question whether "the knowledge ofzinc-smelting... 详细信息

关键词： thE BEGINNING OF thE USING OF ZINC IN ChINA In 加比

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thEOREtICAL PREDICtION OF thE KINEtICS CURVES OFPEARLItIC tRANSFORMAtION IN hYPO-PROEUtECtOID StRUCtURAL StEELS

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Acta Metallurgica Sinica(English Letters) 1998年第3期11卷 215-224页

作者： Z.G.Li h.B.chang t.Y.hsu Z.Y.Xu X.Y.Ruan Shanghai Jiaotong Univ Shanghai China

Supposing carbon contents of ferrite phases in pearlite precipitating from austenite in multicomponent steel at temperature t and in Fe-C ystem at t' are the same the pearlite formation temperature diference, can be calculated from the FeX phase diagrams and the equilibrium temperature Al. Using tp and Fe-C binary thermodynamic model, the driving forces for phase transformation from austenite to pearlite in multicomponent steels have been successfully calculated. through the combination of simplified Zener and hillert's model for pearlite growth with Johnson-Mehl equation, using data from known ttt diagrams, the interfacial energy parameter and activation energy for pearlite formation can be determined and expressed as functions of chemical composition in steels by regression analysis. the calculated starting curves of pearlitic transformation in some commercial steels agree well with the experimental data.

关键词： pearlite formation temperature difference interfacial energy parameter activation enerpy for pearlite transformation,Johnson-Mehl equation

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thEOREtICAL PREDICtION OF PROEUtECtOID FERRItICtRANSFORMAtION IN hYPO-PROEUtECtOID StRUCtRAL StEELS

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Acta Metallurgica Sinica(English Letters) 1998年第3期11卷 207-214页

作者： h.B.chang Z.G.Li t.Y.hsu Z.Y.Xu X.Y.Ruan Shanghai technical Coll of Metallurgy Shanghai China

Proeutectoid ferrite with carbon content xo precipitating from austenite in a multicomponent steel at temperature t is supposed to be equivalent to proeutectoid ferrite with the same carbon content precipitating from austenite in Fe-C binary system at temperature t'.is described as the temperature difference of proeutectiod ferrite formation, and can be calculated from the Fe-X diagrams and the equilibrium temperature A3. By introducing tf and basing on the thermodynamic model for Fe-C binary alloy, the driving force for phase transformation from austenite to proeutectoid ferrite in multicomponent steels has been successfully calculated. through the Johnson-Mehl equation and using the data hem known ttt diagrams, the relationship between the chemical composition and the intedecial edenly packeter as well as activation energy for proeutectoid ferrite formation can be calculated. the starting curves of proeutectoid ferritic transformation calculated in this way in some hypo-proeutectoid structural steels agree well with the erperimental data.

关键词： proeutectoid ferrite formation temperature difference interfacial enerpy parameters activation energy for diffusion Johnson-Mehl equation

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