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Structure Transition Mechanism in Undercooled CuNi Alloys

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Journal of Wuhan University of Technology(Materials Science) 2021年第6期36卷 880-883页

作者： AN Hongen nancy julius siambun Bih-Lii Chuab Melvin Gan Jet Hong LI Hongtao Faculty of Engineering University Malaysia SabahKota Kinabalu 88400Malaysia College of Mechanical and Electronic Engineering Huanghe Jiaotong UniversityJiaozuo 454950China Henan Engineering Technology Research Center on Intelligent Manufacturing Technology and Equipment Jiaozuo 454950China

Taking a Cu55Ni45 alloy as experimental alloy systems,we systematically studied the method of obtaining deep undercooling of alloy *** deep undercooling of alloy melt was obtained by the combination of molten glass purification and cyclic *** with the nucleation and growth mechanism of undercooled melt,the microstructure evolution and grain refinement mechanism of the alloy were systematically studied in a wide undercooling *** grain refinement solidification structure under large undercooling was analyzed by EBSD *** with the typical characteristics of recrystallization in metallographic pictures,it was finally confirmed that the grain refinement was caused by recrystallization.

关键词： microstructure refinement undercooling Cu-Ni alloys

Microstructure Transition and Grain Refinement Mechanism of Undercooled Alloys

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Journal of Wuhan University of Technology(Materials Science) 2021年第6期36卷 922-926页

作者： LI Hongtao nancy julius siambun Bih-Lii Chuab Melvin Gan Jet Hong AN Hongen College of Mechanical and Electronic Engineering Huanghe Jiaotong UniversityJiaozuo 454950China Faculty of Engineering University Malaysia SabahKota Kinabalu 88400Malaysia Henan Engineering Technology Research Center on Intelligent Manufacturing Technology and Equipment Jiaozuo 454950China

The solidification microstructures of undercooled Ni90Cu10 alloys under different undercoolings were studied systematically by means of melt coating and cyclic *** the obtained undercooling range,the solidification structures of the two undercooled alloys have similar transformation processes,and there are two kinds of grain refinement structures under the conditions of low undercooling and high undercooling,*** microstructures of the two grain refinement processes were analyzed in more detail by electronic backscattering diffraction *** the condition of small undercooling,dendrite remelting is considered to be the main reason of grain ***,under the condition of high undercooling,the existence of annealing twins and obvious migration of grain boundary are important evidences for the occurrence of recrystallization process.

关键词： microstructure transition grain refinement undercoolcd alloys Ni-Cu alloys

Microstructure Transformation of Undercooled Cu-Ni-Co Alloy and Refinement Mechanism under High Undercooling

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Journal of Wuhan University of Technology(Materials Science) 2023年第2期38卷 440-444页

作者： AN Hongen Willey Liew Yun Hsien nancy julius siambun Bih-Li Chuab YANG Mengmeng YAN Wei LI Hongtao Faculty of Engineering University Malaysia SabahKota Kinabalu88400Malaysia College of Mechanical and Electronic Engineering Huanghe Jiaotong UniversityJiaozuo454950China Henan Engineering Technology Research Center on Intelligent Manufacturing Technology and Equipment Jiaozuo454950China

The molten Cu60Ni35Co5 ternary alloy was undercooled by fluxing method and solidified by natural cooling *** microstructure of all undercooled samples were *** is found that the rapidly solidified Cu60Ni35Co5 alloy has undergone two grain refinement phenomena within the undercooling range,and its microstructure and morphology change with the undercooling through the transformation process of“coarse dendrite-equiaxed dendrite-oriented fine dendrite-equiaxed crystal”.The refined structure with the maximum undercooling?T of 253 K was selected for electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM)*** results show that the refined structure contains a high proportion of large angle grain boundaries(LAGBs),a large number of randomly oriented grains,and high proportion of twins,while TEM results show that the dislocation density in most areas is relatively *** above characteristics confirm that the solidification structure is refined due to recrystallization behavior under high undercooling.

关键词： microstructure grain refinement recrystallization

Refinement Mechanism of Microstructure of Undercooled Nickel Based Alloys

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Journal of Wuhan University of Technology(Materials Science) 2024年第4期39卷 1041-1047页

作者：杜文华 HOU Kai XU Xuguang Ismal Saad Willey Liew Yun Hsien AN Hongen nancy julius siambun Bih-Lii Chuab 王洪福 College of Mechanical Engineering North University of ChinaTaiyuan 030051China Faculty of Engineering University Malaysia SabahKota Kinabalu 88400Malaysia

Through the use of purification and recirculation superheating techniques on molten glass,the Ni65Cu33Co2 alloy was successfully undercooled to a maximum temperature of 292 ***-speed photography was employed to capture the process of interface migration of the alloy liquid,allowing for an analysis of the relationship between the morphological characteristics of the alloy liquid solidification front and the degree of ***,the microstructure of the alloy was examined using metallographic microscopy,leading to a systematic study of the microscopic morphological characteristics and evolution laws of the refined structure during rapid *** research reveals that the grain refining mechanism of the Ni-Cu-Co ternary alloy is consistent with that of the binary alloy(Ni-Cu).Specifically,under low undercooling conditions,intense dendritic remelting was found to cause grain refinement,while under high undercooling conditions,recrystallization driven by accumulated stress and plastic strain resulting from the interaction between the liquid flow and the primary dendrites caused by rapid solidification was identified as the main factor contributing to grain ***,the study highlights the significant role of the Co element in influencing the solidification rate and reheat effect of the *** addition of Co was also found to facilitate the formation of non-segregated solidification structure,indicating its importance in the overall solidification process.

关键词： grain refinement recalescence recrystallization undercooling

Limited validity of Mayo endoscopic subscore in ulcerative colitis with concomitant primary sclerosing cholangitis

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World Journal of Gastrointestinal Endoscopy 2024年第11期16卷 607-616页

作者： Pavel Wohl Alzbeta Krausova Petr Wohl Ondrej Fabian Lukas Bajer Jan Brezina Pavel Drastich Mojmir Hlavaty Petra Novotna Michal Kahle julius Spicak Martin Gregor Department of Gastroenterology Institute for Clinical and Experimental MedicinePrague 14021Czech Republic Department of Integrative Biology Institute of Molecular Genetics of the Czech Academy of SciencesPrague 14220Czech Republic Department of Metabolism and Diabetes Institute for Clinical and Experimental MedicinePrague 14021Czech Republic Clinical and Transplant Pathology Centre Institute for Clinical and Experimental MedicinePrague 14021Czech Republic Department of Data Analysis Statistics and Artificial IntelligenceInstitute for Clinical and Experimental MedicinePrague 14021Czech Republic

BACKGROUND Ulcerative colitis(UC)with concomitant primary sclerosing cholangitis(PSC)represents a distinct disease entity(PSC-UC).Mayo endoscopic subscore(MES)is a standard tool for assessing disease activity in UC but its relevance in PSC-UC remains *** To assess the accuracy of MES in UC and PSC-UC patients,we performed histological scoring using nancy histological index(NHI).METHODS MES was assessed in 30 PSC-UC and 29 UC adult patients during *** and inflammation were evaluated in biopsies from the cecum,rectum,and terminal *** addition,perinuclear anti-neutrophil cytoplasmic antibodies,fecal calprotectin,body mass index,and other relevant clinical characteristics were *** The median MES and NHI were similar for UC patients(MES grade 2 and NHI grade 2 in the rectum)but were different for PSC-UC patients(MES grade 0 and NHI grade 2 in the cecum).There was a correlation between MES and NHI for UC patients(Spearman's r=0.40,P=0.029)but not for PSC-UC *** examination revealed persistent microscopic inflammation in 88%of PSC-UC patients with MES grade 0(46%of all PSC-UC patients).Moreover,MES overestimated the severity of active inflammation in an additional 11%of PSCUC *** MES insufficiently identifies microscopic inflammation in *** indicates that histological evaluation should become a routine procedure of the diagnostic and grading system in both PSC-UC and PSC.

关键词： Primary sclerosing cholangitis Ulcerative colitis Diagnosis nancy histological index Mayo endoscopic subscore