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铝合金热变形组织演化的模拟

材料科学与工艺 2001年第3期9卷 329-333页

作者：沈健 g.gottstein 北京有色金属研究总院北京100088 InstitutfürMetallkundeundMetallphysik

采用基于位错攀移及位错间交互作用的多元位错模型 ,对Al -Mg -Si(6 0 0 5 )合金热变形过程中亚晶内位错密度、亚晶界位错密度、可动位错位错密度及总的位错密度的演化进行了计算机模拟 ,并由此对Al-Mg -Si合金热压缩过程中的流变应力... 详细信息

采用基于位错攀移及位错间交互作用的多元位错模型 ,对Al -Mg -Si(6 0 0 5 )合金热变形过程中亚晶内位错密度、亚晶界位错密度、可动位错位错密度及总的位错密度的演化进行了计算机模拟 ,并由此对Al-Mg -Si合金热压缩过程中的流变应力演化进行预报 .模拟结果和试验结果吻合较好 .采用试验研究的方法建立了亚晶尺寸随变形条件演化的半经验关系模型。

关键词： 6005铝合金组织演化位错热变形热压缩多元位错模型计算机模拟

Physicalthrough-Process Simulation: Fromphysical Modeling to Engineering Predictions

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Physicalthrough-Process Simulation: Fromphysical Modeling to...

Relationships between deformation mechanisms and initial textures in polycrystalline magnesium alloys AZ31

The Fourth International Conference on Physical and Numerical Simulation of Materials (ICPNS’2004)

作者： g.gottstein M.Crumbach M.goerdeler R.Kopp L.Neumann Institute of Physical metallurgy and Metal Physics RWTH Aachen University 52056 Aachen Germany Institute of Physical metallurgy and Metal Physics RWTH Aachen University 52056 Aachen Germany Institute of Physical metallurgy and Metal Physics RWTH Aachen University 52056 Aachen Germany Institut for Metal Forming RWTH Aachen University 52056 Aachen Germany Institut for Metal Forming RWTH Aachen University 52056 Aachen Germany

＜正＞In conventional engineering practice, modeling of materials behavior and properties is based on empirical mathematical relations which are fit to measured data. Although the mathematical fit is usually excellent, these relations are strictly limited to the range of measured data. Any predictions beyond this range are uncertain and may be totally wrong. Therefore, these models cannot be utilized for alloy development or process *** properties of a metallic material are determined by its microstructure, i.e. the spatial distribution of elements and crystal defects. The microstructure, therefore, constitutes the static variables of material properties, and the prediction of material performance has to be based on its microstructure. Unfortunately, the microstructure is bound to change during processing so that microstructure modeling of a finished product requires incorporation of its entire processing history. While there are only three major microstructural processes, namely deformation, phase transformation, and recrystallization （and related processes） the mutual interaction of their mechanisms leads to a virtual unlimited variety of microstructures and thus, to a large spectrum of material properties, or from high quality to *** present an approach to account for microstructural evolution through the process chain. For this mesoscopic microstructural models were developed which can be interfaced to both atomic computations, like molecular dynamics, and engineering process codes, like FEM. As a case study we present the simulation of the processing of aluminum alloy AA5182 from hot rolling to back annealing and sheet forming. Texture, microstructure and anisotropy during deep drawing are predicted and compared to subsequently performed experiments.

关键词： Simulation Modeling Engineering predictions

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中国有色金属学会会刊：英文版 2003年第2期13卷 280-284页

作者：杨平崔凤娥边建华 g.gottstein School of Materials Science and Engineering University of Science and Technology Beijing Institut für Metallkunde und Metallphysik

Microscopy, X ray diffractometry and EBSD analysis were applied to inspect the relationships between deformation mechanisms and initial textures in polycrystalline magnesium alloys AZ31. It is found that different deformation mechanisms proceed according to theoretic prediction. Basal slips occur when basal planes of grains are tilted toward normal direction(ND) around transverse direction(TD); prism slips dominate when basal planes are perpendicular to TD. {1012} twinning was favored when basal planes are normal to rolling direction(RD) and {1011} twinning is analyzed to be related to the basal orientation of grains.

关键词： AZ31合金多晶镁合金变形机理初始组织相关分析

Influence of initial textures on dynamic recrystallization and textures in AZ31 magnesium alloys

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中国有色金属学会会刊：英文版 2003年第3期13卷 504-508页

作者：杨平崔凤娥马世才 g.gottstein School of Materials Science and Engineering Institut für Metallkunde und Metallphysik

Microscopy and X ray diffractometry were applied to inspect the influence of initial texture on dynamic recrystallization and texture formation in AZ31 magnesium alloys during channel die compression. The results show that stress-strain curves, microstructures and textures depend on initial textures. Two types of nucleation sites are detected which are in different proportions depending on initial textures. Dynamic recrystallization proceeds faster in samples with more inhomogeneity. When the basal planes of grains are parallel to rolling plane of sample with scattering around transverse direction, no new texture component occurs and texture is strengthened together with dynamic recrystallization. By other initial textures there are texture changes during hot deformation. New grains rotate gradually to basal orientation at heavy strain.

关键词： AZ31合金镁合金再结晶动力学结构 X射线分析显微分析

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晶界内耗峰在高温形变中的变化

中山大学学报（自然科学版） 2001年第z2期40卷 208-210页

作者：孔庆平蔡彬 gottstein g 中国科学院固体物理研究所内耗与固体缺陷开放研究实验室合肥230031 德国亚琛工业大学金属学和金属物理研究所

研究晶界内耗峰在３种高温形变模式下（静态蠕变、循环蠕变、循环扭转）的变化，以研究晶界在高温形变过程中的行为和作用．

关键词：晶界内耗峰高温变形

Fasciola hepatica in a country of low incidence: a tricky diagnosis

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Hepatobiliary Surgery and Nutrition 2019年第6期8卷 597-603页

作者： Stéphanie Perrodin Laura Walti Bruno gottstein Corina Kim-Fuchs Daniel Candinas Vanessa Banz Department of Visceral Surgery and Medicine Bern University Hospital and University of BernBernSwitzerland Department of Infectious Diseases InselspitalBern University Hospital and University of BernBernSwitzerland Department of Infectious Diseases and Pathobiology Vetsuisse FacultyInstitute of ParasitologyUniversity of BernBernSwitzerland

Background:Fasciola hepatica is a foodborne trematode present *** hosts are mostly ruminants such as cattle and sheep,as well as *** Switzerland,Fasciola infection in humans is ***,many patients are likely to undergo multiple unnecessary investigations before the parasite is suspected and fascioliasis diagnosed,especially if symptoms are ***:Retrospective analysis of all patients diagnosed with Fasciola hepatica at the University Hospital of Bern between 2005 and *** was positive if a positive serology and/or eggs in stool samples correlated with clinical presentation(symptoms and/or imaging).Patients were excluded if serology was weakly positive and another diagnosis more *** data,laboratory results,imaging,proposed treatment and outcome were collected from patient ***:Sixty patients had a positive serology during this time ***-seven of them had a more plausible alternative diagnosis and were not included in the study,leaving 13 patients for analyses;46.2%(6/13)were male,mean age was 45.8 years old(range,17-80 years old).Four patients(4/13,30.8%)were asymptomatic,nine(9/13,69.2%)presented with symptoms ranging from right upper quadrant abdominal pain(44.4%)and generalized pruritus(33.3%)to weight loss and night sweats(33.3%).The mean duration of symptoms until correct diagnosis was 8.9 months(range,1-48 months).Five patients(5/13,38.5%)had documented eosinophilia,four(4/13,30.8%)elevated liver enzymes and seven(7/13,53.8%)elevated cholestasis *** antibody level on serology was 88 AU/mL(range,3-134 AU/mL).Ultrasound was used most frequently(7/13,53.8%),followed by magnetic resonance imaging(4/13,30.8%),computed tomography and endoscopic retrograde cholangiopancreatography(3/13,23.1%).The most common findings were bile duct dilatation,followed by hepatic *** consisted of Triclabendazole 10 mg/*** patient needed a second treatment course for pers

关键词： Fasciola hepatica zoonosis diagnosis Europe

FORMATION OF RECRYSTALLIZATION TEXTURE WITH ROLLINg ORIENTATION IN Al-1.3%Mn ALLOY

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中国有色金属学会会刊：英文版 1998年第3期8卷 8-17页

作者： Yang Ping , O. Engler and g. gottstein Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China Los Alamos National Laboratory, Center for Materials Science, Mail St Univ of Science and Technology Beijing Beijing China

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｃｏｍｍｅｒｃｉａｌｐｕｒｅＡｌ（１ｘｘｘｓｅｒｉｅｓ）ｗｉｔｈＦｅａｎｄＳｉ，ｔｈｅｒｅｃｒｙｓｔａｌｉｚａｔｉｏｎｔｅｘｔｕｒｅｗｉｔｈｒｏｌｉｎｇｏｒｉｅｎｔａｔｉｏｎ，ｉｅｔｈｅ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｃｏｍｍｅｒｃｉａｌｐｕｒｅＡｌ（１ｘｘｘｓｅｒｉｅｓ）ｗｉｔｈＦｅａｎｄＳｉ，ｔｈｅｒｅｃｒｙｓｔａｌｉｚａｔｉｏｎｔｅｘｔｕｒｅｗｉｔｈｒｏｌｉｎｇｏｒｉｅｎｔａｔｉｏｎ，ｉｅｔｈｅＲｔｅｘｔｕｒｅ｛１２４｝〈６１２...

关键词： recrystallization texture AlMn ODF

多房棘球绦虫DNA探针的特征、测序及在PCR中的应用

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地方病译丛 1992年第3期13卷 43-45页

作者： B gottstein 李新兰

最近 Vogel 等氏报告了一种在多房棘球绦虫的识别方面具有潜在应用价值的 DNA 探针 pAL1。克隆化的 DNA 片段被用于 Southern杂交分析以及细粒棘球绦虫和多房棘球绦虫分离物的鉴别。为使探针 pAL1能在高敏感、高特异的 PCR 中得到应用,... 详细信息

最近 Vogel 等氏报告了一种在多房棘球绦虫的识别方面具有潜在应用价值的 DNA 探针 pAL1。克隆化的 DNA 片段被用于 Southern杂交分析以及细粒棘球绦虫和多房棘球绦虫分离物的鉴别。为使探针 pAL1能在高敏感、高特异的 PCR 中得到应用,以达到诊断目的,在本研究中我们对该探针进行了详细的研究。

关键词：棘球绦虫 DNA探针 PCR

Integral Recrystallization Modelling

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Journal of Shanghai Jiaotong university(Science) 2000年第1期5卷 49-57页

作者： g. gottstein, V. Marx, R. Sebald Institut furr Metallkunde und Metallphysik, RWTH Aachen, 52056 Aachen, germany

We present models designed to represent the evolution of microstructure and crystallographic texture during recrystallization. For engineering applications the models are tied to a finite element approach. A connection to the deformed microstructure is established by dislocation theory of work hardening and Taylor type texture simulations. For temporal and spatial resolution a modified cellular automaton model was developed. A fast statistical approach for prediction of recrystallization kinetics and texture development discrete in time is presented. Predictions of the models are compared with experimental data.

关键词： modelling cellular automaton statistical model primary static recrystallization recovery crystallographic orientation