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首页> 外文期刊>ISIJ international >In Situ Synchrotron X-ray Characterization of Microstructure Formation in Solidification Processing of Al-based Metallic Alloys
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In Situ Synchrotron X-ray Characterization of Microstructure Formation in Solidification Processing of Al-based Metallic Alloys

机译：铝基金属合金凝固过程中显微组织形成的原位同步X射线表征

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摘要

The microstructure formed during the solidification step has a major influence on the properties of materials processed by major techniques (casting, welding ...). In situ and real-time characterization by synchro-. tron X-ray imaging is the method of choice to unveil the dynamical formation of the solidification microstructure in metallic alloys, and thus provide precise data for the critical validation of the theoretical predictions that is needed for sound advancement of modeling and numerical simulation. After a description of the experimental procedure used at the European Synchrotron Radiation Facility (ESRF), dynamical phenomena in the formation of the grain structure and dendritic or equiaxed solidification microstructure in Al-based alloys are presented. Beyond fluid flow interaction, earth gravity induces stresses, deformation and fragmentation in the dendritic mush. Settling of dendrite arms and equiaxed grains thus occurs, in particular in the columnar to equiaxed transition. Other types of stresses and strains are caused by the mere formation of the solidification microstructure itself. In white-beam X-ray topography, stresses and strains are manifested by specific contrasts and breaking of the Laue images into several pieces. Finally, quantitative analysis of the grey level in radiographs enables the analysis of solute segregation, which noticeably results in solutal poisoning of growth when equiaxed grains are interacting.
机译：在固化步骤中形成的微观结构对通过主要技术（铸造，焊接...）加工的材料的性能具有重大影响。通过同步原位和实时表征。 tron X射线成像是揭示金属合金中凝固微观结构的动态形成的一种选择方法，因此可以为建模和数值模拟的合理发展所需的理论预测的关键验证提供精确的数据。在描述了欧洲同步加速器辐射设施（ESRF）所使用的实验程序之后，提出了铝基合金中晶粒结构形成和树枝状或等轴凝固组织的动力学现象。除流体流动相互作用外，地球重力还引起树枝状糊状物中的应力，变形和破碎。因此发生枝晶臂和等轴晶粒的沉降，特别是在柱状到等轴过渡中。其他类型的应力和应变是由固化微结构本身的单纯形成引起的。在白光束X射线形貌中，应力和应变通过特定的对比和将劳厄（Laue）图像分成几部分来显示。最后，对X射线照片中的灰度进行定量分析可以分析溶质偏析，当等轴粒相互作用时，明显导致生长的溶出中毒。

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  • 来源
    《ISIJ international》 |2010年第12期|p.1929-1935|共7页
  • 作者

    Bernard BILLIA; Henri NGUYEN-THI; Nathalie MANGELINCK-NOEL; Nathalie BERGEON; Hyejin JUNG; Guillaume REINHART; Aziz BOGNO; Adeline BUFFET; Juergen HARTWIG; Jose BARUCHEL; Thomas SCHENK;

  • 作者单位

    Aix-Marseille Universite, Case 142, 13397 Marseille Cedex 20, France,CNRS, Institut Materiaux Microelectronique Nanosciences de Provence (IM2NP), Campus scientifique de Saint-Jerome, Case 142, 13397 Marseille Cedex 20, France;

    Aix-Marseille Universite, Case 142, 13397 Marseille Cedex 20, France,CNRS, Institut Materiaux Microelectronique Nanosciences de Provence (IM2NP), Campus scientifique de Saint-Jerome, Case 142, 13397 Marseille Cedex 20, France;

    Aix-Marseille Universite, Case 142, 13397 Marseille Cedex 20, France,CNRS, Institut Materiaux Microelectronique Nanosciences de Provence (IM2NP), Campus scientifique de Saint-Jerome, Case 142, 13397 Marseille Cedex 20, France;

    Aix-Marseille Universite, Case 142, 13397 Marseille Cedex 20, France,CNRS, Institut Materiaux Microelectronique Nanosciences de Provence (IM2NP), Campus scientifique de Saint-Jerome, Case 142, 13397 Marseille Cedex 20, France;

    Aix-Marseille Universite, Case 142, 13397 Marseille Cedex 20, France,CNRS, Institut Materiaux Microelectronique Nanosciences de Provence (IM2NP), Campus scientifique de Saint-Jerome, Case 142, 13397 Marseille Cedex 20, France;

    Aix-Marseille Universite, Case 142, 13397 Marseille Cedex 20, France,CNRS, Institut Materiaux Microelectronique Nanosciences de Provence (IM2NP), Campus scientifique de Saint-Jerome, Case 142, 13397 Marseille Cedex 20, France;

    Aix-Marseille Universite, Case 142, 13397 Marseille Cedex 20, France,CNRS, Institut Materiaux Microelectronique Nanosciences de Provence (IM2NP), Campus scientifique de Saint-Jerome, Case 142, 13397 Marseille Cedex 20, France;

    European Synchrotron Radiation Facility (ESRF), Polygone Scientifique Louis Neel, BP220, 38043 Grenoble Cedex, France;

    European Synchrotron Radiation Facility (ESRF), Polygone Scientifique Louis Neel, BP220, 38043 Grenoble Cedex, France;

    European Synchrotron Radiation Facility (ESRF), Polygone Scientifique Louis Neel, BP220, 38043 Grenoble Cedex, France;

    Institut Jean Lamour, Ecole des Mines de Nancy, Parc de Saurupt, CS 14234, 54042 Nancy Cedex France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    solidification; alloys; metallic systems; dendrites; equiaxed growth; columnar-equiaxed transi- tion; synchrotron imaging; radiography; topography; strains; stresses; solute segregation;

    机译：凝固;合金;金属系统;树突等轴增长;柱状平衡的过渡;同步加速器成像射线照相地形;应变压力溶质偏析;

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