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Deformation mechanics and microstructure evolution during indirect extrusion in (sub) mm-scale samples

机译：（亚）毫米级样品间接挤压过程中的变形力学和微观结构演变

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摘要

Mechanics of deformation in miniaturized indirect extrusion (IE) and their resulting process outcomes are shown to be dependent on the dimensional scale of the plastic deformation zone. Using optically transparent dies as prototypes, the effect of process length-scales on the strain, strain-rate, and rotation fields is elucidated using digital image correlation. In this regard, in situ experiments were performed on commercially pure Lead (Pb) and Aluminum (Al 1100) as prototypical nonwork/work hardening materials. By overlaying these measurements with microstructural characterization via electron backscattered diffraction, the effect of deformation volume on process-structure mappings is identified. Herein, visco-plastic self-consistent framework-based modeling of the evolution of crystallographic textures was investigated to achieve insights into the trajectories of microstructure evolution and process outcomes during IE. These findings provide a beneficial background about characteristics of plastic deformation zone and its distribution to optimize and control the properties of miniaturized components.
机译：微型间接挤压（IE）中的变形力学及其产生的过程结果显示，取决于塑性变形区的尺寸范围。使用光学透明的模具作为原型，使用数字图像相关性可以阐明工艺长度尺度对应变，应变率和旋转场的影响。在这方面，对作为原型非工作/工作硬化材料的商业纯铅（Pb）和铝（Al 1100）进行了原位实验。通过将这些测量值与通过电子反向散射衍射进行的微结构表征相叠加，可以确定变形量对过程结构映射的影响。在本文中，研究了基于粘塑性自洽框架的结晶学织构演化模型，以了解IE期间微结构演化的轨迹和工艺结果。这些发现为塑性变形区的特性及其分布提供了有益的背景，以优化和控制小型化部件的性能。

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  • 来源
    《Journal of Materials Research》 |2016年第8期|1096-1112|共17页
  • 作者

    Marzyeh Moradi; Saurabh Basu; M. Ravi Shankar;

  • 作者单位

    Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA;

    Department of Mechanical Engineering, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30313, USA;

    Department of Industrial Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15213, USA;

  • 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);
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  • 正文语种 eng
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