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Temperature-dependent mechanical behavior of three-dimensionally ordered macroporous tungsten

机译：三维有序大孔钨的温度依赖性机械行为

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摘要

Porous metals represent a class of materials where the interplay of ligament length, width, node structure, and local geometry/curvature offers a rich parameter space for the study of critical length scales on mechanical behavior. Colloidal crystal templating of three-dimensionally ordered macroporous (300M, i.e., inverse opal) tungsten provides a unique structure to investigate the mechanical behavior at small length scales across the brittle-ductile transition. Micropillar compression tests show failure at 50 MPa contact pressure at 30 °C, implying a ligament yield strength of approximately 6.1 GPa for a structure with 5% relative density. In situ SEM frustum indentation tests with in-plane strain maps perpendicular to loading indicate local compressive strains of approximately 2% at failure at 30 °C. Increased sustained contact pressure is observed at 225 °C, although large (20%) nonlocal strains appear at 125 °C The elevated-temperature mechanical performance is limited by cracks that initiate on planes of greatest shear under the indenter.
机译：多孔金属代表一类材料，其中韧带长度，宽度，节点结构和局部几何/曲率的相互作用提供了丰富的参数空间，用于研究机械行为上的临界长度尺度。胶体晶体模板的三维有序的大孔（300m，即反蛋白石）钨提供了一种独特的结构，以研究脆性延展转换的小长度尺度下的机械行为。微米压缩试验在30℃下显示50mPa接触压力的故障，暗示具有5％相对密度的结构的韧带屈服强度约为6.1GPa。在原位SEM截头缩进试验，垂直于加载的面内应变映射指示在30℃下发生故障的局部压缩菌株约2％。在225℃下观察到增加的持续接触压力，但大（20％）非局部菌株出现在125℃时，升高的温度机械性能受到在压头下最大剪切的裂缝的限制。

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  • 来源
    《Journal of Materials Research》 |2020年第19期|2556-2566|共11页
  • 作者

    Kevin M. Schmalbach; Zhao Wang; R. Lee Penn; David Poerschke; Antonia Antoniou; Andreas Stein; Nathan A. Mara;

  • 作者单位

    Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis Minnesota 55455 USA;

    Department of Chemistry University of Minnesota Minneapolis Minnesota 55455 USA;

    Department of Chemistry University of Minnesota Minneapolis Minnesota 55455 USA;

    Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis Minnesota 55455 USA;

    George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA;

    Department of Chemistry University of Minnesota Minneapolis Minnesota 55455 USA;

    Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis Minnesota 55455 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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