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 (3DOM, 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.

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形状/曲率的相互作用为研究机械行为的关键长度尺度提供了丰富的参数空间。三维有序大孔（3DOM，即反蛋白石）钨的胶体晶体模板提供了一种独特的结构，可研究脆性-延性转变过程中小长度尺度上的机械行为。微柱压缩测试表明，在30°C的50 MPa接触压力下会失效，这意味着相对密度为5％的结构的韧带屈服强度约为6.1 GPa。原位具有垂直于载荷的面内应变图的SEM截头圆锥体压痕测试表明，在30°C破坏时，局部压缩应变约为2％。尽管在125°C时会出现较大的（20％）非局部应变，但在225°C时会观察到持续的接触压力增加。高温机械性能受到在压头下最大剪切平面上产生的裂纹的限制。