Abstract

Large unique block Ni–Cr–Al superalloy foam was fabricated using a combination method of powder-alloying, multi-sheet stacking, and hot compression processes. Subsequently, the compressive properties and deformation behaviors of multi-sheet stacked block metallic foam were investigated from room temperature to 1073 K. The analysis of the resulting structural characteristics of the block foam showed that the interfaces between the sheets have complex strut interactions, such as contacted (deformed) and intersected struts. The relative density was measured as 2.93% for sheet foam and 4.90% for block foam. The compressive deformation of sheet and block Ni–Cr–Al foams showed the typical compressive stress–strain curves of plastically deformable metallic foams regardless of foam type. However, different deformation behaviors in the plateau regions were detected based on the type of foam. It is noteworthy that the yield strength of block foam showed a relatively lower value than that of sheet foam, even though the block foam had higher relative density. The existence of unique interfaces in the multi-sheet stacked block foam may have affected strength and plastic deformation. Finally, distinct compressive behaviors related to the structural and microstructural characteristics of block Ni–Cr–Al foam are discussed.

Graphic Abstract

中文翻译：

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独特的多片叠层Ni-Cr-Al金属泡沫的制备及高温压缩行为

摘要

大型独特的块状Ni-Cr-Al超级泡沫是使用粉末合金化，多片堆叠和热压工艺的组合方法制成的。随后，研究了从室温到1073 K的多片堆叠式块状金属泡沫的压缩特性和变形行为。对所得块状泡沫的结构特性的分析表明，片材之间的界面具有复杂的支杆相互作用，例如接触（变形）并相交的支柱。片状泡沫的相对密度为2.93％，块状泡沫的相对密度为4.90％。片状和块状Ni-Cr-Al泡沫的压缩变形显示出可塑性变形金属泡沫的典型压缩应力-应变曲线，而与泡沫类型无关。然而，根据泡沫的类型，在高原地区发现了不同的变形行为。值得注意的是，即使块状泡沫的相对密度较高，块状泡沫的屈服强度也比片状泡沫的屈服强度低。多片叠层块状泡沫中独特界面的存在可能会影响强度和塑性变形。最后，讨论了与嵌段Ni–Cr–Al泡沫的结构和微观结构特征有关的独特压缩行为。

图形摘要