Abstract

The deformation of closed-cell aluminum foam (CAF) in different solid–liquid–gas coexisting state was studied in this paper. The results showed that the most suitable temperature of the CAF deformation was about 635 °C, which made the CAF have maximum deformation, but its characteristic parameters changed slightly. Moreover, the multi-grain cell wall and small size cell were helpful to the CAF deformation in the solid–liquid–gas coexisting state. When the CAF deformed at 635 °C, the inter-granular solidification microstructure and part of the primary α-Al grain were melted into liquid. The fixed or inter-locked primary α-Al grain was released and changed into the distributed discretely near-spherical grain, making the cell wall have good thixotropy. At the same time, the gas pressure in the cell was recovered to the foaming stage, so the gas pressure could be close to the flow stress of cell wall. During the CAF deformation in the solid–liquid–gas coexisting state, the cell wall deformed in thixotropic under the supporting and coordinating of the gas pressure in the cell, meanwhile, the cell was moved following the cell wall deformation. Therefore, the CAF deformation was affected by the types of the cell walls and the cell size.

Graphic Abstract

In this paper, the mold forming process was used to study the influence of temperature on deformation of the closed-cell aluminum foam (CAF) that in solid–liquid–gas coexisting state. When the CAF was deformed in solid–liquid–gas coexisting state who has strong deformation capacity, moreover, whose characteristic parameters are largely unchanged. However, shape forming of the closed cell aluminum foam only could be realized in specific solid–liquid–gas coexisting state, which was mainly related to the deformation temperature.

中文翻译：

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固液气共存状态下闭孔铝泡沫的变形研究

抽象的

本文研究了闭孔泡沫铝在不同固液共存状态下的变形。结果表明，最合适的CAF变形温度约为635°C，使CAF变形最大，但其特征参数略有变化。此外，在固-液-气共存状态下，多颗粒的细胞壁和小尺寸的细胞有助于CAF的变形。当CAF在635°C下变形时，晶粒间的凝固组织和部分初生α-Al晶粒融化为液体。固定或互锁的初生α-Al晶粒被释放并变成分散分布的近球形晶粒，使细胞壁具有良好的触变性。同时，将小室中的气压恢复到发泡阶段，因此气体压力可能接近细胞壁的流动应力。在固液气共存的CAF变形过程中，在细胞内气体压力的支持和协调下，细胞壁发生触变变形，同时，细胞随细胞壁变形而移动。因此，CAF变形受单元壁类型和单元大小的影响。

图形摘要

在本文中，使用模具成型工艺研究了温度对固液-气共存的闭孔泡沫铝（CAF）变形的影响。此外，当CAF在固液气共存状态下发生变形时，其变形能力强，其特征参数在很大程度上不变。然而，闭孔泡沫铝的形状形成只能在特定的固液气共存状态下实现，这主要与变形温度有关。