Engineering the Surface Melt for In-Space Manufacturing of Aluminum Parts
Engineering the Surface Melt for In-Space Manufacturing of Aluminum Parts
复制标题
设计用于铝零件空间制造的表面熔体
DOI：
10.1007/s11665-022-07054-2
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发表时间：
2022-06-16
影响因子：
2.3
通讯作者：
Guo, Shengmin
中科院分区：
文献类型：
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作者：
Momeni, Kasra;Neshani, Sara;Guo, Shengmin
铝合金具有重量轻、熔化温度较低等优点，是空间制造的首选材料之一。使用现有的基于熔融沉积建模(FDM)技术的ISM方法印刷金属部件的一个基本问题是，最终印刷部件的完整性主要由初始颗粒之间的附着力决定。设计表面熔体可以为提高颗粒之间的粘附性铺平道路，并制造出具有更高机械完整性的部件。在这里，我们建立了一个表面熔化的相场模型，其中表面能可以直接从实验测量中得到。将所提出的模型修正为Al 7075-T6合金原料，用座滴法测量了这些合金的表面能。力学的影响已经包括了利用相变和热应变。文中将弹性能的影响与相应的无力学情况进行了比较。研究了两种不同的几何样品(圆柱形和球形)，发现与球形样品相比，圆柱形颗粒在尺寸减小时形成了更无序的结构。
Aluminum alloys are among the top candidate materials for in-space manufacturing (ISM) due to their lightweight and relatively low melting temperature. A fundamental problem in printing metallic parts using available ISM methods, based on the fused deposition modeling (FDM) technique, is that the integrity of the final printed components is determined mainly by the adhesion between the initial particles. Engineering the surface melt can pave the way to improve the adhesion between the particles and manufacture components with higher mechanical integrity. Here, we developed a phase-field model of surface melting, where the surface energy can directly be implemented from the experimental measurements. The proposed model is adjusted to Al 7075-T6 alloy feedstocks, where the surface energy of these alloys is measured using the sessile drop method. Effect of mechanics has been included using transformation and thermal strains. The effect of elastic energy is compared here with the corresponding cases without mechanics. Two different geometric samples (cylindrical and spherical) are studied, and it is found that cylindrical particles form a more disordered structure upon size reduction compared to the spherical samples.