Additive manufacturing of an iron-based bulk metallic glass larger than the critical casting thickness
Additive manufacturing of an iron-based bulk metallic glass larger than the critical casting thickness
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DOI：
10.1016/j.apmt.2018.02.011
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发表时间：
2018-06-01
影响因子：
8.3
通讯作者：
Harrysson, Ola
中科院分区：
文献类型：
--
作者：
Mahbooba, Zaynab;Thorsson, Lena;Harrysson, Ola
铁基块体非晶合金（BMG）由于其独特的力学、磁学和化学性能而受到越来越多的关注。然而，在传统制造工艺中可实现的BMG的最大厚度和几何形状是有限的。这项工作研究了基于激光的粉末床增材制造（AM）生产相对较大的铁基大块金属玻璃试样的能力。AM制造的试样在所有尺寸上超过材料的临界铸造厚度15倍或更多。所得的显微组织和机械性能的报告。尽管随着构建厚度的增加淬火效果降低，但X射线衍射分析表明，在整个构建过程中保持了完全无定形结构。然而，使用高分辨率电子背散射衍射扫描发现了低浓度的稀疏分布的纳米颗粒团簇。这些结果为通过适当的材料设计和现有增材制造工艺的优化实现金属玻璃的新应用铺平了道路。(C)2018爱思唯尔有限公司版权所有。
Fe-based bulk metallic glasses (BMG) are of increasing research interest, driven in part by a unique combination of mechanical, magnetic and chemical properties. However, the maximum thickness and geometry of BMGs achievable in traditional manufacturing processes is limited. This work examines the capabilities of laser based powder bed additive manufacturing (AM) to produce relatively large Fe-based bulk metallic glass specimens. AM fabricated specimens exceed the critical casting thickness of the material by a factor of 15 or more in all dimensions. Resulting microstructural and mechanical properties are reported. Despite decreasing quench effect with increasing build thickness, X-ray diffraction analysis suggests that a fully amorphous structure was maintained throughout the build. However, a low concentration of sparsely distributed nano-grain clusters was discovered using a high-resolution electron backscatter diffraction scan. The results pave the way for novel applications of metallic glasses achievable through appropriate material design and optimization of existing additive manufacturing processes. (C) 2018 Elsevier Ltd. All rights reserved.