Printability of Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 metallic glass on steel by laser additive manufacturing: A single-track study
Printability of Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 metallic glass on steel by laser additive manufacturing: A single-track study
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DOI：
10.1016/j.surfcoat.2021.127882
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发表时间：
2021-11
影响因子：
5.4
通讯作者：
Shengbiao Zhang;Peijun Hou;Shahryar Mooraj;Wen Chen
中科院分区：
文献类型：
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作者：
Shengbiao Zhang;Peijun Hou;Shahryar Mooraj;Wen Chen
金属玻璃(MGs)的非晶态结构赋予了它们特殊的性质。镁合金的形成需要足够高的冷却速度才能绕过结晶，这导致传统工艺(如铸造)限制了镁合金的尺寸。激光添加制造(LAM)技术具有高凝固速率的特点，为大规模制造金属基复合材料提供了可能性。本工作通过高通量激光单道熔炼实验，研究了高密度、微晶化的Zr41.2Ti13.8Cu12.5Ni10.0Be22.5(at.%)MG的LAM工艺窗口。在不同的激光加工参数组合下，我们观察到了不同类型的单道特征，包括开裂、未熔合和部分结晶。为了理顺金属基复合材料熔化过程中的工艺-结构关系，采用有限元热模拟方法对熔池内的瞬时温度演变和局部冷却速率进行了监测。我们的工作为LAM协议的优化提供了重要的见解，以在不同的晶体材料上实现完全非晶态、结合良好和致密的MG涂层。
The amorphous structure of metallic glasses (MGs) endows them with extraordinary properties. Formation of MGs requires sufficiently high cooling rates to bypass crystallization, which results in their limited sizes by conventional processing routes such as casting. Laser additive manufacturing (LAM) technique is featured by high solidification rate that provides the potential for scalable fabrication of MGs. In this work, through high throughput laser single-track melting experiments, we studied the LAM processing window of a Zr41.2Ti13.8Cu12.5Ni10.0Be22.5(at.%) MG to achieve materials with near-full density and minimal crystallization. We observed different types of single-track features including cracking, lack-of-fusion, and partial crystallization under different combinations of laser processing parameters. To rationalize the processing-structure relationships during LAM of MGs, finite-element thermal modeling was performed to monitor the transient temperature evolution and site-specific cooling rate in the melt pool. Our work provides significant insight into the LAM protocol optimization towards fully amorphous, well-bonded, and dense MG coatings on dissimilar crystalline materials.