Interparticle bonding and interfacial nanocrystallization mechanisms in additively manufactured bulk metallic glass fabricated by cold spray
Interparticle bonding and interfacial nanocrystallization mechanisms in additively manufactured bulk metallic glass fabricated by cold spray
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DOI：
10.1016/j.addma.2022.103057
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发表时间：
2022-07
影响因子：
11
通讯作者：
Ningsong Fan;Chunjie Huang;Zhong-Hua Wang;Pengfei Yu;Wen Chen;R. Lupoi;Q. Xie;Lin Liu;Shuo Yin
中科院分区：
文献类型：
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作者：
Ningsong Fan;Chunjie Huang;Zhong-Hua Wang;Pengfei Yu;Wen Chen;R. Lupoi;Q. Xie;Lin Liu;Shuo Yin
采用冷喷涂添加剂法制备了非晶态锆基大块非晶金属玻璃。通过研究沉积后单个颗粒的变形行为，系统地研究了金属玻璃颗粒的结合机理。揭示了导致金属玻璃沉积的两种集体颗粒结合机制，即高速冲击诱导界面边缘的局域冶金结合和高颗粒温度引起的粘度降低以及由此产生的环形冶金结合带。此外，还详细研究了冷喷涂过程中严重变形界面区非晶相向纳米晶结构的动态演化机制。首次在冷喷涂金属玻璃中观察到了不同的非晶/纳米晶结构，它们代表了纳米晶化过程中的不同演化阶段。根据观察结果推测，纳米晶化过程可分为三个阶段：成分偏析、有序一维和二维过渡结构的形成以及三维纳米晶的形成。目前的研究为冷喷涂大块金属玻璃涂层的结合机制和纳米晶化机制提供了新的见解。
Amorphous Zr-based bulk metallic glass deposit was produced by cold spray additive manufacturing. The bonding mechanism of metallic glass particles was systematically investigated through studying the deformation behavior of individual particles after deposition. We revealed two collective particle bonding mechanisms that contributed to the formation of metallic glass deposits, i.e., high-velocity impact induced localized metallurgical bonding at the fringe of the interface, and high particle temperature induced viscosity reduction and the resultant annular metallurgical bonding band. Moreover, the dynamic evolution mechanism of the amorphous phase into nanocrystal structures at severely deformed interfacial regions during cold spray was carefully investigated. For the first time, we observed different amorphous/nanocrystal structures in cold sprayed metallic glass deposits, which can represent different evolution stages in nanocrystallization process. Based on the observation, it is inferred that the nanocrystallization process can be divided into following three stages: composition segregation, the formation of ordered 1D and 2D transition structures, and 3D nanocrystals. The current study provides new insights into the bonding mechanisms and the mechanistic nanocrystallization origins in cold sprayed bulk metallic glass deposits.