X-ray Imaging of Alloy Solidification: Crystal Formation, Growth, Instability and Defects.
X-ray Imaging of Alloy Solidification: Crystal Formation, Growth, Instability and Defects.
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合金凝固的X射线成像：晶体形成、生长、不稳定性和缺陷
DOI：
10.3390/ma15041319
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发表时间：
2022-02-10
期刊：
影响因子：
--
通讯作者：
Grant PS
中科院分区：
文献类型：
--
作者：
Feng S;Liotti E;Grant PS
同步加速器和基于实验室的X射线成像技术越来越多地用于合金凝固及其他金属加工过程的原位研究。近年来已经发表了一些综述，重点关注用于金属凝固研究的原位X射线成像技术的发展。相反，本文全面综述了原位X射线成像所提供的知识，以增进对凝固理论和新兴金属加工技术的理解。我们首先回顾了通过原位X射线成像获得的与晶体成核和生长机制相关的见解，包括α - Al和金属间化合物晶体的溶质抑制成核理论、α - Al的枝晶生长以及富Fe的刻面金属间化合物的孪晶面再入生长机制。其次，我们讨论了原位X射线研究在理解微观结构不稳定性方面的贡献，包括溶质驱动引起的枝晶破碎、枝晶根部重熔、平面固/液界面的不稳定性、胞状 - 枝晶转变以及柱状 - 等轴转变。第三，我们综述了近平衡凝固过程中缺陷形成机制的研究，包括孔隙和热裂的形成以及相关的液态金属流动。然后，我们讨论了X射线成像如何应用于对远离平衡的新兴金属加工过程（如增材制造）的理解和开发。最后，对未来的研究机会和挑战进行了展望。
Synchrotron and laboratory-based X-ray imaging techniques have been increasingly used for in situ investigations of alloy solidification and other metal processes. Several reviews have been published in recent years that have focused on the development of in situ X-ray imaging techniques for metal solidification studies. Instead, this work provides a comprehensive review of knowledge provided by in situ X-ray imaging for improved understanding of solidification theories and emerging metal processing technologies. We first review insights related to crystal nucleation and growth mechanisms gained by in situ X-ray imaging, including solute suppressed nucleation theory of -Al and intermetallic compound crystals, dendritic growth of -Al and the twin plane re-entrant growth mechanism of faceted Fe-rich intermetallics. Second, we discuss the contribution of in situ X-ray studies in understanding microstructural instability, including dendrite fragmentation induced by solute-driven, dendrite root re-melting, instability of a planar solid/liquid interface, the cellular-to-dendritic transition and the columnar-to-equiaxed transition. Third, we review investigations of defect formation mechanisms during near-equilibrium solidification, including porosity and hot tear formation, and the associated liquid metal flow. Then, we discuss how X-ray imaging is being applied to the understanding and development of emerging metal processes that operate further from equilibrium, such as additive manufacturing. Finally, the outlook for future research opportunities and challenges is presented.
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DOI：
10.1016/0001-6160(75)90127-3
发表时间：
1975-01-01
期刊：
ACTA METALLURGICA
影响因子：
--
作者：
ADAM, CM;HOGAN, LM
通讯作者：
HOGAN, LM
影响因子：
9.4
作者：
Abou-Khalil, L.;Salloum-Abou-Jaoude, G.;Nguyen-Thi, H.
通讯作者：
Nguyen-Thi, H.
影响因子：
6
作者：
Agarwal, G.;Amirthalingam, M.;Hermans, M. J. M.
通讯作者：
Hermans, M. J. M.
影响因子：
6
作者：
Feng, S.;Cui, Y.;Grant, P. S.
通讯作者：
Grant, P. S.
影响因子：
3.4
作者：
Bobel, Andrew;Hector, Louis G., Jr.;Sun, Tao
通讯作者：
Sun, Tao