Epitaxial Growth and Stray Grain Control toward Single-Crystal Metallic Materials by Additive Manufacturing: A Review,Advanced Engineering Materials

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Epitaxial Growth and Stray Grain Control toward Single-Crystal Metallic Materials by Additive Manufacturing: A Review
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2023-03-14 , DOI: 10.1002/adem.202201917
Yang Liu ₁ , Jing Shi ₁

Affiliation

Additive manufacturing (AM) possesses tremendous potential in controlling epitaxial growth of deposited materials, and thus attempts have been made to employ AM technology to fabricate or repair single-crystal (SX) metal parts in recent years. One of the key issues in producing SX structures is the elimination of stray grain (SG) formation, but the layer-wise fabrication nature of AM processes makes SGs difficult to avoid. Herein, the state-of-the-art developments in this emerging research area are surveyed. It introduces the fundamental mechanisms of epitaxial growth in AM, summarizes the recent innovations and findings on using AM techniques to assist epitaxial growth and avoid SGs for SX metallic materials, discusses the relation of stray-grain avoidance and crack-free microstructure, and reviews the analytical and numerical modeling efforts for epitaxial growth and texture control. In addition, the challenges in achieving defect-free SX microstructure are discussed, such that future research directions are pointed out. It is believed that this critical review provides insights on microstructure control for AM-produced metallic materials and lays a solid foundation to stimulate more rigorous research.

中文翻译：

通过增材制造对单晶金属材料进行外延生长和杂散晶粒控制：综述

增材制造（AM）在控制沉积材料的外延生长方面具有巨大潜力，因此近年来人们尝试采用增材制造技术来制造或修复单晶（SX）金属零件。生产 SX 结构的关键问题之一是消除杂散晶粒 (SG) 的形成，但增材制造工艺的逐层制造性质使得杂散晶粒难以避免。本文调查了这一新兴研究领域的最新进展。介绍了增材制造外延生长的基本机制，总结了利用增材制造技术辅助外延生长并避免SX金属材料出现SG的最新创新和发现，讨论了杂散晶避免与无裂纹微观结构的关系，并回顾了外延生长和纹理控制的分析和数值建模工作。此外，还讨论了实现无缺陷SX微观结构的挑战，并指出了未来的研究方向。人们相信，这一批判性评论为增材制造金属材料的微观结构控制提供了见解，并为刺激更严格的研究奠定了坚实的基础。

更新日期：2023-03-14

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