基于熔体控速滴铸法制备分米级高纯镁单晶的工艺探索-中国材料进展

文章信息/Info

Title:: Exploration of Decimeter-Sized High-Purity Magnesium Single Crystal Preparation Based on Melt Controlled-Speed Drop Casting

作者:: 刘博宇; 黄鑫垚; 马欣金; 郑芮; 李峣峰; 李玖章; 肖鹏; 单智伟; 1. 西安交通大学金属材料强度国家重点实验室，陕西西安 710049 2. 西安交通大学陕西省镁基新材料工程研究中心，陕西西安 710049 3. 西安交通大学材料科学与工程学院，陕西西安 710049

Author(s):: LIU Boyu; HUANG Xinyao; MA Xinjin; ZHENG Rui; LI Yaofeng; LI Jiuzhang; XIAO Peng; SHAN Zhiwei; 1.State Key Laboratory for Mechanical Behavior of Materials，Xi’an Jiaotong University，Xi’an 710049，China 2.Engineering Research Center for Magnesium-Based New Materials，Xi’an Jiaotong University，Xi’an 710049，China et al.

Keywords:: high-purity magnesium; single crystal; melt controlled-speed drop casting; crystal growth

摘要:: 金属镁具有密排六方晶体结构，其力学性能和物理化学性能具有明显的各向异性。高纯镁单晶是研究镁沿不同晶向的力学性能、腐蚀行为及导电导热等物理化学性能的理想材料。目前，高纯镁单晶常需进口，其价格昂贵，购买手续繁琐，且所能购置的单晶尺寸一般为厘米级甚至更小，难以满足批量化的力学和物理性能测试需求。提出了一种基于熔体控速滴铸法的高纯镁单晶生长方法，并探索了原料纯度、结晶坩埚结构及温度设置等因素对晶体生长的影响规律。应用该方法及装置，成功制备了纯度为9999%（质量分数）的分米级尺寸高纯镁单晶体。

Abstract:: Magnesium has a hexagonal close-packed (hcp) crystal structure, thus its mechanical and physical/chemical properties exhibit significant anisotropy along variant crystallographic orientations. High-purity magnesium single crystal is an ideal material for studying the mechanical properties, corrosion resistance, electrical and thermal conductivity, and other physical/chemical properties of magnesium along different crystallographic orientations. However, high-purity magnesium single crystals often need to be imported, which are expensive, and the purchase procedures are complicated and timeconsuming. Moreover, the size of magnesium single crystal produced by current methods is generally with centimeter or even smaller. The present paper proposes a method for growing high-purity magnesium single crystals based on melt controlled-speed drop casting method. The effects such as raw material purity, crucible configuration, and temperature setting on crystal growth are studied. Using the proposed method, decimeter-sized high-purity magnesium single crystals with a purity of 99.99wt% are successfully produced.