激光立体成形锆基块体非晶合金的组织特征  

Structural Characteristics of Laser Solid Forming Zr-Based Bulk Metallic Glass

作　　者：张莹[1] 林鑫[1] 杨高林[1] 胡桥[1] 杨海欧[1] 李鹏 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]陕西省摩擦焊接工程技术重点实验室,陕西西安710072

出　　处：《中国激光》2013年第3期86-91,共6页Chinese Journal of Lasers

基　　金：国家973计划(2011CB610402);国家自然科学基金(50971102);高等学校博士学科点专项科研基金(20116102110016);高等学校学科创新引智计划(08040)资助课题

摘　　要：以商用纯锆为基材,采用激光立体成形技术分别沉积了单层和多层Zr55Al10Ni5Cu30非晶合金,并对沉积层及其基体界面区域的成分和组织结构进行了分析。结果表明,沉积层主要由非晶构成,晶化程度随着沉积层数的增加无显著增加;沉积层的晶化主要存在于每一层的热影响区,近层间和道间搭接部分晶化最为严重,并且层间的晶化比道间的更显著;沉积层与基体的结合方式为冶金结合,在基体和沉积层间存在一薄层过渡区,其最大厚度仅为35μm,基体的成分稀释主要发生在此过渡区,并在过渡区出现了局部外延枝晶生长。Single layer and multilayer Zr55Al0NisCu30 bulk metallic glasses are deposited on the commercial pure zirconium substrates by laser solid forming （LSF）. The composition and microstructure of the deposits are researched. The results show that the deposits are mainly constituted by amorphous materials. The crystallization degree does not increase remarkably with the increase of deposited layers. The crystallization mainly occurs in the overlapping zone between the adjacent traces and layers of the heat affected zone （HAZ）, especially the adjacent layers. The bonding type between deposit and substrate is metallurgy bonding. There is epitaxial growth of dendrites emerging at the thin transition zone which is only 35 tam, the composition dilution mainly occurs in this transition zone,

关 键 词：材料 非晶合金 激光立体成形 过渡层 

分 类 号：TN249[电子电信—物理电子学]