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基于同步辐射与第一性原理计算的 Al/Cu 钎焊界面组织与接头性能研究
Study of the Interfacial Microstructures and Properties at the Al/Cu Brazing Joints by Using Synchrotron Radiation and First-principles Calculations
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- DOI:
- 作者:
- 杨俊朝 1 ，黄 冠 1 ，丁宗业 1，2，3 ，纠永涛 3 ，龙伟民 3 ，胡侨丹 2
YANG Junchao1 , HUANG Guan1 , DING Zongye1,2,3, JIU Yongtao3 , LONG Weimin3 , HU Qiaodan2
- 作者单位:
- 1. 佛山科学技术学院 机电工程与自动化学院，广东 佛山 528225；2. 上海交通大学 材料科学与工程学院，上海 315700；3. 郑州机械研究所有限公司 新型钎焊材料与技术国家重点实验室，河南 郑州 450001
1. Sohool of Machatronic Engireering and Automation, Foshan University, Foshan 528225, China; 2. Sohool of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 315700, China; 3. Zhengzhou Machinery Research Institute Co., Ltd., State Key Laboratory of Advanced Brazing Filler Metals and Technology, Zhengzhou 450001, China
- 关键词:
- Al/Cu 钎焊；同步辐射；第一性原理计算；化合物；力学性能
Al/Cu brazing; synchrotron radiation; first-principles calculations; compounds; mechanical properties
- 摘要:
- 界面脆性化合物对 Al/Cu 钎焊接头力学性能影响显著，明晰界面化合物的形成、生长行为与块体性质对调控界面组织与接头性能至关重要。本文借助同步辐射 X 射线成像技术对加热与冷却过程中 Al/Cu 钎焊界面组织演变进行动态表征，利用第一性原理计算对界面化合物的块体性质进行计算，研究了界面化合物的形成次序、模量与键合特 征。 结果表明，界面 Al2Cu 与 Al4Cu9 化合物在冷却过程中形成，小平面枝晶状 Al2Cu 化合物为初生相，从原始界面处凝 固析出，且二次枝晶臂呈非对称性；与母材接触后发生扩散反应形成层状 Al4Cu9 化合物。界面化合物具有金属键与共价键的混合键合特征，Al4Cu9 化合物具有较高的结合能、体积弹性模量、剪切模量、杨氏模量与硬度，可提高 Al/Cu 钎焊接头硬度，降低塑韧性。Interfacial brittle compounds strongly affect the mechanical properties of Al/Cu brazing joints. It is important to determine the formation, growth behavior and bulk properties of interfacial compounds to further control the interfacial microstructures and properties of joints. In this paper, synchrotron radiation X-ray imaging was used to dynamically characterize the interfacial reactions at Al/Cu brazing joints, and first-principles calculations were subsequently performed to calculate the bulk properties of the interfacial compounds. The formation sequence, modulus and bonding characteristics of the compounds were investigated. The results show that layered Al4Cu9 and faceted and dendritic Al2Cu compounds form during cooling. The faceted and dendritic Al2Cu compound is the primary phase and precipitates at the original interface, exhibiting the characteristics of asymmetric secondary dendrite arms. After the Al2Cu compound contacts the base metal, the Al2Cu compound reacts with the base metal to form the Al4Cu9 compound. The interfacial compounds exhibit mixed bonding characteristics, including metallic and covalent bonding. Compared to those of the Al2Cu compound, the Al4Cu9 compound has a greater cohesive energy, bulk modulus, shear modulus, Young's modulus and hardness, enhancing the hardness of the joints and decreasing their toughness and plasticity.