摘要
良好的结合界面对金属基复合材料的性能至关重要。利用液态搅拌法,制备了一种B4C强化的B4C/Al复合材料。通过添加Ti元素,探讨了界面反应对材料的界面结构和力学性能的影响。研究发现,通过B4C和Al熔体之间的界面反应,Ti元素大量聚集于B4C/Al界面处。B4C颗粒表面形成了一层致密且连续的纳米TiB2界面层,实现了界面改性。由于TiB2界面层具有良好的润湿性和结合状态,B4C/Al原有的界面缺陷消除了。随着界面反应程度的加强,材料强度逐渐提高。剧烈的界面反应会形成大量脱落的纳米TiB2颗粒进入基体。纳米TiB2颗粒作为原位第二强化相进一步增强基体。最后,探讨了不同程度界面改性后B4C/Al复合材料的断裂行为。
A fine bonded interface is essential for the property of metal matrix composites.A boron carbide reinforced aluminum composites(B4C/Al)was fabricated by liquid stirring technology.The effect of interfacial reaction on the microstructure and mechanical behavior of B4C/Al composites was explored by addition of Ti.The results show that through B4C-Al melt interfacial reaction,Ti element strongly enriches at the interface.A dense and continuous nanoscale layer of TiB2 forms on the surface of B4C particles.Interfacial modification is achieved by interfacial reaction.Since the formed TiB2 layer has good wettability and bonding,interfacial defects are eliminated.With the increasing of reaction degree,such as Ti content and reaction time,the strength of B4C/Al composites gradually improves.Severe interfacial reaction introduces lots of nano-scale Ti B2 crystals into the matrix,which as in situ second reinforcement also improves the strength of B4C/Al composites.Fracture behavior of B4C/Al composites with different interfacial modification was discussed at last.
作者
阮晴
贾玉振
郑继云
李丘林
刘伟
束国刚
Ruan Qing;Jia Yuzhen;Zheng Jiyun;Li Qiulin;Liu Wei;Shu Guogang(Tsinghua University, Beijing 100084,China;Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610041,China;Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055,China;China Nuclear Power Engineering Co. Ltd, Shenzhen 518055,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第6期1777-1784,共8页
Rare Metal Materials and Engineering
基金
Key Project of Shenzhen Science and Technology Innovation Committee(2013966003)
