阮晴,贾玉振,郑继云,李丘林,刘伟,束国刚.Ti 元素对B4C/Al复合材料力学性能的改善作用研究[J].稀有金属材料与工程,2019,48(6):1777~1784.[ruanqing,jiayuzhen,zhengjiyun,liqiulin,liuwei,shuguogang.Improvement on mechanical property of B4C/Al composites by addition of Ti through interfacial reaction[J].Rare Metal Materials and Engineering,2019,48(6):1777~1784.]
Ti 元素对B4C/Al复合材料力学性能的改善作用研究
投稿时间:2018-01-19  修订日期:2018-03-17
中文关键词:  碳化硼铝基复合材料    界面反应  力学性能
基金项目:
中文摘要:
      B4C/Al复合材料是目前最理想的中子吸收材料,广泛用于乏燃料储存。本文利用液态搅拌法制备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,Ti元素通过参与界面反应,改变了界面结构,在B4C颗粒表面形成了紧密结合的纳米TiB2界面层;Ti的添加消除了界面微裂纹、微孔、分离等缺陷。随着界面反应程度的加强,材料强度提高,尤其反应脱落的纳米TiB2颗粒作为原位第二强化相进一步增强基体。B4C/Al复合材料断裂过程表现为韧窝延性断裂;TiB2界面层增强了B4C颗粒与基体的结合,断裂行为从B4C-Al界面脱落转变为B4C颗粒断裂;但过渡的界面反应会形成微韧窝,引起材料延伸率下降。
Improvement on mechanical property of B4C/Al composites by addition of Ti through interfacial reaction
英文关键词:B4C/Al composites  Ti  Interfacial reaction  Mechanical property
英文摘要:
      A fine bonded interface is essential for the property of metal matrix composites. In this paper, an innovative method to strengthen boron carbide reinforced aluminum composites (B4C/Al composites) was studied by liquid stirring technology. The effect of interfacial reaction on the microstructure and mechanical behavior of B4C/Al composites was revealed by addition of Ti. Through B4C-Al melt interfacial reaction, Ti element strongly enriched at the interface. A dense and continuous nanoscale layer of TiB2 was formed on the surface of B4C particles. Interfacial modification was achieved by interfacial reaction. Due to the formation of TiB2 layer with good wettability and bonding, interfacial defects were eliminated. Increasing the degree of reaction, such as Ti content and reaction time, the strength of B4C/Al composites was gradually improved. Severe interfacial reaction introduced lots of nano-scale TiB2crystals into the matrix, which as in situ second reinforcement also improved the strength of B4C/Al composites. Fracture behavior of B4C/Al composites with different interfacial modification was discussed at last.
作者单位E-mail
阮晴 清华大学材料学院 zhengjiyun@aliyun.com 
贾玉振 中国核动力研究设计院  
郑继云 中国核动力研究设计院燃料及材料国家重点实验室 zhengjiyun@aliyun.com 
李丘林 清华大学深圳研究生院  
刘伟 清华大学材料学院  
束国刚 中广核工程有限公司  
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