Wang Haoran, Zhao Shuo, Han Junqing, Wu Yuying, Liu Xiangfa, Wei Zuoshan
Key Laboratory of Liquid-Solid Structure Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China.
Shandong Key Laboratory of Advanced Aluminum Materials and Technology, Binzhou Institute of Technology, Binzhou 256600, China.
Materials (Basel). 2023 Feb 8;16(4):1443. doi: 10.3390/ma16041443.
Copper has high electrical and thermal conductivity, which is frequently employed in structural and functional materials. In this research, powder metallurgy was used to incorporate boron nanosheets into metal matrix composites to create boron dispersion-enhanced copper matrix composites. The neutron-absorption characteristics of composite materials were investigated, as well as the link between neutron-absorption cross-section and neutron energy. The results told us that the morphology of the second phase on the particle surface is closely related to the size of Cu-B particles, copper and boron correspond atomically to each other on the interface without dislocation or lattice distortion, forming a completely coherent interface, and that the neutron absorption cross-section decreases exponentially as neutron energy increases. In low-energy neutrons with energies less than 0.1 eV, the increase of boron content and B abundance in Cu-B alloy will enhance the neutron-absorption capacity of the alloy. Boron dispersion-strengthened copper matrix composites have good neutron-absorption capacity, and the microstructure and size of boron do not affect the neutron-absorption performance of composites with the same content of boron. The hardness of the B-dispersion-strengthened Cu matrix composite obtained by nanoindentation test is about 3.04 GPa. Copper matrix composites with boron dispersion reinforcement exhibit high hardness and neutron-absorption characteristics.
铜具有高导电性和导热性，常用于结构材料和功能材料。在本研究中，采用粉末冶金法将硼纳米片掺入金属基复合材料中，以制备硼弥散强化铜基复合材料。研究了复合材料的中子吸收特性，以及中子吸收截面与中子能量之间的关系。结果表明，颗粒表面第二相的形貌与Cu-B颗粒尺寸密切相关，铜和硼在界面处原子相互对应，无位错或晶格畸变，形成完全共格界面，且中子吸收截面随中子能量增加呈指数下降。在能量小于0.1 eV的低能中子中，Cu-B合金中硼含量和B丰度的增加会提高合金的中子吸收能力。硼弥散强化铜基复合材料具有良好的中子吸收能力，且硼的微观结构和尺寸不影响相同硼含量复合材料的中子吸收性能。通过纳米压痕试验得到的B弥散强化Cu基复合材料的硬度约为3.04 GPa。具有硼弥散强化的铜基复合材料表现出高硬度和中子吸收特性。
