Kuang Zeyang, Xia Yixiao, Chen Guoqin, Sun Dongli, Ju Boyu, Wu Ping, Yang Wenshu, Wu Gaohui
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Materials (Basel). 2023 Jan 12;16(2):752. doi: 10.3390/ma16020752.
In this paper, two kinds of Be/2024Al composites were prepared by the pressure infiltration method using two different beryllium powders as reinforcements and 2024Al as a matrix. The effect of interfacial strength on the mechanical behavior of Be/2024Al composites was studied. Firstly, the microstructure and mechanical properties of the two composites were characterized, and then the finite element analysis (FEA) simulation was used to further illustrate the influence of interfacial strength on the mechanical properties of the two Be/2024Al composites. The mechanical tensile test results show that the tensile strength and elongation of the beryllium/2024Al composite prepared by the blocky impact grinding beryllium powder (blocky-Be/2024Al composite) are 405 MPa and 1.58%, respectively, which is superior to that of the beryllium/2024Al composite prepared by the spherical atomization beryllium powder (spherical-Be/2024Al composite), as its strength and elongation are 331 MPa and 0.38%, respectively. Meanwhile, the fracture of the former shows brittle fracture of beryllium particles and ductile fracture of aluminum, while the latter shows interface debonding. Further FEA simulation illustrates that the interfacial strength of the blocky-Be/2024Al composite is 600 MPa, which is higher than that of the spherical-Be/2024Al composite (330 MPa). Therefore, it can be concluded that the better mechanical properties of the blocky-Be/2024Al composite contribute to its stronger beryllium/aluminum interfacial strength, and the better interfacial strength might be due to the rough surface and microcrack morphology of blocky beryllium particles. These research results provide effective experimental and simulation support for the selection of beryllium powder and the design and preparation of high-performance beryllium/aluminum composites.
在本文中，以两种不同的铍粉为增强体、2024Al为基体，采用压力浸渗法制备了两种Be/2024Al复合材料。研究了界面强度对Be/2024Al复合材料力学行为的影响。首先，对两种复合材料的微观结构和力学性能进行了表征，然后利用有限元分析（FEA）模拟进一步阐明界面强度对两种Be/2024Al复合材料力学性能的影响。力学拉伸试验结果表明，采用块状冲击研磨铍粉制备的铍/2024Al复合材料（块状-Be/2024Al复合材料）的抗拉强度和伸长率分别为405MPa和1.58%，优于采用球形雾化铍粉制备的铍/2024Al复合材料（球形-Be/2024Al复合材料），后者的强度和伸长率分别为331MPa和0.38%。同时，前者的断裂表现为铍颗粒的脆性断裂和铝的韧性断裂，而后者表现为界面脱粘。进一步的FEA模拟表明，块状-Be/2024Al复合材料的界面强度为600MPa，高于球形-Be/2024Al复合材料（330MPa）。因此，可以得出结论，块状-Be/2024Al复合材料较好的力学性能得益于其较强的铍/铝界面强度，而较好的界面强度可能归因于块状铍颗粒的粗糙表面和微裂纹形态。这些研究结果为铍粉的选择以及高性能铍/铝复合材料的设计和制备提供了有效的实验和模拟支持。
