当前位置: X-MOL 学术Intermetallics › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Hybrid reinforced aluminum matrix composites fabricated by selective laser melting
Intermetallics ( IF 4.4 ) Pub Date : 2021-01-13 , DOI: 10.1016/j.intermet.2020.107080
Hailong Liao , Wenqi Zhang , Changpeng Chen , Baijin Chen , Gang Xue , Haihong Zhu

In this work, near full density and crack-free hybrid aluminum matrix composites (HAMCs) reinforced with Cr3C2 ceramic particles and Ni–Cr trace elements were successfully fabricated by selective laser melting (SLM). The phase structure, microstructure, mechanical properties and strengthening mechanism of HAMCs were investigated. The results show that various intermetallic compounds, such as Al13Cr2, Al11Cr2 and Al3Ni etc. are generated in HAMCs for the incorporation of trace elements Ni and Cr. These hard-intermetallic compounds provide significant precipitation strengthening effect. Moreover, additions of Cr exert a solid solution strengthening effect because of its good solubility in Al. For the Cr3C2 ceramic, the load transfer from matrix to the reinforcing particles plays an important role on strengthening metal matrix composites. And acicular Al4C3 is formed at the interface between Cr3C2 and the matrix, which improves the interface bonding strength. With various positive strengthening mechanisms, the microhardness of HAMCs increases by 32% and the compressive strength increase by 22%. HAMCs exhibit excellent compressive strength. However, a significant reduction (26%) in tensile properties was found because the crack in the ceramic particle is more sensitive to tensile stress than compressive stress. Micro-particles Cr3C2 are the source of fracture failure of the tensile sample.



中文翻译:

选择性激光熔融制备混杂增强铝基复合材料

在这项工作中,通过选择性激光熔化(SLM)成功地制造了由Cr 3 C 2陶瓷颗粒和Ni-Cr痕量元素增强的接近全密度和无裂纹的混合铝基复合材料(HAMC )。研究了HAMC的相结构,微观结构,力学性能和增强机理。结果表明,各种金属间化合物如Al 13 Cr 2,Al 11 Cr 2和Al 3在HAMC中会生成Ni等,以引入痕量元素Ni和Cr。这些硬金属间化合物具有明显的沉淀增强作用。此外,Cr的添加由于其在Al中的良好溶解性而发挥固溶强化作用。对于Cr 3 C 2陶瓷,从基体到增强颗粒的载荷转移在增强金属基复合材料方面起着重要作用。并且在Cr 3 C 2之间的界面处形成针状Al 4 C 3。和基质,提高了界面粘合强度。通过各种积极的强化机制,HAMC的显微硬度提高了32%,抗压强度提高了22%。HAMC具有出色的抗压强度。然而,由于陶瓷颗粒中的裂纹对拉伸应力比对压缩应力更敏感,因此发现拉伸性能显着降低(26%)。Cr 3 C 2微粒是拉伸样品断裂破坏的根源。

更新日期:2021-01-13
down
wechat
bug