姜昊,刘聪斌,马壮.原位自生TiB2/7075铝基复合材料组织及力学、摩擦磨损性能研究[J].精密成形工程,2025,17(5):132-142.
JIANG Hao,LIU Congbin,MA Zhuang.Microstructure, Mechanical Properties, Friction and Wear Properties of In-situ TiB2/7075 Aluminum Matrix Composites[J].Journal of Netshape Forming Engineering,2025,17(5):132-142. |
| 原位自生TiB2/7075铝基复合材料组织及力学、摩擦磨损性能研究 |
| Microstructure, Mechanical Properties, Friction and Wear Properties of In-situ TiB2/7075 Aluminum Matrix Composites |
| 投稿时间：2024-06-07 |
| DOI：10.3969/j.issn.1674-6457.2025.05.015 |
| 中文关键词: 原位自生 TiB2/7075铝基复合材料 微观组织 力学性能 摩擦磨损性能 |
| 英文关键词: in-situ synthesis TiB2/7075 aluminum matrix composite microstructure mechanical properties friction and wear property |
| 基金项目:河北省教育科学“十四五”规划2022年度立项课题(2205404) |
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| 中文摘要: |
| 目的 研究不同TiB2颗粒含量对7075铝合金微观组织及性能的影响。方法 以7075铝合金为基体材料，通过混合盐反应法制备了TiB2/7075铝基复合材料，采用光学显微镜(OM)、配有能谱分析仪(EDS)的扫描电子显微镜(SEM)及X射线衍射仪(XRD)等手段研究了不同TiB2颗粒含量的TiB2/7075铝基复合材料的微观组织及物相组成演变，借助电子万能试验机、维氏硬度计及摩擦磨损试验机探究TiB2颗粒含量对7075合金力学性能及摩擦磨损性能的影响。结果 原位自生TiB2颗粒对7075合金基体晶粒组织细化效果显著，粗大的树枝晶状结构转变为较细小的柱状晶或近球形非枝晶组织，TiB2颗粒均匀分布在晶界附近。当TiB2颗粒质量分数为2%时，TiB2/7075铝基复合材料的抗拉强度、屈服强度、伸长率及维氏硬度分别为501 MPa、412 MPa、7.8%和180.8HV。随着TiB2颗粒质量分数的不断增加，铝基复合材料的磨损率及摩擦因数均表现出先降低后增高的变化趋势。2%(质量分数)TiB2/7075铝基复合材料的磨损率及摩擦因数分别为9.33× 10−3 mm3/m和0.224，与7075合金基体相比，分别降低了44.3%和22.2%，由此可知，TiB2颗粒的存在有效提高了复合材料的耐磨性能。结论 通过原位自生反应生成的TiB2颗粒可以显著细化7075合金微观组织形貌，提高合金的性能，当TiB2颗粒质量分数为2%时，铝基复合材料的组织细化最为明显，力学性能及摩擦磨损性能最佳。 |
| 英文摘要: |
| The work aims to investigate the effect of different TiB2 particle content on the microstructure and properties of 7075 aluminum alloy. With 7075 aluminum alloy as matrix material, TiB2/7075 aluminum matrix composites were prepared by mixed salt reaction method. Optical microscope (OM), scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD) were used to study the microstructure and phase composition evolution of TiB2/7075 aluminum matrix composites with different TiB2 particle content. The effects of TiB2 particle content on the mechanical properties and friction and wear properties of 7075 alloy were investigated by electronic universal testing machine, Vickers hardness tester and friction and wear testing machine. The in-situ amorphous TiB2 particles had a significant effect on the refinement of the matrix grain structure of 7075 alloy. The coarse dendritic structure was transformed into a relatively fine columnar crystal or near-spherical non-dendritic structure, and the TiB2 particles were uniformly distributed near the grain boundary. When the mass fraction of TiB2 particles was 2%, the tensile strength, yield strength, elongation and Vickers hardness of TiB2/7075 aluminum matrix composites were 501 MPa, 412 MPa, 7.8% and 180.8HV, respectively. With the increasing mass fraction of TiB2 particles, the wear rate and friction coefficient of the aluminum matrix composites showed a trend of first decrease and then increase. The wear rate and friction coefficient of 2% TiB2/7075 aluminum matrix composites were 9.33×10−3 mm3/m and 0.224, respectively, which were 44.3% and 22.2% lower than those of the 7075 alloy matrix, respectively. Therefore, it could be seen that the existence of TiB2 particles effectively improved the wear resistance of the composites. In conclusion, the generation of TiB2 particles through in-situ synthesis can significantly refine the microstructure and improve the performance of 7075 alloy. When the TiB2 particle content is 2%, the microstructure refinement of aluminum matrix composites is most significant, and the mechanical and friction wear properties are the best. |
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