Effect of basalt fibers on the structure and mechanical properties of AK12 aluminum alloy
In this paper, a study of the effect of basalt fibers on the structure and mechanical properties of AK12 (Al-Si-Mg) cast aluminum alloy is performed. The main purpose is to increase the strength characteristics of the alloy using dispersed reinforcement and intensification of crystallization. The composite material was obtained by introducing 1 wt.% of basalt fibers followed by ultrasonic treatment of the melt (17-22 kHz) and vibration casting (60 Hz), which ensured the uniform distribution of the reinforcing particles and modification of the microstructure. Metallographic analysis showed a decrease of defectiveness and variation in the morphology of the intermetallic phases, as well as the formation of the hexagonal phase Al₁₂(Fe,Mn)₃Si instead of the skeletal Al₁₅(Fe,Mn)₃Si₂ due to the presence of calcium in the composition of the fibers. At the same time, the average size of dendritic cells was 38 ± 3 pm. Mechanical tests revealed an increase in tensile strength from 186 to 232 MPa and in elongation from 2.8 to 3.5 %, as well as an increase in Brinell hardness and Vickers microhardness by 1520 %. Fractographic analysis confirmed the transition from a purely brittle to a quasi-brittle-plastic fracture mechanism. The obtained results indicated the efficiency of basalt fibers as a strengthening additive and their promise for the development of aluminum composite materials with improved performance properties.
Keywords
composite materials,
aluminum alloy,
basalt fibers,
АК12,
reinforcementAuthors
| Valikhov Vladimir D. | Tomsk State University | valihov.snobls@yandex.ru |
| Khrustalyov Anton P. | Tomsk State University | tofik0014@gmail.com |
| Zhukov Il’ya A. | Tomsk State University | gofra930@gmail.com |
| Vorozhtsov Aleksandr B. | Tomsk State University | abv1953@mail.ru |
Всего: 4
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