Study of the interface and its effect on mechanical properties of continuous graphite fiber-reinforced 201 aluminum
| Autor: | Hamid Nayeb-Hashemi, J. Seyyedi |
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| Rok vydání: | 1989 |
| Předmět: | |
| Zdroj: | Metallurgical Transactions A. 20:727-739 |
| ISSN: | 2379-0180 0360-2133 |
| DOI: | 10.1007/bf02667590 |
| Popis: | The formation of fiber-matrix interfacial reaction zone and its impact on mechanical properties of Gr/201 Al composite (41 vol pct fiber) was evaluated in the as-received condition and after heat treatment in vacuum at 450°C, 500°C, and 545°C temperatures for one day, and at 545°C for one week. After heat treatment the microstructures of matrix and interface were studied by transmission electron microscopy. This study revealed the presence of interfacial constituents Al4C3, Al4O4C, and TiB2. The mean fiber-matrix reaction zone thickness showed an increase with increasing heat treatment temperature and time. The effects of heat treatment on interfacial shear strength, monotonic and cyclic tension/compression properties were evaluated. The results show that the interfacial shear strength not only depends on chemical reaction but also depends on the thickness of the reaction zone. An increase in reaction zone size reduces mechanical bonding considerably (thermal induced stresses). The growth of reaction zone was very detrimental to monotonic and cyclic tension/tension fatigue behavior. The mechanism of failure in tension/tension fatigue was the initiation of cracks at the interface and their subsequent propagation in the matrix. It was concluded that the reaction zone was the controlling factor in tension/tension fatigue. In contrast, the results showed that compressional fatigue was matrix dependent and was little sensitive to the size of the fiber/matrix interfacial reaction zone. |
| Databáze: | OpenAIRE |
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