High-temperature deformation of dispersion-strengthened cu-zr-ti-c alloys
| Autor: | M. Jesús Sayagués, M. Jesús Diánez, Rodrigo Palma, Rodrigo Espinoza, José M. Criado, Aquiles O. Sepúlveda |
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| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | MATERIALS SCIENCE & ENGINEERING. A, STRUCTURAL MATERIALS: PROPERTIES, MICROSTRUCTURE AND PROCESSING Artículos CONICYT CONICYT Chile instacron:CONICYT |
| Popis: | The hot mechanical behaviour and microstructure of Cu–5 vol.% TiC, Cu–5 vol.% ZrO2 and Cu–2.5 vol.% TiC–2.5 vol.% ZrO2 alloys prepared by reaction milling were studied. After a test of 1 h annealing at 1173 K, the Cu–5 vol.% ZrO2 alloy presented the lower softening resistance to annealing, while the other two ones kept their initial room-temperature hardness (about 2 GPa). Hot-compression tests at 773 and 1123 K, at initial true strain rates of 0.85 × 10−3 and 0.85 × 10−4 s−1 were performed. The Cu–2.5 vol.% TiC–2.5 vol.% ZrO2 and the Cu–5 vol.% ZrO2 alloys were the strongest and softest materials, respectively. Moreover, by electron microscopy, nanometric TiC and micrometric particles were detected in the Cu–5 vol.% TiC and Cu–5 vol.% ZrO2 alloys, respectively. A possible explanation for the observed behaviour of these materials is proposed. In the compression tests, it was also found that strain rate has a low effect on flow stress, as it has been previously observed by various authors in dispersion-strengthened alloys deformed at high temperatures. |
| Databáze: | OpenAIRE |
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