Different Effects of Nano-Crystallization on High-Temperature Oxidation Behavior of Cu–Si and Fe–Si Alloys
The effect of nano-crystallization on the oxidation behavior was examined in 0.1 MPa pure oxygen at different temperatures for two Fe–0.5Si and two Cu–1.0Si alloys prepared by CC (conventional casting) and MA (mechanical alloying). The grain sizes of both MA Fe–00.5Si and MA Cu–1.0Si alloys are about 50 nm, while the grain sizes of both CC Fe–0.5Si and CC Cu–1.0Si alloys are larger than 200 μm. After 24 h oxidation, the oxide scales were examined by XRD, SEM and EDX. The results show that from the outermost layer to the innermost layer, the Fe–0.5Si alloys formed complex scales, consisting of Fe2O3→Fe3O4+FeO→FeO→FeO+SiO2, and the Cu–1.0Si alloys formed scales of CuO→Cu2O→Cu2O+SiO2→internal oxidation zone. From the oxidation kinetics it is shown that nano-crystallization reduces the oxidation resistance of the Fe–0.5Si alloy but improves the oxidation resistance of the Cu–1.0Si alloy. The effect of nano-crystallization on the oxidation has two aspects: positive impact and negative impact. Whether nano-crystallization can improve the high-temperature oxidation resistance of alloys is determined by which of the two aspects predominates.
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Document Type: Research Article
Publication date: 01 December 2010
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