Different Effects of Nano-Crystallization on High-Temperature Oxidation Behavior of Cu-Si and Fe-Si Alloys
Authors: Su, Yong; Fu, Guangyan; Liu, Qun
Source: Advanced Science Letters, Volume 3, Number 4, December 2010 , pp. 500-506(7)
Publisher: American Scientific Publishers
Abstract: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.
Document Type: Research article
Publication date: 2010-12-01
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