【摘要】 研究了具有均匀两相组织的粉末冶金Cu 2 5Cr和Cu 50Cr合金在 0 .1MPa纯氧气中的氧化。与组织不均的铸态Cu Cr合金相似 ,氧化后两种成分的粉末冶金Cu Cr合金均形成了复杂的混合氧化膜 ,但未形成连续的Cr2 O3层。而经机械合金化法获得的铬颗粒大小在 1 μm左右的Cu 2 0Cr合金 ,氧化时则形成了连续的Cr2 O3层。可见 ,在二元双相合金中 ,合金的氧化行为与合金的组织形态、大小和分布密切相关。更多还原

【Abstract】 The oxidation of Cu Cr alloys having uniform two phase microstructure and particle size of 30～40 μm prepared by powder metallurgy was studied. Both PM Cu 25Cr and PM Cu 50Cr alloys formed complex mixing scales rather than continuously external chromium oxide scale as as cast Cu Cr alloy. But a continuous Cr 2O 3 scale formed on the Cu 20Cr alloy having uniform two phase microstructure and average particle size of 1 μm prepared by mechanical alloying. This indicated that the oxidation behavior in two phase alloy can be deeply affected by the shape, size and spatial distribution of the two phase particles.更多还原