Oxidation of two-phase Cu-Cr alloy swith different microstructures

来源期刊：中国有色金属学报(英文版)2001年第3期

论文作者：付广艳 牛焱 吴维tao 管恒荣

文章页码：333 - 336

Key words：oxidation; Cu-Cr alloys; powder metallurgy; mechanical alloying; sputtering

Abstract: The oxidation of PM Cu-50Cr, MA Cu-40Cr and MS Cu-40Cr alloys at 800 ℃ in 0.1 MPa O₂ was studied. The most important difference of their oxidation behaviors is the formation of an exclusive chromia scale on the surface of the MS Cu-40Cr alloy and a continuous chromia layer beneath an outer CuO layer corresponding MA Cu-40Cr alloy, while a complex scale composing of CuO, Cu₂O, Cu₂Cr₂O₄ and Cr₂O₃formed on the PM Cu-50Cr alloy. This result implies that alloy microstructure affects their oxidation behaviors largely. Microcrystalline structure provides numerous diffusion paths for reactive component chromium, shorter diffusion distance and rapid dissolution of Cr-riched second phase. All these favor the exclusive formation of the most stable oxide.