含Mo的Ni_3Al－Fe基合金在900－1100℃空气中的氧化行为  

OXIDATION KINETICS OF MOLYBDENUM-CONTAINING Ni_3Al-Fe BASE ALLOY IN AIR AT 900-1100℃

作　　者：叶长江[1] 李铁藩[1] 郭建亭 沈嘉年[1] 

机构地区：[1]中国科学院金属腐蚀与防护研究所,腐蚀科学开放实验室

出　　处：《中国腐蚀与防护学报》1995年第2期100-104,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：国家863计划资助;国家自然科学基金

摘　　要：研究了含Ｍｏ的Ｎｉ３Ａｌ－Ｆｅ基合金在９００－１１００℃空气中的等温氧化行为，利用光学显微镜、ＳＥＭ、ＥＰＭＡ、ＸＲＤ分析了氧化膜的形态和结构．研究表明，含Ｍｏ的Ｎｉ３Ａｌ－Ｆｅ基合金由γ和β相组成．对应于γ相的氧化膜由多相组成，合金元素Ｆｅ和Ｍｏ使得γ相的氧化速率增大，氧化膜的粘附性和内聚力下降，其氧化反应激活能为４２．７ｋＪ／ｍｏｌ，Ｆｅ穿过Ａｌ２Ｏ３氧化层的扩散为氧化反应的速率控制步骤．而β相中的Ｆｅ和Ｍｏ，对其抗氧化性无不利影响，氧化膜仅由Ａｌ２Ｏ３．The isothermal oxidation behavior of molybdenum-containing Ni3Al-Fe base alloy was studied at 900-1100℃ in air. The structure and composition of the oxide scale were investigated by X-ray diffraction,scanning electron microscopy and electron microprobe analyzer etc. The reaction energy of oxidation wascalculated as 42.7kJ/mol. The microstructure of the alloy is composed of γ and β phases. The scale onγ phase was composed of several oxide layers, revealing crystallographic voids. Mo and Fe in γ phaseincreased the oxidation rate of Ni3Al and reduced the adhesion and cohesion of the oxide scale. It is shownthat the oxidation of γ phase followed a parabolic rate law, and unlike other Ni3Al alloy, its oxidationwas controlled by the diffusion of Fe in the oxide layer of Al2O3. The scale on β phase was composed of acontinuous, compact Al2O3 oxide layer, and Mo and Fe in the β phase is harmless to oxidation of β-NiAl.

关 键 词：Ni3Al-Fe 金属间化合物 抗氧化性 钼 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG172.3[金属学及工艺—金属材料]