Abstract

Ni–33Al–34Cr and Ni–33Al–28Cr–6Mo (at %) eutectic alloys were produced by the resistive sintering (RS) technique using elemental powders. The cycle oxidation behaviors of alloys at 800, 900, and 1000°C for 168 h in air atmosphere were investigated. The oxidation resistance of alloys was evaluated by the weight change measurements. The activation energy for NiAl–34Cr and NiAl–28Cr–6Mo alloys was 57 and 31 kJ mol^–1, respectively. X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS) were performed to characterize the initial microstructure and the oxidation products. The obtained results showed that the oxidation products mainly consist of Cr₂O₃, α-Al₂O₃, NiO, and NiAl₂O₄ oxides.

中文翻译：

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NiAl-（Cr，Mo）共晶合金的生产及其在800-1000°C下的循环氧化行为

摘要

Ni–33Al–34Cr和Ni–33Al–28Cr–6Mo（at％）共晶合金是通过使用元素粉末的电阻烧结（RS）技术生产的。研究了合金在800、900和1000°C下在大气中168 h的循环氧化行为。通过重量变化测量来评估合金的抗氧化性。NiAl–34Cr和NiAl–28Cr–6Mo合金的活化能分别为57和31 kJ mol ^–1。进行了X射线衍射（XRD），扫描电子显微镜（SEM）和能量分散光谱（EDS），以表征初始微观结构和氧化产物。将所得到的结果表明，氧化产物主要由铬的₂ ö ₃，α-Al系₂ ö ₃，NiO和NiAl ₂ O ₄氧化物。