In this study, Ta–W–Ti–Al multialloys were prepared by spark plasma sintering (SPS) as a new powder metallurgy technology based on discharge activation and thermoplastic deformation process. The oxidation behavior of the as-obtained sintered alloys were investigated under 1000 and 1200°C in air atmosphere. Microstructures and phase compositions of alloys and oxides were analyzed using various analytical methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and backscatter electron microscopy (BSE). The sintered samples possessed relative densities reaching up to 98% with achievable densification. The densities of all specimens with high Ti contents exceeded 100%, suggesting the great impact of Ti addition on liquid-phase precipitation. Intermetallic compounds were formed in Ta–W–Al alloys, and samples with high Ti contents displayed grain boundary phases rich in titanium and oxygen. The addition of Ti and Al effectively improved the oxidation resistance of the resulting alloys. A protective alumina layer was formed after oxidation at 1000°C that made oxidation kinetics of the alloys obeying pseudo-parabolic laws. At the oxidation temperature of 1200°C, Al₂O₃ reacted with Ta₂O₅ to form the AlTaO₄ alloy with reduced protective effect. The mass gain in the alloys after oxidation at 1200°C for 4 h was about 7 times higher compared to processing at 1000°C.

在这项研究中，通过放电等离子体烧结（SPS）制备了Ta-W-Ti-Al多元合金，这是一种基于放电活化和热塑性变形工艺的新型粉末冶金技术。在空气气氛中，在1000和1200℃下研究了所得烧结合金的氧化行为。合金和氧化物的微观结构和相组成使用各种分析方法进行了分析，例如X射线衍射（XRD），配备能谱仪（EDS）的扫描电子显微镜（SEM）和背散射电子显微镜（BSE）。烧结后的样品具有相对密度，最高可达98％，并且可以实现致密化。所有高钛含量的样品的密度都超过了100％，这表明添加钛对液相沉淀有很大的影响。在Ta–W–Al合金中形成金属间化合物，并且高Ti含量的样品显示出富含钛和氧的晶界相。Ti和Al的添加有效地改善了所得合金的抗氧化性。在1000℃下氧化后形成保护性氧化铝层，其使合金的氧化动力学服从拟抛物线定律。在1200°C的氧化温度下₂ O ₃与Ta ₂ O ₅反应形成具有降低保护作用的AlTaO ₄合金。与在1000°C下处理相比，在1200°C下氧化4小时后，合金的质量增加了约7倍。