Co-Al-W合金是一种由γ'-Co3(Al,W)相沉淀强化的新型钴基高温合金,为了研究微合金化元素钽对Co-8.8Al-9.8W(摩尔分数,％)合金强化相和高温氧化行为的影响,运用d电子合金设计理论和XRD分析方法研究Co-8.8Al-9.8W-xTa (x=0、0.5、1、1.5、2)合金的相组成、γ'强化相的数量及μ相的析出行为;运用SEM和EDAX等方法研究合金高温氧化膜的组成、显微组织结构和元素分布,并计算合金的氧化激活能.结果表明:钽元素含量增加,合金中γ'强化相的数量增多,对μ相析出的抑制程度增加.Co-8.8Al-9.8W-xTa合金的氧化膜主要由3层组成,最外层主要为钴的氧化物,中间过渡层为钨、铝和钽的复杂氧化物,最内层主要为铝的氧化物.钽元素提高合金氧化膜最内层中铝氧化物的致密性和稳定性.1.5Ta合金的氧化膜具有最佳的致密度和稳定性,氧化激活能最高,抗氧化能力最强.
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