Formation of Secondary Reaction Zones in Diffusion Aluminide-Coated Ni-Base Single-Crystal Superalloys Containing Ruthenium
Formation of Secondary Reaction Zones in Diffusion Aluminide-Coated Ni-Base Single-Crystal Superalloys Containing Ruthenium
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DOI：
10.1007/s11661-008-9534-1
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发表时间：
2008-04
期刊：
影响因子：
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通讯作者：
D. Das;K. Murphy;Shuwei Ma;T. Pollock
中科院分区：
文献类型：
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作者：
D. Das;K. Murphy;Shuwei Ma;T. Pollock
研究了几种含Ru单晶镍基高温合金中铝化物涂层下二次反应区的形成。在高温合金中存在显著量的Ru并不能阻止二次反应区的形成。然而，Ru含量的合金的影响类型的难熔元素丰富的相形成过程中的转变。随着Ru含量的增加，相变所涉及的相由正交相P转变为β-RuAl相。在合金的枝晶和枝晶间区域之间观察到SRZ形成的差异趋势。在高温氧化过程中，也观察到显着增长的SRZ涂层合金。讨论了合金元素对SRZ形成的影响。
The formation of secondary reaction zones (SRZs) beneath aluminide coatings in several Ru-bearing single-crystal Ni-base superalloys has been investigated. The presence of significant amounts of Ru in the superalloys did not prevent the formation of the secondary reaction zone. However, the Ru content of the alloys affected the type of refractory element-rich phase formed during the transformation. As the Ru content increased, the phase involved in the transformation shifted from the orthorhombic P to theβ-RuAl phase. A differential tendency to SRZ formation was observed between the dendritic and interdendritic regions of the alloys. Significant growth of the SRZ was also observed during the high-temperature oxidation exposure of the coated alloys. The effects of the alloying elements on SRZ formation are discussed.