Effect of Ti and Ta on the oxidation of a complex superalloy
Effect of Ti and Ta on the oxidation of a complex superalloy
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DOI：
10.1007/bf00603531
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发表时间：
1981-06
影响因子：
2.2
通讯作者：
Sherwin W. Yang
中科院分区：
文献类型：
--
作者：
Sherwin W. Yang
研究了一系列定向凝固镍基高温合金在1000和1100°C下的氧化行为。这些合金的成分为Ni-4.2Co-4.8Cr-12.8Al-1.6W3.1Mo-1.0Re（at.%），添加Ta和Ti。Ta和Ti以类似于Al的方式分配到合金相。%的Ta时，抗氧化性能显著提高，而1at. %的Ti似乎没有影响。将Ta和Ti的浓度提高到3at. %时，抗氧化性劣化，在3at. %的Ta。只有1在。%的Ta和Ti，两种合金建立了Al 2 O3的保护层。在3at. %的Ta和Ti的添加与保护性较差的复合氧化物的形成有关。使用X射线衍射和SEM的组合进行氧化物相的详细分析。在等温和循环条件下的氧化行为进行了表征。注意到在两种条件下获得的数据之间的差异。
The oxidation behaviors of a series of directionally solidified Ni-base superalloys were studied at 1000 and 1100°C. These alloys are based on a composition of Ni-4.2Co-4.8Cr-12.8Al-1.6W3.1Mo-1.0Re (at.%), with additions of Ta and Ti. Both Ta and Ti partition to alloy phases in a manner similar to Al. With addition of 1 at. % of Ta, the oxidation resistance is improved significantly, while 1 at. % of Ti appears to have no effect. Raising the concentration of Ta and Ti to 3 at. % degrades the oxidation resistance, the degradation is especially severe with 3 at. % of Ta. At only 1 at. % of Ta and Ti, both alloys establish a protective layer of Al2O3. The loss of the oxidation resistance at 3 at. % addition of Ta and Ti is related to the formation of complex oxides which are less protective. Detailed analysis of the oxide phases are conducted using a combination of X-ray diffraction and SEM. Characterizations of the oxidation behaviors are made under isothermal and cyclic conditions. The discrepancies between data obtained under both conditions were noted.