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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of Ta on microstructure and phase distribution in cyclic oxidized Ir-Ta modified aluminide coatings on nickel base single crystal superalloy
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Effect of Ta on microstructure and phase distribution in cyclic oxidized Ir-Ta modified aluminide coatings on nickel base single crystal superalloy

机译：Ta对镍基单晶高温循环氧化Ir-Ta改性铝化物涂层微观结构和相分布的影响

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摘要

The effect of Ir-Ta coating (with varying amounts of Ta) on microstructure, composition variation and phase distribution in the modified aluminides on Ni-base single crystal superalloy, TMS-75 subjected to cyclic oxidation has been investigated. Ir-Ta coatings with Ta = 14.1, 23.1, 40.7 and 82.9 at.% deposited on < 100 > oriented nickel base single crystal superalloy, TMS-75 were aluminized and subjected to cyclic oxidation at 1373 K, for 600 h. The mass gain as a function of number of cycles data demonstrates an improved oxidation resistance with decreasing Ta content. In contrary to Ta-rich aluminides, Ir-rich aluminides show a large volume fraction of the β-phase, a less amount of γ'-Ni_3Al phase near the surface of the coatings. Rapid decrease in the concentration of Al in the diffusion zone and formation of interconnected γ'-Ni_3Al has been found to be responsible for the lower oxidation resistance of Ta-rich aluminides.
机译：研究了Ir-Ta涂层（具有不同的Ta量）对镍基单晶高温合金TMS-75进行循环氧化后的改性铝化物的微观结构，组成变化和相分布的影响。将Al沉积在<100>取向的镍基单晶高温合金TMS-75上的Ta = 14.1、23.1、40.7和82.9 at。％的Ir-Ta涂层进行铝化处理，并在1373 K下进行600 h的循环氧化。作为循环数数据的函数的质量增益表明，随着Ta含量的降低，抗氧化性得到了改善。与富含Ta的铝化物相反，富含Ir的铝化物在涂层表面附近表现出较大的β相体积分数，较少的γ'-Ni_3Al相。已经发现，扩散区中Al浓度的快速下降和相互连接的γ'-Ni_3Al的形成是造成富含Ta的铝化物的较低抗氧化性的原因。

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