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TGO and Al diffusion behavior of CuAlxNiCrFe high-entropy alloys fabricated by high-speed laser cladding for TBC bond coats
Corrosion Science ( IF 8.3 ) Pub Date : 2021-09-06 , DOI: 10.1016/j.corsci.2021.109781
Qing-Long Xu 1 , Kang-Cheng Liu 1 , Ke-Yan Wang 1 , Li-Yan Lou 1, 2 , Yu Zhang 1 , Chang-Jiu Li 1 , Cheng-Xin Li 1
Affiliation  

CuAlxNiCrFe (x = 0.5, 1, 1.5, 2) high-entropy alloys (HEAs) with good high-temperature oxidation resistance were deposited as bond coats via high-speed laser cladding. The microstructure of the CuAlxNiCrFe bond coats exhibited the columnar-to-equiaxed grain transition with increasing Al content. All bond coats generated a uniform and dense aluminum oxide layer and exhibited a low thermally grown oxide (TGO) growth rate after 100 h of oxidation at 1100 °C. During oxidation, CuAl1.5NiCrFe exhibited an extremely low Al diffusion coefficient, and the grain size of CuAlNiCrFe only grew by ~20%.



中文翻译:

高速激光熔覆制备的用于 TBC 结合涂层的 CuAlxNiCrFe 高熵合金的 TGO 和 Al 扩散行为

CuAl x NiCrFe (x = 0.5, 1, 1.5, 2) 具有良好高温抗氧化性的高熵合金 (HEAs) 通过高速激光熔覆沉积为结合涂层。随着铝含量的增加,CuAl x NiCrFe 结合涂层的微观结构表现出柱状到等轴晶的转变。在 1100 °C 下氧化 100 小时后,所有粘合涂层都生成了均匀致密的氧化铝层,并显示出低热生长氧化物 (TGO) 生长速率。在氧化过程中,CuAl 1.5 NiCrFe 表现出极低的 Al 扩散系数,CuAlNiCrFe 的晶粒尺寸仅增长约 20%。

更新日期:2021-09-13
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