Interdiffusion behavior and lifetime prediction of Co-Al coating on Ni-based superalloy

Jiang, Jingliang; Zhou, Ting; Shao, Wei; Zhou, Chungen

doi:10.1016/j.jallcom.2019.02.019

Cited by 17 publications

(1 citation statement)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The formation of alumina scales may be achieved by pack aluminizing the alloy’s surface [ 13 , 14 , 15 ]. The application of Al-Co coatings could significantly extend the alloy’s lifetime [ 16 , 17 , 18 , 19 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Oxidation of Al-Co Alloys at High Temperatures

et al. 2020

View full text Add to dashboard Cite

In this work, the high temperature oxidation behavior of Al71Co29 and Al76Co24 alloys (concentration in at.%) is presented. The alloys were prepared by controlled arc-melting of Co and Al granules in high purity argon. The as-solidified alloys were found to consist of several different phases, including structurally complex m-Al13Co4 and Z-Al3Co phases. The high temperature oxidation behavior of the alloys was studied by simultaneous thermal analysis in flowing synthetic air at 773–1173 K. A protective Al2O3 scale was formed on the sample surface. A parabolic rate law was observed. The rate constants of the alloys have been found between 1.63 × 10−14 and 8.83 × 10−12 g cm−4 s−1. The experimental activation energies of oxidation are 90 and 123 kJ mol−1 for the Al71Co29 and Al76Co24 alloys, respectively. The oxidation mechanism of the Al-Co alloys is discussed and implications towards practical applications of these alloys at high temperatures are provided.

show abstract