The oxidation of four oxide dispersion strengthened Ni-5Al-xSi-0.2Y2O3 (x = 1, 3, 5, 7 wt.%) alloys in air at 1100 °C. (1st April 2018)

• Record Type: Journal Article
• Authors: Sun, Duanjun; Liang, Chunyuan; Wang, Erpeng; Liu, Haifei; Zhang, Xiuhai
• Is Part Of: Corrosion science. Volume 133(2018)
• Page Start: 336
• Page End: 348
• Publication Date: 2018-04-01
• Subjects: Ni-based superalloy -- Oxidation -- Silicon content -- Oxide scale; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.01.036
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: Silicon could promote the selective oxidation of Al. Silicon exerted third-element effect and improved oxidation resistance significantly. 5 wt.% Silicon improved spallation resistance of scales significantly. Single and continuous α-alumina scales were formed on Ni-5Si-5Al-0.2Y2 O3 alloys. Abstract: The cyclic oxidation behavior of oxide dispersion strengthened Ni- x Si-5Al-0.2Y2 O3 (with x = 1, 3, 5, 7 wt.%) superalloys was investigated at 1100 °C for 100 h. The alloys contained 5 wt.% silicon possessed the best oxidation resistance with the formation of continuous external α-alumina scales developed on the surface without any noticeable internal oxides. Therefore, the addition of silicon decreased the oxidation rate significantly and exerted the third-element effect by reducing the critical Al content needed for the transition from its internal to external oxidation. However, the excessive silicon content (7 wt.%) reduced the spallation resistance of oxide scales.