Effect of Y on Oxidation Behavior of Directionally Solidified Ni-Based Single-Crystal Superalloy

• Published in: Chinese journal of mechanical engineering 2024-09, Vol.37 (1), p.100-13, Article 100
• Main Authors: Zhao, Zihan, Guan, Kai, Cui, Renjie, Qin, Jianchao, Huang, Zhaohui
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Directional solidification; Electrical Machines and Networks; Electronics and Microelectronics; Element Y; Engineering; Engineering Thermodynamics; Heat and Mass Transfer; Inductively coupled plasma; Instrumentation; Isothermal oxidation; Machines; Manufacturing; Mechanical Engineering; Nickel base alloys; Original Article; Oxidation; Oxidation rate; Oxidation resistance; Oxidation tests; Oxide scale; Power Electronics; Processes; Scale (corrosion); Single crystals; Single-crystal superalloy; Smart Material; Superalloys; Theoretical and Applied Mechanics; Yttrium
• ISSN: 2192-8258; 1000-9345; 2192-8258
• DOI: 10.1186/s10033-024-01086-6

The effect of yttrium (Y) addition on the oxidation behavior of a Ni-based directionally solidified single-crystal superalloy is investigated in this study. Isothermal oxidation tests for samples with different levels of Y addition are conducted at 1100 °C in air. The Y content of the samples is determined by the actual pickup amount obtained from an Inductively Coupled Plasma-Atomic Emission Spectrometry test. It is discovered that the addition of Y increases the oxide resistance by the scale of an adhesive double-layer oxide, which is composed of Al 2 O 3 and spinel Ni(Cr,Al) 2 O 4 . With 70 ppm of Y addition, the oxidation mass gain decreases from 12.6 g/m 2 for the alloy without Y addition to 5.3 g/m 2 , and the oxidation rate decreases significantly. In addition, the internal nitride disappears after Y doping because of an increase in oxidation scale adherence and a decrease in oxidation products. In this study, the alloy with 660 ppm Y addition demonstrates the best oxidation resistance.