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

作　　者：Zihan Zhao Kai Guan Renjie Cui Jianchao Qin Zhaohui Huang 

机构地区：[1]Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China

出　　处：《Chinese Journal of Mechanical Engineering》2024年第5期510-522,共13页中国机械工程学报（英文版）

基　　金：Supported by Preliminary Research Project of China (Grant No. J2019-Ⅵ-0023)

摘　　要：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℃ 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.

关 键 词：Isothermal oxidation Element Y Single-crystal superalloy Oxide scale 

分 类 号：TG132.3[一般工业技术—材料科学与工程]