文献类型：期刊文献

英文题名：High-valent metal oxide-induced exceptional HTHP corrosion resistance in TiVNbTa refractory high-entropy alloy

作者：Yu, Tingxiao Li, Juan Qin, Qingdong Yin, Rong Zhao, Honglong Luo, Shaomin Yang, Chuang

第一作者：Yu, Tingxiao

通信作者：Qin, QD[1];Yang, C[1];Qin, QD[2];Zhao, HL[2]|[14440c17cf7bd1f4ff05e]秦庆东;[144400fa133c5f6c59dc2]秦庆东;

机构：[1]Guizhou Normal Univ, Sch Mat & Architecture Engn, Guiyang 550003, Peoples R China;[2]Guizhou Inst Technol, Dept Mat & Energy Engn, Guiyang 550003, Peoples R China;[3]Guizhou Inst Technol, Special Funct Mat Collaborat Innovat Ctr Guizhou P, Guiyang 550003, Peoples R China

第一机构：Guizhou Normal Univ, Sch Mat & Architecture Engn, Guiyang 550003, Peoples R China

通信机构：corresponding author), Guizhou Normal Univ, Sch Mat & Architecture Engn, Guiyang 550003, Peoples R China;corresponding author), Guizhou Inst Technol, Dept Mat & Energy Engn, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2025

卷号：48

外文期刊名：MATERIALS TODAY COMMUNICATIONS

收录：;EI(收录号：20253619102522);Scopus(收录号：2-s2.0-105014752560);WOS:【SCI-EXPANDED(收录号:WOS:001567798900003)】；

基金：This work was supported by the Guizhou Province Natural Science Basic Research Planning Project (Qianke He Jichu MS [2025] 183) , The Major Science and Technology Special Project of Guizhou Province: Key Technologies for the Design, Preparation, and Processing of High-Performance Metals for Aerospace Applications, Guizhou Province High Level Innovative Talents (No. Qianke He Platform and Talent (2022) 011-1) , Natural Science Project of Guizhou Provincial Education Department (Qian jiaoji (2023) 078) , Guizhou Science and Technology Support Program (Qianke He Zhicheng DXGA [2025] Yiban 004) , Guizhou Provincial Department of Education Hundreds schools and thousands enterprises in science and technology research unveiled the leading projects (Qian Keji [2024] 002) , Guizhou Province Youth Science and Technology Talent Support Project.

语种：英文

外文关键词：TiVNbTa RHEA; Microstructure; HTHP corrosion resistance; DFT calculations

摘要：The high-temperature and high-pressure (HTHP) corrosion resistance of the TiVNbTa refractory high-entropy alloy (RHEA) was investigated in a 3.5 wt.% NaCl and 0.18 M H2SO4 mixed solution, using IN625 superalloy as a benchmark. The TiVNbTa RHEA exhibited a single body-centered cubic (BCC) phase with a dendritic microstructure, demonstrating superior HTHP corrosion resistance. Electrochemical tests revealed a corrosion current density (Icorr) of 4.786 x 10-3 A/m2 and an average corrosion rate (Rcorr) of 0.0192 mm/year, which are 50 and 30 times lower than those of IN625 superalloy, respectively. X-ray photoelectron spectroscopy (XPS) analysis identified a stable passive film primarily composed of high-valent oxides (Nb2O5, Ta2O5, TiO2, V2O5), and the thermodynamic stability of this film was further confirmed by Gibbs free energy calculations. Density functional theory (DFT) elucidated enhanced oxygen adsorption energy (-6.155 eV) and an elevated work function (4.471 eV), promoting oxide formation and film integrity. Localized pitting in inter-dendritic (IR) regions was attributed to the selective dissolution of TiO2/V2O5 in acidic environments, which was mitigated by hydroxide-assisted passivation repair. The exceptional HTHP resistance arises from the synergistic effects of high bond strength, stable oxide formation, and self-healing mechanisms. This work establishes TiVNbTa RHEA as a groundbreaking alternative to conventional superalloys in extreme corrosive environments, validated by integrated experimental and computational methodologies.