Ti-Zr-Nb系高熵合金微观结构和腐蚀行为研究  

Microstructure and Corrosion Behavior of Ti-Zr-Nb High Entropy Alloy

作　　者：贾玉振 王朋飞[1] 张伟[1] 王昱 戴训[1] JIA Yuzhen;WANG Pengfei;ZHANG Wei;WANG Yu;DAI Xun(Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610213

出　　处：《原子能科学技术》2021年第S02期235-241,共7页Atomic Energy Science and Technology

基　　金：中核集团“青年英才”项目。

摘　　要：为探索高熵合金作为反应堆先进包壳材料的可能性,对Ti-Zr-Nb系高熵(中熵)合金的微观结构和腐蚀行为进行了分析。结果表明:Ti-Zr-Nb系合金主要为简单BCC结构;在Ti-Zr-Nb系合金中添加V元素对合金的微观结构影响不大;在合金中添加Al元素,会出现有序B2相结构;在360℃/18.6 MPa高温高压纯水腐蚀和高温水蒸气腐蚀氧化过程中,TiZrNb合金会出现表面氧化膜脱落的现象。在Ti-Zr-Nb系合金中添加适量Al元素(原子百分比约为15%),可提高合金在360℃高温高压纯水条件下和高温水蒸气条件下形成的氧化膜的稳定性,抑制氧化膜的脱落。当Ti-Zr-Nb系合金中Al元素含量较高(原子百分比为25%)时,合金在360℃高温高压纯水中会快速发生腐蚀转折,发生加速腐蚀。在Ti-Zr-Nb系合金中添加适量的Al元素,可有效提高合金的耐腐蚀性能,过高的Al含量会降低耐腐蚀性能。The microstructure and corrosion properties of Ti-Zr-Nb high entropy alloys(HEAs)were studied.The results show that the microstructure of the Ti-Zr-Nb alloy was composed of a single BCC phase.Addition of V in Ti-Zr-Nb alloys has little effect on the microstructure of the alloys,but additon of Al will induce ordered B2 phase structure.During the corrosion process in 360℃water and in high temperature steam,the corrosion oxide layer on TiZrNb alloy will spall.Appropriate amount of Al addition(atomic percentage about 15%),will increase the stability of oxide layer formed on Ti-Zr-Nb alloys in 360℃water and in high temperature steam,and will inhibit the spallation of oxide layer.Large amount of Al addition(atomic percentage is about 25%),corrosion acceleration will happen during the corrosion of alloys in 360℃water.Certain amount of Al addition will increase the corrosion property of Ti-Zr-Nb alloys,while large content of Al will decrease the corrosion property.

关 键 词：TiZrNb 高熵合金 微观结构 腐蚀行为 

分 类 号：TG146.4[一般工业技术—材料科学与工程]