文档介绍：
稀土 Y 对 Ti-48Al-2Nb-2Cr 合金高温抗氧化
性能的影响
周玉俊,周雪峰,陈锋,彭英博,李沛,陈光
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(南京理工大学材料设计与评价教育部工程研究中心)
摘要:通过 750℃、850℃高温循环氧化实验,研究了添加 %稀土 Y 元素对 Ti-48Al -2Nb-2Cr 合金高
温抗氧化行为的影响,采用 XRD、SEM、EDS 等从氧化动力学、氧化层成分组成、表面形貌、剖面结构进行
了分析,结果表明:Y 元素添加改善了 Ti-48Al-2Nb-2Cr 合金的抗氧化性能,减缓了氧化速率,减小了氧
化增重,细化了氧化层颗粒,且基体与氧化层间无开裂剥落现象,Y 的添加改变了氧化层结构,促进了一
层连续致密、具备保护性能 Al2O3层生成。
关键词:金属材料;TiAl 合金;稀土 Y;抗氧化性能;
中图分类号:TG
Influence of Y-addition on the oxidation resistance of
Ti-48Al-2Nb-2Cr alloys
ZHOU Yujun, ZHOU Xuefeng, CHEN Feng, PENG Yingbo, LI Pei, CHEN Guang
(Engineering Research Center of Materials Behavior and Design Minstray of Education, Nanjing
University of Science and Technology)
Abstract: In this paper, influence of Y-addition on the oxidation resistance of Ti-48Al-2Nb-2Cr
alloys was studied by cyclic oxidation experiment in air at 750℃ and 850℃. Y-containing alloys
showed better oxidation resistance than Y-free alloy with a significantly lower weight gain, more
uniform and refined oxide particle in the dense oxide layer, no spallation and cracking at the
scale/substrate interface. And Y-addition strengthened to form continuous Al2O3 layer but
suppressed the development of TiO2 in the oxide multi-layered structures.
Key words: metal material;TiAl-based alloys; Y element; oxidation resistance
0 引言
γ-TiAl 合金作为轻质结构材料,兼具金属与陶瓷的性能,如低密度(~),
高熔点