高铌TiAl合金与陶瓷型壳的界面反应

被引：3

作者：

林秀德

薛祥义

钟宏

张铁邦

李金山

机构：

[1] 西北工业大学凝固技术国家重点实验室

来源：

稀有金属材料与工程 | 2013年 / 42卷 / 08期

关键词：

高铌TiAl合金; 界面反应; 氧; 组织转变;

D O I：

暂无

中图分类号：

TG146.23 [];

学科分类号：

080502 ;

摘要：

研究了高铌TiAl合金Ti-44Al-8Nb-0.2W-0.1B-0.1Y(at%)分别与Al2O3/ZrO2/Y2O3坩埚的界面反应。测得界面反应层的厚度分别为40,170和20μm。研究中最大的发现在于Ti-44Al-8Nb-0.2W-0.1B-0.1Y(at%)合金在3种坩埚中凝固后显微组织的转变。经测定该合金在3种坩埚中凝固获得的试样中氧含量分别为0.35,0.41和0.11(at%)。由于在合金熔化和凝固过程中,坩埚中的氧元素扩散进入合金基体,较高的氧含量导致合金显微组织发生转变,在与Al2O3和ZrO2坩埚反应的合金中发生了包晶反应。作为对比,选取一种低铌含量的TiAl合金Ti-49.5Al-2Cr-2Nb。经测定在3种坩埚中反应的氧含量分别为0.40,0.63和0.25(at%),但是组织却没有明显的差异。

引用

页码：1568 / 1571

页数：4

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