INTERACTION BETWEEN Ti-47Al-2Cr-2Nb ALLOY AND Y2O3 CERAMIC DURING DIRECTIONAL SOLIDIFICATION

被引：0

作者：

Zhang Huarui ^{[1
]}

Gao Ming ^{[1
]}

Tang Xiaoxia ^{[1
]}

Zhang Hu ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2010年 / 46卷 / 07期

关键词：

TiAl alloy; Y2O3; directional solidification; Y2O3/Al2O3 double layers ceramic tube; INTERMETALLIC TI-46AL-2W-0.5SI ALLOY; PST CRYSTALS; DEFORMATION;

D O I：

10.3724/SP.J.1037.2010.00890

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Interaction between Ti-47Al-2Cr-2Nb alloy and inner layer Y2O3 of Y2O3/Al2O3 double-layer ceramic tube has been investigated during directional solidification. The results show that the Y2O3 layer effectively prevents the chemical reactions between TiAl alloy melt and exterior layer Al2O3 with lower chemical stability by blocking their direct contact. The DS alloy ingot contains Y2O3 inclusions which mainly come from the shedding of Y2O3 from ceramic tube inwall by being penetrated and eroded by fluid alloy melt in the initial phase of the directional solidification test. The average volume fraction of the inclusions is only about 0.14% and is insensitive to time. The re-sintering of the Y2O3 ceramic surface layer occurs and a 2-10 mu m dense barrier layer is formed by dint of alloy melt at high temperature. It prevents further pervasion of alloy melt into the Y2O3 ceramic and shedding of imperfectly sintered Y2O3 particles into the alloy melt.

引用

页码：890 / 896

页数：7