THE MUTUAL EFFECTS OF BORON, ZIRCONIUM AND ALUMINUM ON GRAIN-BOUNDARY SEGREGATION IN NI3AL INTERMETALLIC COMPOUNDS

被引：29

作者：

CHUANG, TH

机构：

[1] Graduate Institute of Materials Engineering, National Taiwan University, Taipei

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1991年 / 141卷 / 02期

关键词：

D O I：

10.1016/0921-5093(91)90767-H

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The fracture surface chemistries of Ni3Al intermetallic compounds with additions of boron and/or zirconium were analysed by Auger electron spectroscopy. The concentration variations of boron, zirconium and aluminium on grain boundaries and their influence on fracture behaviour were evaluated. The results indicate that boron and zirconium segregated to grain boundaries, while the aluminium content decreased. The aluminium depletion is caused by the zirconium segregation rather than by the boron segregation. Boron segregation markedly improves the ductility, but zirconium additions do not seem to have the same beneficial effect. On the contrary, the increase in aluminium content in the non-boron-doped Ni3Al(Zr), results in a stronger tendency towards intergranular failure.

引用

页码：169 / 178

页数：10