MICROSTRUCTURE AND DUCTILITY OF TIAL ALLOYS MODIFIED BY CR-ADDITIONS

被引：25

作者：

HUANG, SC ^{[1
]}

HALL, EL ^{[1
]}

SHIH, DS ^{[1
]}

机构：

[1] GE AIRCRAFT ENGINES,CINCINNATI,OH 45215

来源：

ISIJ INTERNATIONAL | 1991年 / 31卷 / 10期

关键词：

TIAL; ALLOYING EFFECT; MECHANICAL PROPERTIES; DUCTILITY; ALCHEMI MEASUREMENT; INTERMETALLIC COMPOUND; DEFORMATION;

D O I：

10.2355/isijinternational.31.1100

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The effects of Cr additions to TiAl-base alloys have been investigated, using both consolidated rapid-solidification materials and wrought ingot materials. The composition ranges studied are 0-4 at% Cr and 44-54 at% Al. It was found that Cr additions do not affect the deformation behavior of single-phase gamma alloys. However, they significantly enhance the plasticity of Al-lean duplex alloys, which contain grains of single-phase gamma and grains of lamellar gamma/alpha-2. Plastic elongations of approximately 4% were measured in wrought Ti-46Al-2Cr at room temperature. Other Cr effects on the microstructure, phase stability, and site occupancy were characterized and correlated to the observed mechanical behavior. It was concluded that the ductilization effect of Cr is partially due to its ability to occupy Al lattice sites and modify the Ti-Al bond. It is also partially due to its ability to promote twin formation, by modifying the Al partitioning and therefore the gamma/alpha-2 volume ratio in the lamellar regions.

引用

页码：1100 / 1105

页数：6

共 17 条

[1]

HALL EL, 1989, MATER RES SOC SYMP P, V133, P693

[2] STOICHIOMETRY EFFECTS ON THE DEFORMATION OF BINARY TIAL ALLOYS [J].