Influence of grain boundary on the fracture toughness of full lamellar γ-TiAl alloys

被引：0

作者：

Zheng, RT ^{[1
]}

Zhang, YG

Chen, CQ

Cheng, G

机构：

[1] Beijing Normal Univ, Beijing 100875, Peoples R China

[2] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2003年 / 32卷 / 12期

关键词：

gamma-TiAl based alloys; fully lamellar microstructure; grain boundary; fracture toughness;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fracture toughness is strongly influenced by microstructure in gamma-TiAl alloys. In order to in depth study the effect of grain boundaries on the fracture toughness of fully lamellar(FL) gamma-TiAl alloys, in-situ tensile experiments were carried out in the scanning electron microscope (SEM), enabling the crack paths to be observed for the microstructures of FL and nearly fully lamellar(NFL) Ti-46. 5Al-2. OCr-1. 5Nb-1. OV alloys. It was found that the effects of grain boundaries on the fracture the toughness depended on the crack path direction and ligament size. It was also noted that contributions to the fracture toughness of FL gamma-TiAl based alloys come from the matrix toughness, ligament toughening and serrated grain boundary toughening.

引用

页码：1003 / 1006

页数：4