摘要
为了深入研究晶界对全片层组织TiAl基合金断裂韧性的影响,采用SEM原位拉伸实验,对全片层和近全片层Ti-46.5Al-2.0Cr-1.5Nb-1.0V合金中裂纹的扩展进行了观测。发现晶界对全片层组织TiAl合金断裂韧性的影响表现在改变裂纹扩展方向以及影响韧带的尺寸上。并得出结论:全片层组织γ-TiAl合金的断裂韧性来源于基体的断裂韧性、片层晶界导致的韧性增强以及片层导致的韧带增韧。
Fracture toughness is strongly influenced by microstructure in γ-TiAl alloys. In order to in depth study the effect of grain boundaries on the fracture toughness of fully lamellar(FL) γ-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. 0Cr-1. 5Nb-1. 0V 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 γ-TiAl based alloys come from the matrix toughness, ligament toughening and serrated grain boundary toughening.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2003年第12期1003-1006,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金资助项目(59895150)
关键词
Γ-TIAL合金
全片层组织
晶界
断裂韧性
SEM
TiAl based alloys
fully lamellar microstructure
grain boundary
fracture toughness
