摘要
在名义Ⅰ型和Ⅰ／Ⅱ复合型载荷下研究了晶体取向和加载模式对Ni3Al合金单晶体疲劳开裂行为的影响.结果表明：疲劳开裂行为强烈地依赖于晶体取向和加载模式.在单晶体中，疲劳裂纹总是沿着具有最大切应力的滑移面开裂.根据单晶体的实验结果，解释了用三种主要的复合型断裂准则所预测的多晶体在复合型加载下的疲劳开裂行为.
Fatigue tests under nominal I and mixed modeⅠ/ Ⅱ loading were carried out on Ni3Al alloy single crystals. The effects of crystal orientation and load mode on the fatigue cracking behavior were studied. It was found that the crack paths are dependent on both crystal orientation and applied load mode. Fatigue cracking in single crystals under mixed mode Ⅰ/ Ⅱ loading always occurs on the planes with maximum resolved shear stress rather than on those with maximum normal stress. The cracking behavior predicted by main mixed mode criteria in polycrystalline materials under a mixed mode can be explained from the present results.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第10期1009-1014,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金!59223001
关键词
疲劳开裂
晶体
取向
载荷
金属间化合物
crystal orientation, mixed mode loading, Ni_3Al alloy single crysta1, fatigue cracking
