摘要
本文研究了LD10铝合金和Ti-6Al-4V合金近门槛值疲劳裂纹扩展的断口形貌。SEM观察表明:两种合金的近门槛值区域(1×10^(-7)-1×10^(-5)mm/cycle)的微观断口形貌均为循环解理刻面;在LD10铝合金中循环解理刻面多数呈锯齿型或梯田状,而在Ti-6Al-4V合金中主要为孤岛状循环解理刻面。本文在实验观察的基础上,进一步阐明了近门槛值疲劳裂纹扩展机理。
The fatigue fracture surface micromorphology in the near-threshold re-gion was studied in LD10 aluminum alloy and Ti-6A1-4V alloy. The SEM examina-tions show that the fracture surface of both alloys at low crack growth rates (1×10^(-7)—1×10^(-5)mm/cycle) takes on a cyclic cleavage facet appearance. The typical cy-clic cleavage facets were either sawtoothed facets or terraced facets for LD10 andisolated island facets for Ti-6A1-4V alloy. The paper explicated the mechanism ofnear-threshold fatigue crack growth on the basis of experimental observations
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第4期A301-A306,共6页
Acta Metallurgica Sinica
关键词
近门槛值
疲劳裂纹
断口
合金
fatigue crack
fractograph
near-threshold
