摘要
对激光辐照后Ly12 CZ铝合金的疲劳寿命明显提高的原因进行了微观研究。结果表明位错胞尺寸λ在疲劳失效时都趋向于一常量λ_c。结合损伤力学建立了该材料的疲劳损伤判据及损伤演变过程,分别为: D_c=1-(λ_c/λ_0)~P D=1-{1-[1-(λ_c/λ_0)^(P(1+γ))](N/N_f)}^(1/(1+γ)
The change of microstructure of fatigue specimens before and after la-
ser radiation was studied by transmission electron microscopy. The results show that
the diameter of dislocation cell λ tends to a constant λ_c at fatigue failure. Based on
the principles of continuuous damage mechanics, expressions of the fatigne damage
criterion and processes of fatigue damage evolution for LY12CZ have been derived.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第3期A207-A212,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金
关键词
铝合金
激光辐照
位借胞
疲劳
损伤
laser radiation
dislocation cell
fatigue
damage mechanics
