摘要
本文研究了多晶99.999wt-%Al 在拉压疲劳早期阶段中应力、内耗、超声衰减随循环圈数的变化关系,以及它们与试样内部位错组态的联系。实验结果表明,当超声衰减达到最大值时,对应的位错组态为缠结带与单根位错并存,当应力达到最大值时,对应的位错组态为胞状结构。
Variation of the stress σ,internal friction σ^(-1)and ultrasonic attenuation Δα ver-sus cyclic number under push-pull fatigue strain for 99.999wt-% Al polycrystalline specimenswas measured.The dislocation configuration at different stages of fatigue was observed byTEM.Experimental results indicate that the dislocation configuration corresponding to Δαmaximium on Δα-N curve consists of tangle bands,accompaning with single dislocation seg-ments located between the tangle bands,σ maximium on σ-N curve corresponds to anincomplete dislocation cell structure.
基金
国家自然科学基金
关键词
疲劳
应力
内耗
铝
fatigue
stress
dislocation configuration
internal friction
ultrasonic attenuation
