CAJ | 학술논문

研究了2524铝合金在固溶处理后立即预拉伸对随后在170℃时效的硬度和微观组织的影响.测量了在不同预拉伸条件下的时效硬度,并通过透射电镜观察其微观组织.结果表明:与未拉伸样品相比,随着预拉伸量的增加,预拉伸样品的峰值硬度值逐渐增加,而达到峰值硬度所需的时间也逐渐缩短；预拉伸合金中,S(Al2CuMg)相的数量增多,但其长度缩短；此外,峰值状态GPB区的密度随着应变量的增加而减小.当预拉伸应变达到5％时,S相对峰值状态起主要作用.常规时效的2524合金在峰值时以GPB区和S相为主,在预拉伸样品中更弥散、细小的S相导致硬度值高于常规时效的值.
연구료2524려합금재고용처리후립즉예랍신대수후재170℃시효적경도화미관조직적영향.측량료재불동예랍신조건하적시효경도,병통과투사전경관찰기미관조직.결과표명:여미랍신양품상비,수착예랍신량적증가,예랍신양품적봉치경도치축점증가,이체도봉치경도소수적시간야축점축단；예랍신합금중,S(Al2CuMg)상적수량증다,단기장도축단；차외,봉치상태GPB구적밀도수착응변량적증가이감소.당예랍신응변체도5％시,S상대봉치상태기주요작용.상규시효적2524합금재봉치시이GPB구화S상위주,재예랍신양품중경미산、세소적S상도치경도치고우상규시효적치.
The effects of pre-stretching following solution treatment on the hardness and microstructures of aged 2524 aluminium alloy at 170 ℃ were studied.Ageing hardness values under different pre-stretching conditions were measured,and the corresponding microstructures were characterized by transmission electron microscopy(TEM).The results show that compared with unstretched samples,the peak hardness is increased and the time to reach the peak hardness is reduced with the increase of pre-strain; the number density of S(Al2CuMg)phases is increased and the length is shortened in pre-stretched alloy.Additionally,the number density of GPB zones is decreased with the increase of pre-strain in peak-aged samples.When the pre-strain is up to 5％,S phases play the predominant contribution to the peak hardness.Fine and uniformly distributed S phases lead to a higher hardness than GPB zones together with S phases existing in conventionally aged 2524 alloy.