CAJ | 학술논문

通过对不同状态的7075铝合金以不同的应变速率和不同的应变锻造,并利用了光镜(OM)、透射电镜(TEM)对热变形显微组织进行观察.实验表明:对于7075铝合金,较高的应变速率有利于出现动态再结晶,动态再结晶的方式为不连续动态再结晶,当应变速率较低时,只出现动态回复.弥散的第二相粒子在动态再结晶过程中起了重要作用.
통과대불동상태적7075려합금이불동적응변속솔화불동적응변단조,병이용료광경(OM)、투사전경(TEM)대열변형현미조직진행관찰.실험표명:대우7075려합금,교고적응변속솔유리우출현동태재결정,동태재결정적방식위불련속동태재결정,당응변속솔교저시,지출현동태회복.미산적제이상입자재동태재결정과정중기료중요작용.
7075 aluminum alloy with different states (T6 and solution treatment) were forged at different strain rates (10-2s-1and 102s-1) and strains. OM (optical microscope) and TEM (transmission electronic microscope) were used to observe themicrostructure of 7075 aluminum alloy after hot deformation. Experiment results indicate that dynamic recrystallization for7075 aluminum alloy is apt to occur under the higher strain rate and recrystallization mechanism is discontinuous dynamicrecrystallization, dynamic recovery takes place at the lower strain rate. The second-phase particles play a very important role inthe process of refinement of the grains.