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采用分离式Hopkinson压杆装置对AA7055铝合金试件分别进行1到4次动态压缩,利用光学显微镜对压缩后试件进行了微观组织观察,研究了动态压缩时7055铝合金的宏观力学性能及剪切局部化现象。随着压缩次数的增加,材料的力学响应由应变硬化转变为应变软化,同时试件微观组织由均匀变形转变为形成剪切局部化;初始形成的剪切局部化对试件的屈服应力没有影响,随着加载的进行,剪切局部化的发展与流动应力的下降同时出现。
The split Hopkinson pressure bar device was used to dynamically compress the AA7055 aluminum alloy specimens one to four times respectively. The microstructures of the compressed specimens were observed under a light microscope. The macroscopic mechanical properties and shear properties of the 7055 aluminum alloy during dynamic compression were studied. Cut the phenomenon of localization. With the increase of the number of compressions, the mechanical response of the material changes from strain hardening to strain softening, meanwhile the microstructure of specimen changes from uniform deformation to shear localization. The initial shear localization has no effect on the yield stress of specimens , With the loading progress, the development of shear localization and flow stress decline at the same time.