Influence of low-frequency vibrations on the compression behavior and microstructure of T2 copper

Influence of low-frequency vibrations on the compression behavior and microstructure of T2 copper
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低频振动对T2铜压缩行为和显微组织的影响

DOI:
10.1016/j.msea.2017.10.083
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发表时间:
2018-01
期刊:
Materials Science and Engineering: A
影响因子:
--
通讯作者:
Li Jianjun
Li Jianjun
中科院分区:
其他
文献类型:
--
作者:
Deng Lei;Li Pan;Wang Xinyun;Zhang Mao;Li Jianjun

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在这项研究中,低频振动对T2铜的室温压缩行为的影响进行了实验研究。在叠加低频振动时,成形载荷显著降低。在三个振动参数,即频率,振幅和进给速度的调查,振幅起着最重要的作用,在减少负载。应力波的叠加可以解释低频振动时载荷降低的形成机理。由于应力波叠加引起的内应力增加,所需的成形载荷降低。讨论了振动对压缩试样微观结构的影响。在低频振动条件下,循环冲击载荷导致位错密度增加,形成位错胞,并逐渐演化成新的晶界,引起晶粒细化。
In this study, the influence of low-frequency vibrations on the room-temperature compression behavior of T2 copper was experimentally investigated. Upon superposing a low-frequency vibration, the forming load noticeably reduced. Among the three vibration parameters investigated, viz. frequency, amplitude, and feeding rate, vibration amplitude plays the most important role in load reduction. The superposition of stress waves can explain the mechanism of forming load reduction at low-frequency vibrations. Due to an increase in the internal stress caused by the superposition of stress waves, the required forming load reduced. The influence of the vibrations on the microstructures of compressed specimens was also discussed. Under low-frequency vibration conditions, cyclic impact loading leads to an increase in the density of dislocations and the formation of dislocation cells, which gradually evolve into new grain boundaries, causing grain refinement.
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