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简要综述了金属强度的晶粒尺寸效应和样品尺寸效应的研究历史和现状,揭示了它们的基本强化机制分别是增加位错运动的阻力和增加位错产生的难度.在一些纳米金属中发现这2种机制同时起作用,从而指出利用这2种机制调控纳米金属强塑性的可能性.这种可能性在纳米纯Al中得到了验证.
The history and current situation of the study on the grain size effect and sample size effect of metal strength are briefly reviewed, revealing that their basic strengthening mechanism is to increase the resistance of dislocation movement and increase the difficulty of dislocation respectively. In some nano-metals, it is found that Two kinds of mechanisms work at the same time, which indicates the possibility of using these two mechanisms to control the strong plasticity of nano-metals. This possibility has been verified in nano-pure Al.