含镀层薄膜中的尺寸效应和包辛格效应研究

发布时间：2018-04-26 09:41

本文选题：晶体塑性 + 含镀层薄膜　；参考：《中国科技论文》2017年10期

【摘要】：为了研究界面与位错相互作用对材料塑性行为的影响,建立了基于位错机制的晶体塑性理论。通过引入描述位错运动的微观平衡方程和几何必需位错对塑性变形的2种硬化机制,模拟了含镀层薄膜中的尺寸效应和包辛格效应。结果表明:镀层会引起附近位错的塞积,塞积的位错会增强硬化从而产生尺寸效应,并且在卸载过程中不均匀的应力分布会使得局部较早地产生反向塑性变形,引起包辛格效应。另一方面,通过将应力-应变曲线与实验结果对比发现,硬化主要是由位错相互作用产生的背应力引起的而不是滑移阻力。
[Abstract]:In order to study the effect of interface and dislocation interaction on the plastic behavior of materials, the crystal plasticity theory based on dislocation mechanism is established. By introducing the micro equilibrium equation describing dislocation motion and the 2 hardening mechanisms of the geometric necessary dislocation to the plastic deformation, the size effect and Basinger effect in the film containing the coating are simulated. The deposit will cause the accumulation of the dislocation in the vicinity, the dislocation of the plug will increase the hardening and thus produce the size effect, and the uneven stress distribution in the unloading process will cause the local reverse plastic deformation early to cause the Basinger effect. On the other hand, by comparing the stress stress curve to the experimental results, it is found that the hardening is mainly caused by the experimental results. Dislocation interaction produces back stress rather than slip resistance.

【作者单位】：清华大学航天航空学院;
【基金】：高等学校博士学科点专项科研基金资助项目(20130002120014)
【分类号】：TB383.2

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