Plastic Deformation Mechanism of Nanocrystalline Nickel
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摘要: 为了深入探讨纳米金属的力学性能特别是塑性变形机制,对纳米金属Ni进行了不同程度的冷轧变形.通过X射线衍射分析和透射电镜观察对纳米金属Ni的微观结构和变形机制进行了研究,并对不同变形量下的晶格常数进行了计算.研究表明,随变形量增大,纳米晶体的晶粒尺寸逐渐增大,从最初的16.6 nm增大到28.7 nm,这种增长是由于部分方向(区域)晶粒长大的结果;变形量较小(小于30%)时,位错的活动与晶粒旋转是的变形主要方式,变形量较大(超过30%)时,晶界发射不全位错与孪晶的交互作用协调变形;纳米Ni的平均晶格常数为0.353 3 nm,略高于粗晶Ni的晶格常数.Abstract: Nanocrystalline nickel was cold-rolled with different strains to further research the mechanical properties of nano-metals,especially the mechanism of plastic deformation.The microstructure and deformation mechanism of nanocrystalline nickel were investigated by the transmission electron microscope(TEM) and the X-ray diffraction(XRD) analysis.In addition,the lattice constant of nanocrystalline nickel with different strains was calculated.The research results show that the grain size increases from 16.6 to 28.7 nm with the increase of deformation due to the growth of grains in some regions or directions.When the strain is less than 30%,the deformation is dominated by dislocation activity and grain rotation.When the strain exceeds 30%,partial dislocation generated by GBs(grain boundaries) leads to twinning,and the partial dislocation and the twinning harmonize during the deformation.The average lattice constant of nanocrystalline nickel is 0.353 3 nm greater than that of coarse grain nickel.
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Key words:
- nickel /
- nanocrystalline /
- twinning /
- grain size /
- dislocation
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