Plastic Deformation of Nanocrystalline Zinc Investigated by Positron Annihilation Lifetime Spectroscopy

Plastic Deformation of Nanocrystalline Zinc Investigated by Positron Annihilation Lifetime Spectroscopy
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正电子湮灭寿命光谱研究纳米晶锌的塑性变形

DOI:
10.1088/0256-307x/30/5/057804
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发表时间:
2013-05
影响因子:
3.5
通讯作者:
Wang Zhu
Wang Zhu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zhou Kai;Li Hui;Wang Zhu

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用正电子湮没寿命谱研究了纳米Zn的塑性变形。通过在样品的表面上施加压力来进行变形,这导致样品的厚度减小。纳米晶样品和常规块体样品之间的相对厚度减小随压力增加的不同行为表明,在纳米晶样品中存在不同的塑性变形机制。正电子寿命的结果间接证实,该机制是基于晶界,如晶界滑动。一旦纳米晶样品在高温下退火,厚度减少和正电子寿命结果的变化变得类似于传统的块状样品。此外,纳米晶样品内部的空位团被发现是一个障碍的塑性变形过程。
The plastic deformation of nanocrystalline Zn is investigated by positron annihilation lifetime spectroscopy. The deformation is carried out by exerting a pressure on the surface of the samples, which causes a thickness reduction of the samples. The different behavior of the relative thickness reduction with the increasing pressure between the nanocrystalline sample and the conventional bulk sample indicates that a distinct plastic deformation mechanism is operating in the nanocrystalline sample. The positron lifetime results confirm indirectly that the mechanism is grain boundary based, such as grain boundary sliding. Once the nanocrystalline sample is annealed at high temperature, the changes in the thickness reduction and the positron lifetime results become similar to those of the conventional bulk sample. Furthermore, vacancy clusters inside the nanocrystalline sample are found to be an impediment to the plastic deformation process.
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