Strange behavior of dislocations of a certain type: Self-locking
- 作者: Greenberg B.1, Ivanov M.2
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隶属关系:
- Institute of Metal Physics, Ural Branch
- Kurdjumov Institute of Physical Metallurgy
- 期: 卷 2016, 编号 4 (2016)
- 页面: 266-285
- 栏目: Physical Foundations of Strength and Plasticity
- URL: https://journals.rcsi.science/0036-0295/article/view/170430
- DOI: https://doi.org/10.1134/S0036029516040091
- ID: 170430
如何引用文章
详细
The results of studying the self-locking of dislocations, namely, the transformation of glissile dislocations into blocked dislocations in the absence of an applied stress, are generalized. The existence of selflocking is theoretically grounded and experimentally proved via the observation of dislocation extension along a preferred direction upon loading-free heating after preliminary plastic deformation. The following concept is developed to explain the experimental results: an effective force appears in the case of a two-valley dislocation potential relief; it is proportional to the difference between the valley depths and causes the transformation of a dislocation into an indestructible barrier. The temperature anomaly of yield strength and the dislocation self-locking are shown to have the same nature—a two-valley dislocation potential relief. Both effects were observed in Ni3Al- and TiAl-type intermetallics and a pure metal (magnesium).
作者简介
B. Greenberg
Institute of Metal Physics, Ural Branch
编辑信件的主要联系方式.
Email: bella@imp.uran.ru
俄罗斯联邦, ul. S. Kovalevskoi 18, Yekaterinburg, 620990
M. Ivanov
Kurdjumov Institute of Physical Metallurgy
Email: bella@imp.uran.ru
乌克兰, bul’v. Akad. Vernadskogo 36, Kiev, 03680