Theory of dislocation-solute atom interactions in solid solutions and related nonlinear anelasticity

被引:32
作者
Gremaud, G [1 ]
Kustov, S
机构
[1] Ecole Polytech Fed Lausanne, Inst Genie Atom, CH-1015 Lausanne, Switzerland
[2] AF Ioffe Physicotech Inst, St Petersburg 194021, Russia
来源
PHYSICAL REVIEW B | 1999年 / 60卷 / 13期
关键词
D O I
10.1103/PhysRevB.60.9353
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A theory for dislocation-solute atom interactions in solid solutions has been developed which allows one to calculate the nonlinear dislocation strain-amplitude-dependent internal friction. The suggested model accounts for different modes of dislocation-solute atom interactions: (i) Solute atoms distributed in the dislocation glide plane interact with the dislocation core and represent short-range obstacles for the dislocation motion; (ii) Solute atoms situated away from the dislocation glide plane create relatively weak long-range elastic stress fields, also impeding dislocation motion. We assume that dislocations move in a two-component system of obstacles which differ with respect to the thermodynamics of dislocation-point-defect interactions. Namely, dislocations overcome short-range obstacles under the combined action of applied stress and thermal energy, whereas relatively weak long-range obstacles are surmounted athermally. The model predicts a complicated multistage behavior of the nonlinear internal friction in the strain amplitude-temperature-solute concentration domain, which is in excellent agreement with recent experimental data.
引用
收藏
页码:9353 / 9364
页数:12
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