Abstract
Dislocation loops emitted by Frank-Reed source during crossing dislocations of the non-coplanar slip systems are accumulates jogs on the own dislocation line, resulting in the deceleration of the segments of dislocation loops with high jog density. As a result, bending around of the slowed segments the formation of dynamic dipoles in the shear zone occurs. In the present paper we consider formation mechanism of non-misoriented dislocation cell substructure during plastic deformation of f.c.c. metals and conclude that the increase in the degree heterogeneity of dislocation distribution leads to an increase in the jog density and reduce the mean value of arm dynamic dipoles.
Highlights
Non-misoriented dislocation cell substructure (NMDCS) was the first experimentally observed dislocation structure [1] and attracted the attention of researches due to its contribution to the strengthening of the material [2 – 4]
According to the modern concept of cell structures, non-misoriented dislocation cell substructures assumed as heterogeneous substructure, dislocations of which mostly located in the walls of finite thickness, consisting of dipoles and multipoles hindering movement of shear-forming dislocations [4]
Mathematical models of plastic deformation include NMDCS characteristics as an equation parameters, such as the average value of the dipole arm hd, the mean free path d of a screw dislocation with jogs and the average shear zone area S D, i.e. the average area swept out by shearforming dislocations emitted by Frank-Read sources
Summary
Series: Materials Science and Engineering 135 (2016) 012007 doi:10.1088/1757-899X/135/1/012007. The influence of the dislocation distribution heterogeneity degree on the formation of a non-misoriented dislocation cell substructures in f.c.c. metals. D N Cherepanov, O V Selivanikova and M V Matveev1 1National Research Tomsk Polytechnic University, Tomsk, Russia 2Tomsk State University of Architecture and Building, Tomsk, Russia
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