Atomistic modeling of dislocation interactions with twin boundaries in Ti

被引：27
|
作者：
Hooshmand, M. S. [1 ]
Mills, M. J. [1 ]
Ghazisaeidi, M. [1 ]
机构：
[1] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA
来源：
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING | 2017年 / 25卷 / 04期
关键词：
dislocation/boundary interaction; atomistic modeling; titanium; CLOSE-PACKED METALS; HCP METALS; GRAIN-BOUNDARIES; INTERFACIAL STRUCTURE; COMPUTER-SIMULATION; DEFORMATION; TITANIUM; NUCLEATION; MOBILITY; MODES;
D O I：
10.1088/1361-651X/aa6323
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Dislocation/ boundary interactions play a prominent role in mechanical properties and plastic deformation of materials. We study the interaction between prismatic screw a , prismatic edge c and pyramidal mixed c+ a dislocations with ( 1011) and (1013) twin boundaries in titanium using atomistic simulations. Details of the dislocation reactions depend on the slip system, atomic structure of boundary and stress/ strain states. All interactions lead to nucleation of twinning dislocations on both twin boundaries, confirming that the interaction with incoming dislocations is a twin growth mechanism. In addition, dissociation of c and c+ a . dislocations on the (1013) results in nucleation of a (1012) ( tension twin) embryo in the second grain- a new twin nucleation mechanism for (1012) twins as a result of c and c + a slip.
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页数：20
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