Dynamic interaction between grain boundary and stacking fault tetrahedron
نویسندگان
چکیده
منابع مشابه
Š110‹ symmetric tilt grain-boundary structures in fcc metals with low stacking-fault energies
Twenty-one ^110& symmetric tilt grain boundaries ~GB’s! are investigated with atomistic simulations, using an embedded-atom method ~EAM! potential for a low stacking-fault energy fcc metal. Lattice statics simulations with a large number of initial configurations are used to identify both the equilibrium and metastable structures at 0 K. The level of difficulty in finding the equilibrium struct...
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A range of ^110& symmetric tilt grain boundaries ~GB’s! are investigated in several fcc metals with simulations and high-resolution electron microscopy. Boundaries with tilt angles between 50.5° and 109.5° dissociate into two boundaries 0.6 to 1.1 nm apart. The dissociation takes place by the emission of stacking faults from one boundary that are terminated by Shockley partials at a second boun...
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The problem o f t h e i n t e r a c t i o n o f d i s loca t ions w i t h g r a i n boundaries i s d i s cussed on t h e bas is o f t h e concept o f g r a i n boundary non-equi l ibr ium s t a t e generat ion and recovery. According t o t h i s concept, trapped l a t t i c e d is loca t ions , being non-equil i b r i u m defects , are absorbed by t h e boundaries as they d issoc ia te i n t o ...
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When load is applied to fcc nanograins, leading partial dislocations nucleate at grain boundary steps and propagate into the grain, leaving stacking faults behind. The extent to which these faults expand before a trailing partial is emitted generally does not equal the equilibrium separation distance of the corresponding full dislocation. Here we use a density functional theory – phase field di...
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The dynamic behavior of three high manganese steels with very different stacking faultenergy (SFE) values (4-30 mJ/m2) were studied using high strain rate torsional tests. The hotrolledmicrostructure of the steel with the lowest SFE of 4 mJ/m2 consisted of a duplex mixture ofaustenite and ε-martensite, but those of the other two steels were fully austenitic. The deformedmicrostructures were stu...
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ژورنال
عنوان ژورنال: Scripta Materialia
سال: 2018
ISSN: 1359-6462
DOI: 10.1016/j.scriptamat.2017.09.027