Inverse hall-petch relationship in nanocrystalline tantalum

• Autores: Tang, Yizhe; Bringa, Eduardo Marcial; Meyers, Marc A.
• Año de publicación: 2013
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: BCC METAL; GRAIN-SIZE EFFECT; INVERSE HALL-PETCH RELATIONSHIP; MOLECULAR DYNAMICS
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Tantalum polycrystals (grain sizes varying from 2.5 to 30 nm) generated by Voronoi tessellation were subjected to tension and compression under uniaxial strain loading at strain rates on the order of 108–109 s−1 using molecular dynamics (MD) simulations. In contrast with MD simulations of FCC metals, the response in tension is significantly different from that in compression. In tension, fracture is initiated at grain boundaries perpendicular to the loading direction. It propagates along grain boundaries with limited plastic deformation, at a stress in the range 10–14 GPa. This brittle intergranular failure is a consequence of the high strain rate imposed by MD, leading to a stress that exceeds the grain-boundary cohesive strength. Thus, grain-boundary separation is the principal failure mechanism. In compression, on the other hand, there is considerable plastic deformation within the grains. This occurs at stresses higher than failure in tension. The difference between tensile and compressive response for tantalum is attributed to the difficulty in generating dislocations, in contrast with FCC metals, where tensile failure occurs by void nucleation at grain boundaries associated with partial and perfect dislocation emission. In BCC tantalum, both grain-boundary sliding and dislocation emission are much more difficult. The compressive yield stress is found to increase with grain size in the 2.5 nmThe compressive yield stress is found to increase with grain size in the 2.5 nmFil: Tang, Yizhe. University Of California At San Diego; Estados Unidos;
Fil: Bringa, Eduardo Marcial. Universidad Nacional de Cuyo. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mendoza; Argentina
Fil: Meyers, Marc A.. University Of California At San Diego; Estados Unidos;