Analysis of crystallographic slip and grain boundary sliding in a Ti-45Al-2Nb-2Mn (at%)-0.8 vol%TiB2 alloy by high temperature in situ mechanical testing

Muñoz Moreno, Rocío; Ruiz Navas, Elisa María; Boehlert, Carl; Llorca Martinez, Francisco Javier; Torralba, J. M y Pérez Prado, María Teresa (2014). Analysis of crystallographic slip and grain boundary sliding in a Ti-45Al-2Nb-2Mn (at%)-0.8 vol%TiB2 alloy by high temperature in situ mechanical testing. "Materials Science and Engineering: A", v. 606 ; pp. 276-289. ISSN 0921-5093.

Descripción

Título: Analysis of crystallographic slip and grain boundary sliding in a Ti-45Al-2Nb-2Mn (at%)-0.8 vol%TiB2 alloy by high temperature in situ mechanical testing
Autor/es:
  • Muñoz Moreno, Rocío
  • Ruiz Navas, Elisa María
  • Boehlert, Carl
  • Llorca Martinez, Francisco Javier
  • Torralba, J. M
  • Pérez Prado, María Teresa
Tipo de Documento: Artículo
Título de Revista/Publicación: Materials Science and Engineering: A
Fecha: 12 Junio 2014
Volumen: 606
Materias:
Palabras Clave Informales: In situ testing; EBSD; TiAl; Crystallographic slip; Grain boundary sliding; Schmid law
Escuela: E.T.S.I. Caminos, Canales y Puertos (UPM)
Departamento: Ciencia de los Materiales
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

This work aims to contribute to a further understanding of the fundamentals of crystallographic slip and grain boundary sliding in the γ-TiAl Ti–45Al–2Nb–2Mn (at%)–0.8 vol%TiB2 intermetallic alloy, by means of in situ high-temperature tensile testing combined with electron backscatter diffraction (EBSD). Several microstructures, containing different fractions and sizes of lamellar colonies and equiaxed γ-grains, were fabricated by either centrifugal casting or powder metallurgy, followed by heat treatment at 1300 °C and furnace cooling. in situ tensile and tensile-creep experiments were performed in a scanning electron microscope (SEM) at temperatures ranging from 580 °C to 700 °C. EBSD was carried out in selected regions before and after straining. Our results suggest that, during constant strain rate tests, true twin γ/γ interfaces are the weakest barriers to dislocations and, thus, that the relevant length scale might be influenced by the distance between non-true twin boundaries. Under creep conditions both grain/colony boundary sliding (G/CBS) and crystallographic slip are observed to contribute to deformation. The incidence of boundary sliding is particularly high in γ grains of duplex microstructures. The slip activity during creep deformation in different microstructures was evaluated by trace analysis. Special emphasis was placed in distinguishing the compliance of different slip events with the Schmid law with respect to the applied stress.

Más información

ID de Registro: 35456
Identificador DC: http://oa.upm.es/35456/
Identificador OAI: oai:oa.upm.es:35456
Depositado por: Memoria Investigacion
Depositado el: 09 Jun 2015 12:01
Ultima Modificación: 12 Jun 2016 22:30
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