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 and Ruiz Navas, Elisa María and Boehlert, Carl and Llorca Martinez, Francisco Javier and Torralba, J. M and 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. https://doi.org/10.1016/j.msea.2014.03.078.

Description

Title: 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
Author/s:
  • Muñoz Moreno, Rocío
  • Ruiz Navas, Elisa María
  • Boehlert, Carl
  • Llorca Martinez, Francisco Javier
  • Torralba, J. M
  • Pérez Prado, María Teresa
Item Type: Article
Título de Revista/Publicación: Materials Science and Engineering: A
Date: 12 June 2014
ISSN: 0921-5093
Volume: 606
Subjects:
Freetext Keywords: In situ testing; EBSD; TiAl; Crystallographic slip; Grain boundary sliding; Schmid law
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainMAT2009-14547-C02-01UnspecifiedUnspecifiedUnspecified
Government of SpainMAT2009-14547-C02-02UnspecifiedUnspecifiedUnspecified
Madrid Regional GovernmentP2009/MAT-1585UnspecifiedUnspecifiedUnspecified
Government of SpainMAT2012-31889UnspecifiedUnspecifiedUnspecified

More information

Item ID: 35456
DC Identifier: http://oa.upm.es/35456/
OAI Identifier: oai:oa.upm.es:35456
DOI: 10.1016/j.msea.2014.03.078
Official URL: http://www.sciencedirect.com/science/article/pii/S0921509314003608
Deposited by: Memoria Investigacion
Deposited on: 09 Jun 2015 12:01
Last Modified: 16 May 2019 07:25
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