Publication: Efecto de la extrusión angular en las propiedades mecánicas del Ti reforzado con partículas de Itria
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2009-03
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S.E.I.E. Grupo Español de Fractura
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Abstract
Se ha investigado la mejora de las propiedades mecánicas del Ti reforzado con una dispersión de partículas de Y₂O₃. Se
han preparado muestras de Ti y Ti-0,6wt%Y₂O₃ mediante sinterizado seguido de HIP. Los materiales se han sometido a
extrusión angular con sección constante (ECAP) con el fin de refinar su microestructura y mejorar sus propiedades
mecánicas. Se han estudiado la microestructura mediante microscopía óptica y electrónica y el comportamiento
mecánico a partir de ensayos de tracción entre 295 y 773 K. La extrusión angular induce una mejora cualitativa de las
propiedades mecánicas del Ti-0,6Y₂O₃. Este material, que es completamente frágil a T ≤ 473 K, adquiere una buena
ductilidad a esta temperatura después de la 1ª pasada de ECAP. Cuando el material se somete a 4 pasadas, puede
adquirir a 373 K resistencias mecánicas de 986 MPa y alcanzar deformaciones de fractura del orden del 23 %.
Ti and Ti-0.6wt%Y₂O₃ were produced by sintering and subsequent hot isostatic pressing (HIP). Samples of these materials were processed by equal channel angular pressing (ECAP) to induce their microstructural refinement and improvement of their mechanical properties. The microstructural characteristics and the mechanical behavior of these materials have been investigated using techniques of microscopy, and tensile tests in the temperature range 295 – 773 K. The ECAP treatment induces a qualitative improvement of the mechanical properties of P/M Ti-0.6wt%Y₂O₃. This material in as-HIP condition is completely brittle at T≤ 473 K but becomes ductile at this temperature after a single ECAP pass. After being processed by 4 passes via route BA the material can attain a tensile strength as high as 986 MPa with a fracture strain of 23 %.
Ti and Ti-0.6wt%Y₂O₃ were produced by sintering and subsequent hot isostatic pressing (HIP). Samples of these materials were processed by equal channel angular pressing (ECAP) to induce their microstructural refinement and improvement of their mechanical properties. The microstructural characteristics and the mechanical behavior of these materials have been investigated using techniques of microscopy, and tensile tests in the temperature range 295 – 773 K. The ECAP treatment induces a qualitative improvement of the mechanical properties of P/M Ti-0.6wt%Y₂O₃. This material in as-HIP condition is completely brittle at T≤ 473 K but becomes ductile at this temperature after a single ECAP pass. After being processed by 4 passes via route BA the material can attain a tensile strength as high as 986 MPa with a fracture strain of 23 %.
Description
Comunicaciones presentadas en: XXVI Encuentro del grupo Español de Fractura,Santander, 25 marzo 2009.
Keywords
Titanio reforzado, Pulvimetalurgia, ECAP
Bibliographic citation
Anales de Mecánica de la Fractura 26 (2009), pp.130-135