Residual stresses and microstructural evolution of ECAPed AA2017
Por:
Romero-Resendiz L., Figueroa I.A., Reyes-Ruiz C., Cabrera J.M., Braham C., Gonzalez G.
Publicada:
1 ene 2019
Resumen:
The mechanical behavior and microstructural evolution of an AA2017 aluminum alloy processed by ECAP with an equivalent simple shear deformation of ~6 at 200 °C were studied. Samples were characterized by means of scanning electron microscopy (SEM-EDS- EBSD), image-assisted by focus ion beam (FIB), Vickers microhardness and X-ray diffraction (XRD) techniques. During the deformation process, the Al 2 Cu precipitates did not get fragmented or re-absorbed in the Al matrix. After the first ECAP pass, at least 50% of grains displayed an ultrafine size. The EBSD analysis showed an increment of the misorientation angle immediately after the first ECAP pass. The macrotexture evolution was explained in terms of the formation of f1: A 1? * , A ? , A ? , A 2? * , f2: C ? , B¯ ? , B ? , A ? , A ? , A 1? * and f3: C ? , B ? , B¯ ? , A ? , A ? , A 2? * fibers. The macro-residual stress measurements of the highly deformed samples showed linear sin 2 ? profiles. The micro and macro-residual stresses were compatible with dislocation rearrangement, in which the annihilation and formation were in quasi-equilibrium. It was found that the highest microhardness value (1176 MPa) and grain refinement (at least 20% of grains showed a size smaller than 100 µm 2 ) appeared after the first extrusion pass. The decrease in hardness, after the second pass and the residual stress stability, could be associated to a dynamic recovery phenomenon. © 2019
Filiaciones:
Romero-Resendiz L.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito exterior S/N, Cd. Universitaria, A.P. 70-360, Coyoacán, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Circuito Exterior S-N,Cd Univ,AP 70-360, Coyoacan 04510, Mexico
Figueroa I.A.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito exterior S/N, Cd. Universitaria, A.P. 70-360, Coyoacán, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Circuito Exterior S-N,Cd Univ,AP 70-360, Coyoacan 04510, Mexico
Reyes-Ruiz C.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito exterior S/N, Cd. Universitaria, A.P. 70-360, Coyoacán, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Circuito Exterior S-N,Cd Univ,AP 70-360, Coyoacan 04510, Mexico
Cabrera J.M.:
Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, ETSEIB – Universidad Politécnica de Cataluña, Eduard Maristany 10-14, Barcelona, 08019, Spain
Univ Politecn Cataluna, ETSEIB, Dept Ciencia Mat & Ingn Met, Eduard Maristany 10-14, Barcelona 08019, Spain
Braham C.:
PIMM, UMR CNRS 8006, ENSAM, 151, boulevard de L'Hôpital, Paris, 75013, France
ENSAM, UMR CNRS 8006, PIMM, 151 Blvd Hop, F-75013 Paris, France
Gonzalez G.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito exterior S/N, Cd. Universitaria, A.P. 70-360, Coyoacán, 04510, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Circuito Exterior S-N,Cd Univ,AP 70-360, Coyoacan 04510, Mexico
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