Texture evolution of AZ31 magnesium alloy sheet at high strain rates

  1. Ulacia Garmendia, Ibai 1
  2. Yi, S. 3
  3. Pérez Prado, M. T. 2
  4. Dudamell, N. V. 2
  5. Gálvez, F. 4
  6. Letzig, D. 3
  7. Hurtado Hurtado, José Ignacio 1
  1. 1 Mondragon Goi Eskola Politeknikoa, Mondragon Unibertsitatea, 20500 Mondragon, Spain
  2. 2 Madrid Institute for Advanced Studies in Materials, IMDEA Materials, 28040 Madrid, Spain
  3. 3 GKSS Research Center, 21502 Geesthacht, Germany
  4. 4 ETS Ingenieros de Caminos, Universidad Politécnica de Madrid, 28040 Madrid, Spain
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Actas:
4th International Conference on High Speed Forming

Año de publicación: 2010

Páginas: 9

Tipo: Aportación congreso

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Resumen

In the current contribution the mechanical behaviour at high strain rates of AZ31 magnesium alloy sheet is studied. Uniaxial deformation properties were studied by meansof tensile split Hopkinson pressure bar (SHPB) at different temperatures. The influence of the strain rate and temperature on the deformation mechanisms was investigated by means of electron backscatter diffraction (EBSD) and neutron diffraction. It is shown that twinning plays an important role on high strain rate deformation of this alloy, even at elevated temperatures. Significant evidence of prismatic slip as a deformation mechanism is observed, also at warm temperatures, leading to the alignment of <10-10> directions with the tensile axis and to a spread of the intensities of the basal pole figure towards the in-plane direction perpendicular to the tensile axis. The rate of decrease of the CRSS of non-basal systems is observed to be slower than at quasi-static rates. Secondary twinning and pyramidal <c+a> slip were also outlined for some conditions. At warm temperatures, in contrast to quasi-static range, a generalized dynamic recrystallization is not observed. Moreover, the activation of rotational recrystallization mechanisms is reported.