TY - JOUR
T1 - Crystal plasticity analysis of microscopic deformation mechanisms and GN dislocation accumulation depending on vanadium content in ¢ phase of two-phase Ti alloy
AU - Kawano, Yoshiki
AU - Ohashi, Tetsuya
AU - Mayama, Tsuyoshi
AU - Mitsuhara, Masatoshi
AU - Okuyama, Yelm
AU - Sato, Michihiro
N1 - Funding Information:
This work was partly supported by the Council for Science, Technology and Innovation (CSTI), the Cross-ministerial Strategic Innovation Promotion Program (SIP), “Fundamental Research Focusing on Interface for Overcoming Unsolved Issues in Structural Materials” (Founding agency: JST). This work was also supported by the Amada Foundation.
Publisher Copyright:
© 2019 The Japan Institute of Metals and Materials
PY - 2019
Y1 - 2019
N2 - Inhomogeneous deformation of a single ¡-¢ colony in a Ti6Al4V alloy under uniaxial tensile conditions was numerically simulated using a crystal plasticity finite element (CPFE) method, and we predicted density changes in geometrically necessary dislocations (GNDs) depending on the vanadium concentration in the ¢ phase (V¢). The geometric model for the CPFE analysis was obtained by converting data from electron back-scatter diffraction patterns into data for the geometric model for CPFE analysis, using a data conversion procedure previously developed by the authors. The results of the image-based crystal plasticity analysis indicated that smaller V¢ induced greater stress in the ¡ phase and smaller stress in the ¢ phase close to the ¡-¢ interfaces in the initial stages of deformation because of the elastically softer ¢ phase with lower V¢. This resulted in greater strain gradients and greater GND density close to the interfaces in the initial stages of deformation within the single ¡-¢ colony when the ¢ phase plastically does not deform.
AB - Inhomogeneous deformation of a single ¡-¢ colony in a Ti6Al4V alloy under uniaxial tensile conditions was numerically simulated using a crystal plasticity finite element (CPFE) method, and we predicted density changes in geometrically necessary dislocations (GNDs) depending on the vanadium concentration in the ¢ phase (V¢). The geometric model for the CPFE analysis was obtained by converting data from electron back-scatter diffraction patterns into data for the geometric model for CPFE analysis, using a data conversion procedure previously developed by the authors. The results of the image-based crystal plasticity analysis indicated that smaller V¢ induced greater stress in the ¡ phase and smaller stress in the ¢ phase close to the ¡-¢ interfaces in the initial stages of deformation because of the elastically softer ¢ phase with lower V¢. This resulted in greater strain gradients and greater GND density close to the interfaces in the initial stages of deformation within the single ¡-¢ colony when the ¢ phase plastically does not deform.
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U2 - 10.2320/matertrans.M2019016
DO - 10.2320/matertrans.M2019016
M3 - Article
AN - SCOPUS:85066124651
SN - 1345-9678
VL - 60
SP - 959
EP - 968
JO - Materials Transactions
JF - Materials Transactions
IS - 6
ER -