Crystal Plasticity Analysis of Microscopic Deformation Mechanisms and GN Dislocation Accumulation Depending on Vanadium Content in β Phase of Two-Phase Ti Alloy

• Kawano Yoshiki

  Department of Mechanical Engineering, Kitami Institute of Technology

• Ohashi Tetsuya

  Department of Mechanical Engineering, Kitami Institute of Technology

• Mayama Tsuyoshi

  Department of Materials Science and Engineering, Faculty of Engineering, Kumamoto University

• Mitsuhara Masatoshi

  Department of Advanced Materials Science and Engineering, Faculty of Engineering Sciences, Kyushu University

• Okuyama Yelm

  Department of Mechanical Engineering, Faculty of Engineering, Kyushu University

• Sato Michihiro

  Department of Mechanical Engineering, Kitami Institute of Technology

Abstract

Inhomogeneous deformation of a single α-β colony in a Ti–6Al–4V 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 β phase (V_β). 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_β induced greater stress in the α phase and smaller stress in the β phase close to the α-β interfaces in the initial stages of deformation because of the elastically softer β phase with lower V_β. This resulted in greater strain gradients and greater GND density close to the interfaces in the initial stages of deformation within the single α-β colony when the β phase plastically does not deform.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 60 (6), 959-968, 2019-06-01

  The Japan Institute of Metals and Materials

Keywords

• single α-β colony
• Ti–6Al–4V
• crystal plasticity analysis
• geometrically necessary dislocations
• chemical composition in β phase
• elastic constants
• inhomogeneous deformation

Details

• CRID: 1390001288139453440
• NII Article ID: 130007653194
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.m2019016
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 029707250
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I029707250
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/60/6/60_M2019016/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed