Ti-6Al-4V 合金における室温クリープ中の転位の運動様式と変形組織の発達過程

Translated title of the contribution: Dislocation motion and microstructure evolution deformed during creep at room temperature in Ti-6Al-4V alloy

Research output: Contribution to journalArticlepeer-review

Abstract

The deformation behavior and microstructure evolution of Ti-6Al-4V alloy under room temperature creep was investigated using mechanical test and scanning electron microscope observation with electron back-scatter diffraction method. The alloys were creep deformed and ruptured under initial stresses of 874 MPa, 889 MPa and 904 MPa at room temperature. The rapid stress change test revealed that creep deformation was controlled by the viscous slip motion of dislocations. The stress exponent was estimated as 59. The strain rate of acceleration creep region calculated by the Norton's law with the high stress exponent was inconsistent with that measured by the experimental creep test. Using the slip trace analysis, it was found that single dislocation slip in basal and prism were mainly activated in the early stage of creep, and multiple slips were often observed as the deformation progresses. Especially, the multiple slip including 1st pyramidal slip believed to be effective for suppressing strain rate acceleration in creep. In addition, the work hardening behavior during creep showed a strain rate dependence, indicating that the lower the strain rate is, the more work hardening occurs.

Translated title of the contributionDislocation motion and microstructure evolution deformed during creep at room temperature in Ti-6Al-4V alloy
Original languageJapanese
Pages (from-to)405-414
Number of pages10
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume70
Issue number8
DOIs
Publication statusPublished - Oct 2020

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this