Deformation mechanism of the (β + α”) dual-phase Ti-42Zr-13Nb alloy exhibiting an abnormal work-hardening behavior

T. Yin, Z. W. Zhu, J. Mu, J. Wang, R. G. Li, Y. Ren, Y. D. Wang, Y. Li

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In-situ high-energy X-ray diffraction combined with post-mortem transmission electron microscopy was used to reveal the deformation mechanism of the (β + α”) dual-phase Ti-42Zr-13Nb (wt.%) alloy exhibiting a two-stage yielding behavior under tension. It is found that the first yielding stage is dominated by two processes, i.e., the reorientation of pre-existing α” phase via variant selection and the preferential induction of α” variants during martensitic transformation. These two processes make the {020}α” plane perpendicular to the loading direction (LD) and lead to an abnormal increase in the work-hardening rate at 0.036–0.082 strain. When the strain exceeds 0.082, the stress-induced martensitic transformation ceases and the reorientation of pre-existing α” phase gradually weakens, resulting in a continuous decrease in the work-hardening rate. Moreover, the second yielding stage is dominated by the reorientation of stress-induced α” martensite, which tends to reorient the plane perpendicular to LD from {020}α to {110}α”. Our investigation provides new insights into the reorientation scenarios of both pre-existing and stress-induced α” phases, as well as the underlying physical mechanism responsible for the abnormal work-hardening behavior in Ti-based shape memory alloys.

Original languageEnglish
Article number113166
JournalMaterials Characterization
Volume204
DOIs
StatePublished - Oct 2023
Externally publishedYes

Keywords

  • Dual-phase Ti alloy
  • High-energy X-ray diffraction
  • Martensitic transformation
  • Reorientation
  • Work-hardening rate

Fingerprint

Dive into the research topics of 'Deformation mechanism of the (β + α”) dual-phase Ti-42Zr-13Nb alloy exhibiting an abnormal work-hardening behavior'. Together they form a unique fingerprint.

Cite this