Recovery of scratch grooves in Ti-6Al-4V alloy caused by reversible phase transformations

Artur R. Shugurov, Alexey V. Panin, Andrey I. Dmitriev, Anton Yu Nikonov

Research output: Contribution to journalArticlepeer-review

Abstract

The deformation behaviors of Ti-6Al-4V alloy samples with lamellar and bimodal microstructures under scratch testing were studied experimentally and using molecular dynamics simulation. It was found that the scratch depth in the sample with a bimodal microstructure was twice as shallow as that measured in the sample with a lamellar microstructure. This effect is attributed to the higher hardness of the sample with a bimodal microstructure and the larger amount of elastic recovery of scratch grooves in this sample. On the basis of the results of molecular dynamics simulation, a mechanism was proposed, which associates the recovery of the scratch grooves with the inhomogeneous vanadium distribution in the β-areas. The calculations showed that at a vanadium content typical for Ti-6Al-4V alloy, both the body-centered cubic (BCC) and hexagonal close-packed (HCP) structures can be more energetically favorable depending on the atomic volume. Therefore, compressive or tensile stresses induced by the indenter could facilitate β→α and α→β phase transformations, respectively, in the vanadium-depleted domains of the β-areas, which contribute to the recovery of the Ti-6Al-4V alloy subjected to scratching.

Original languageEnglish
Article number1332
Pages (from-to)1-14
Number of pages14
JournalMetals
Volume10
Issue number10
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Microstructure
  • Molecular dynamics
  • Phase transformations
  • Scratch testing
  • Ti-6Al-4V

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint Dive into the research topics of 'Recovery of scratch grooves in Ti-6Al-4V alloy caused by reversible phase transformations'. Together they form a unique fingerprint.

Cite this