Structure, phase composition and mechanical propertiesin bioinert zirconium-based alloy after severe plastic deformation

A. Yu Eroshenko, A. M. Mairambekova, Yu P. Sharkeev, Zh G. Kovalevskaya, M. A. Khimich, P. V. Uvarkin

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Bioinert Zr-1Nb alloy, which is a prospective material for the fabrication of implants for different applications, is studied. Annealed billets of the alloys are subjected to severe plastic deformation including multi-cycle abc-pressing and multipass rolling in grooved rolls. The abc-pressing stage involves three cycles of pressing within the temperature range 500 – 400°C with one pressing in each cycle at a given temperature. In the second stage, the billets are deformed through rolling in grooved rolls at room temperature. Rolling in grooved rolls provided the formation of a homogeneous structure throughout the bulk billet volume and additional grain refinement. After annealing the alloy had a fine-grained structure consisting of 2.8 μm sized equiaxial α-Zr matrix grains and 0.4 μm sized β-Nb particles distributed on the boundaries and interiors of α-Zr matrix grains. As a result of severe plastic deformation, a binary ultrafine-grained alloy with 0.2 μm size of structural elements was obtained. Transmission electron microscopy shows that the microstructure of the alloy consists of α-Zr grains, while β-Nb phase grains are not identified structurally or via X-ray diffraction. Only the diffraction identification analysis reveals the presence of β-Nb in the alloy. Ultrafine-grained structure enhances the mechanical properties of the alloys: yield stress 450 MPa, ultimate tensile strength 780 MPa, and microhardness 2800 MPa are obtained while keeping a low value of Young's modulus (51 MPa) comparable to the Young’s modulus of bone tissue.

Original languageEnglish
Pages (from-to)469-472
Number of pages4
JournalLetters on Materials
Volume7
Issue number4
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • Severe plastic deformation
  • Ultrafine-grained structure
  • Young's modulus
  • Zr-1Nb alloy

ASJC Scopus subject areas

  • Materials Science(all)

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